Peregrine Pharmaceuticals Inc (PPHM) SEC Annual Report (10-K) for 2013

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

________________________

FORM 10-K

(Mark One)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended April 30, 2013

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______________to _______________

Commission file number: 001-32839

PEREGRINE PHARMACEUTICALS, INC.

(Exact name of Registrant as specified in its charter)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes   o    No   x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes   o    No   x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.   Yes x     No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).   Yes x     No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes   o   No   x

The aggregate market value of voting and non-voting common stock held by non-affiliates as of October 31, 2012 was $100,013,745.

Number of shares of common stock outstanding as of July 5, 2013: 151,602,765

DOCUMENTS INCORPORATED BY REFERENCE

Part III of this report incorporates certain information by reference from the registrant's proxy statement for the annual meeting of stockholders, which proxy statement will be filed no later than 120 days after the close of the registrant's fiscal year ended April 30, 2013.

PEREGRINE PHARMACEUTICALS, INC.

Fiscal Year 2013

Annual Report on Form 10-K

Table of Contents

PART I

In this Annual Report, unless the context otherwise indicates, the terms "we", "us", "our", "Company" and "Peregrine" refer to Peregrine Pharmaceuticals, Inc., and our wholly owned subsidiary, Avid Bioservices, Inc ("Avid"). This Annual Report contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), that involve risks and uncertainties. The inclusion of forward-looking statements should not be regarded as a representation by us or any other person that the objectives or plans will be achieved because our actual results may differ materially from any forward-looking statement. The words "may," "should," "plans," "believe," "anticipate," "estimate," "expect," their opposites and similar expressions are intended to identify forward-looking statements, but the absence of these words does not necessarily mean that a statement is not forward-looking. We caution readers that such statements are not guarantees of future performance or events and are subject to a number of factors that may tend to influence the accuracy of the statements, including but not limited to, those risk factors outlined in the section titled "Risk Factors" as well as those discussed elsewhere in this Annual Report. You should not duly rely on these forward-looking statements, which speak only as of the date of this Annual Report. We undertake no obligation to publicly revise any forward-looking statement to reflect circumstances or events after the date of this Annual Report or to reflect the occurrence of unanticipated events. You should, however, review the factors and risks we describe in the reports that we file from time to time with the Securities and Exchange Commission ("SEC") after the date of this Annual Report.

Our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and all amendments to those reports filed with or furnished to the SEC are available, free of charge, through our website at www.peregrineinc.com as soon as reasonably practicable after such reports are electronically filed with or furnished to the SEC. The information on, or that can be accessed through, our website is not part of this Annual Report.

Certain technical terms used in the following description of our business are defined in the "Glossary of Terms."

We own or have rights to the registered trademarks Cotara ® and Avid Bioservices ® . All other company names, registered trademarks, trademarks and service marks included in this Annual Report are trademarks, registered trademarks, service marks or trade names of their respective owners.

Overview

Peregrine is a biopharmaceutical company with a portfolio of innovative monoclonal antibodies in clinical trials for the treatment and diagnosis of cancer. We have two targeting platforms and are pursuing multiple clinical programs in cancer with our lead immunotherapy candidate bavituximab, our lead PS-targeting agent, 124I-PGN650 ("PGN650"), and our novel brain cancer therapy Cotara ® . Our primary goals for the PS-targeting platform are to advance bavituximab into a pivotal Phase III clinical trial by calendar year-end of 2013, continue to explore the broader immunotherapeutic applications of bavituximab in the treatment of cancer, and to explore the broader potential uses of the phosphatidylserine ("PS")-targeting technology platform.

Our goals for the coming fiscal year include:

Peregrine's new class of PS-targeting therapeutics are monoclonal antibodies that target and bind to PS, a highly immunosuppressive molecule usually located inside the membrane of healthy cells, but "flips" and becomes exposed on the outside of cells that line tumor blood vessels, causing the tumor to evade immune detection. Bavituximab is our lead therapeutic PS-targeting antibody, which has demonstrated broad therapeutic potential and represents a new approach to treating cancer. PGN650 is our lead PS-targeting imaging agent that represents a potential new approach to imaging cancer. Bavituximab targets PS and works by activating the immune system causing the maturation of cancer-fighting (M1) macrophages and the development of cytotoxic T-cells that fight solid tumors.

We have conducted three randomized Phase II trials for bavituximab in combination with standard chemotherapy in both front and second-line NSCLC as well as front-line pancreatic cancer. In addition, we have four ongoing ISTs evaluating bavituximab with additional drug combinations in additional oncology indications. From these randomized Phase II clinical trials and ISTs conducted to date, we have identified bavituixmab plus docetaxel in second-line NSCLC as our lead indication for bavituximab based on:

In May 2013, we reached agreement with the FDA on a Phase III registration trial design in second-line NSCLC with bavituximab and docetaxel. We plan to initiate this trial by calendar year-end 2013. In addition, in June 2013, we conducted a comprehensive review of the bavituximab oncology program with the goal of adapting the clinical development plan in accordance with the recent increased understanding of the immune-stimulatory properties of bavituximab. We believe that several of the ongoing clinical trials could corroborate bavituximab's immunotherapy mechanism of action in the clinic as they include patient sample collection for immune correlative testing. We are also actively working with our clinical collaborators on how best to design future trials evaluating the potential of combining bavituximab with other immunotherapy agents in addition to the chemotherapy combinations that are currently underway.

PGN650 is our lead PS-targeting molecular imaging agent that represents a potential new approach to imaging cancer. We initiated clinical development for PGN650 in 2012 under an exploratory Investigational New Drug ("IND") application with the FDA. The clinical trial is evaluating PGN650 imaging in multiple solid tumor types.

Cotara is our lead DNA/histone-targeting antibody and represents a novel approach to treating brain cancer. Cotara is a targeted monoclonal antibody linked to a radioisotope that is administered as a single-infusion, one-time therapy directly into the tumor. Once localized, the targeted radioactive payload destroys the tumor from the inside out with minimal exposure to healthy tissue. Cotara has been granted orphan drug status and fast track designation for the treatment of glioblastoma multiforme ("GBM") and anaplastic astrocytoma by the FDA. In December 2012, we reached an agreement with the FDA on the trial design for a single registration trial for Cotara in patients with recurrent GBM. This trial was supported by a Phase II recurrent GBM trial and other earlier Phase I trials.

We also have a wholly-owned biomanufacturing subsidiary, Avid, which provides integrated cGMP commercial and clinical manufacturing services for Peregrine and third-party clients. Avid was established in 2002 and began commercial production in 2005. Avid's total revenue generated from third-party clients for fiscal years 2013, 2012 and 2011, amounted to $21,333,000, $14,783,000, and $8,502,000, respectively.

We were originally incorporated in California in June 1981 and reincorporated in the State of Delaware on September 25, 1996. Our principal executive offices are located at 14282 Franklin Avenue, Tustin, California, 92780 and our telephone number is (714) 508-6000. Our internet website addresses are www.peregrineinc.com , www.avidbio.com , and www.peregrinetrials.com . Information contained on, or accessed through, our websites does not constitute any part of this Annual Report.

Products in Clinical-Stage Development

The following represents a summary of recently completed, ongoing or currently planned clinical trials. Additional information pertaining to each clinical trial is further discussed below.

______________

* Filed under an exploratory Investigational New Drug Application.

Bavituximab for the Treatment of Solid Tumors

We believe our novel immunotherapy candidate bavituximab may have broad potential for the treatment of multiple types of cancer. We have conducted three randomized Phase II trials for bavituximab in combination with standard chemotherapy in front and second-line NSCLC and front-line pancreatic cancer. In addition, we have four ongoing ISTs evaluating different treatment combinations and additional oncology indications for bavituximab.

The following represents an overview of recently completed, ongoing or currently planned bavituximab clinical trials:

Bavituximab in Second-Line NSCLC

Phase III Registration Trial – Bavituximab Plus Docetaxel in Second-Line NSCLC

In May 2013, we reached an agreement with the FDA on a Phase III registration trial design of our lead clinical immunotherapeutic candidate bavituximab in second-line NSCLC. The trial design was supported by promising data from our Phase IIb second-line NSCLC trial in the same indication which is described under the heading " Phase IIb Trial – Bavituximab Plus Docetaxel in Second-Line NSCLC " below.

The Phase III clinical trial will be a randomized, double-blind, placebo-controlled trial evaluating bavituximab plus docetaxel versus docetaxel alone in approximately 600 patients at clinical sites worldwide. The trial will enroll non-squamous, NSCLC patients who have progressed after standard front-line treatment. Patients will be randomized into one of two treatment arms. One treatment arm will receive docetaxel (75 mg/m 2 ), up to six 21-day cycles, in combination with bavituximab (3 mg/kg) weekly until progression or toxicity. The other treatment arm will receive docetaxel (75 mg/m 2 ), up to six 21-day cycles, in combination with placebo weekly until progression or toxicity. The primary endpoint of the trial will be overall survival. We anticipate initiating this trial by calendar year-end 2013.

Phase IIb Trial – Bavituximab Plus Docetaxel in Second-Line NSCLC

We conducted a randomized, double-blind, placebo-controlled Phase IIb second-line NSCLC trial evaluating two dose levels of bavituximab plus docetaxel ("bavituximab-containing arms") versus docetaxel plus placebo ("control arm") as second-line treatment in 121 patients with Stage IIIb/IV NSCLC. Patients were randomized to one of three treatment arms at clinical sites worldwide and enrollment was completed in October 2011. All patients were randomized to receive up to six 21-day cycles of docetaxel (75 mg/m 2 ). In addition, one arm was randomized to receive bavituximab (3 mg/kg) weekly, a second arm was randomized to receive bavituximab (1 mg/kg) weekly, and a third arm was randomized to receive placebo weekly until progression or toxicity. The trial was designed to evaluate overall response rate ("ORR"), the primary endpoint, measured in accordance with Response Evaluation Criteria In Solid Tumors ("RECIST") criteria, and progression-free survival ("PFS"), duration of response, overall survival ("OS"), and safety, were secondary endpoints.

On September 24, 2012, we announced that during the course of preparing for an end-of-Phase II meeting with regulatory authorities and following the data announcement on September 7, 2012 from this Phase IIb trial, we discovered major discrepancies between some patient sample test results and patient treatment code assignments. As a result of these discrepancies, the data that we disclosed on or before September 7, 2012 should not be relied upon.

Upon discovery of the discrepancies, we initiated an internal review of this Phase IIb trial, which included the testing of investigational product, patient samples, reviewing the operations of multiple vendors, among other activities. The initial results of this internal review were announced on January 7, 2013, and indicated that discrepancies were isolated to the control and 1 mg/kg bavituximab-containing treatment arms of the trial and that there was no evidence of discrepancies in the 3 mg/kg bavituximab-containing treatment arm of the trial. Based on the results of our internal review, we took a conservative approach toward analyzing the results from the trial, which included combining the control arm and 1 mg/kg bavituximab-containing arm into one treatment arm ("combined control arm"), and comparing those results to the 3 mg/kg bavituximab-containing treatment arm.

On February 19, 2013, we reported updated top-line survival data from this trial based upon the completion of the aforementioned internal review of discrepancies in the trial and updated patient survival data from the trial. Updated top-line data from this Phase IIb trial indicate a meaningful improvement in median OS of 11.7 months in the 3 mg/kg bavituximab-containing arm compared to 7.3 months in the combined control arm.

On June 3, 2013, we presented the following final data from this Phase IIb trial at the 2013 ASCO Annual Meeting:

In addition, subgroup analyses of overall survival by key patient characteristics favored the bavituximab 3 mg/kg containing arm, including age, gender, Eastern Cooperative Oncology Group ("ECOG") status, ethnicity and prior treatment. The results also indicated that the 3 mg/kg bavituximab plus docetaxel combination was well-tolerated with no significant differences in adverse events between the two trial arms.

Based on these data and discussions with our medical advisors, our strategy is to initiate a pivotal Phase III trial with bavituximab in second-line NSCLC by the end of calendar year 2013 as further discussed above.

Second-Line NSCLC Market Opportunity

There are approximately 135,000 patients with NSCLC receiving second-line treatment annually in the U.S., Europe and Japan. The market for second-line NSCLC therapeutics is expected to exceed $1.0 billion annually by 2019 according to independent market research estimates.

Only three drugs are approved in the U.S. as second-line treatment for NSCLC. Administered as monotherapies, these include pemetrexed (Alimta®), docetaxel (Taxotere®), or erlotinib (Tarceva®). Package insert information for these three products shows between 5% and 9% ORR for second-line NSCLC. Given these low response rates with current approved therapies, we believe there is a need for new therapeutic options for second-line NSCLC.

Bavituximab in Front-Line NSCLC

We currently have two clinical trials investigating the potential of bavituximab in front-line NSCLC as follows:

Phase II Trial – Bavituximab Plus Paclitaxel/Carboplatin in Front-Line NSCLC

Our Phase II trial is designed to assess bavituximab in combination with paclitaxel and carboplatin in front-line NSCLC. This randomized trial enrolled 86 patients (enrollment completed in September 2011) at clinical sites worldwide. Patients were randomized to one of two treatment arms. All patients were randomized to receive up to six 21-day cycles of paclitaxel and carboplatin ("C/P"). In addition, one arm was randomized to receive bavituximab (3 mg/kg) weekly until progression or toxicity. The primary endpoint of this trial is ORR and secondary endpoints include median PFS, median OS, duration of response, and safety. Patients were evaluated regularly for tumor response according to RECIST criteria.

In March 2012, we announced top-line data from this Phase II trial in which the primary ORR endpoint was determined. Initial ORR and median PFS data from this trial were deemed inconclusive and therefore, it was determined that median OS, another secondary endpoint, would be an important data point in determining our next steps in advancing bavituximab in front-line NSCLC in combination with carboplatin and paclitaxel.

Prompted by the enhanced understanding of bavituximab's immunotherapy mechanism of action that we presented at the 2013 AACR Annual Meeting, we recently undertook a review of our entire ongoing bavituximab clinical program, including an early analysis of this Phase II front-line NSCLC trial, in order to better direct our clinical development strategy. Results from this analysis, which included less than 60% of survival events, were announced in June 2013 and indicated that, while the bavituximab containing treatment arm currently demonstrated a median OS of over 14 months, there was no meaningful difference in survival between the two arms of the trial that would support the advancement of this combination and the current timing of therapy. Separately, an independent trial with another immunotherapy agent showed that when C/P are given together with immunotherapy, as was done in this trial, the results were similar to the control arm while starting with C/P before administering the immunotherapy gave much more favorable results. We are currently evaluating options for moving bavituximab forward in front-line NSCLC. We plan to present the full results from this Phase II trial at a future scientific meeting or through publication.

Phase Ib Trial – Bavituximab Plus Pemetrexed/Carboplatin in Front-Line NSCLC

This investigator-sponsored Phase Ib trial is designed to assess bavituximab with pemetrexed and carboplatin in up to 25 patients with locally advanced or metastatic NSCLC. Initial data presented at AACR in April 2012 on the first five patients showed three of the five patients achieving a partial tumor response and no signs of unexpected safety events. This trial continues to enroll and dose patients.

Front-Line NSCLC Market Opportunity

Lung cancer is the leading cause of cancer-related deaths, and according to the American Cancer Society, lung cancer is the second most commonly diagnosed cancer in the U.S., with approximately 228,190 new cases and 159,480 deaths each year, representing approximately 27% of all cancer deaths. NSCLC is the most common type of lung cancer, accounting for approximately 85-90% of lung cancer cases.

With new cases being diagnosed and given the limitations of current therapies, we believe there is a need for new therapeutic options for front-line NSCLC.

Current treatment options for front-line NSCLC include chemotherapy drugs gemcitabine (Gemzar ® ), paclitaxel (Taxol ® ), or docetaxel (Taxotere ® ) combined with cisplatin or carboplatin. In addition, pemetrexed has been approved for use in combination with cisplatin for front-line NSCLC and bevacizumab (Avastin ® ) is often added to the standard chemotherapy for front-line NSCLC. Also, Crizotinib (Xalkori ® ) is approved for front-line treatment of locally advanced or metastatic NSCLC that is anaplastic lymphoma kinase (ALK)-positive and erlotinib (Tarceva ® ) is approved for the front-line treatment metastatic NSCLC tumors with epidermal growth factor receptor mutations.

Bavituximab in Pancreatic Cancer

Our Phase II trial was designed to assess bavituximab in combination with gemcitabine in previously untreated Stage IV pancreatic cancer patients. This randomized trial enrolled 70 patients (enrollment completed in June 2012) at clinical sites worldwide. Patients were randomized to one of two treatment arms. All patients were randomized to receive gemcitabine (1000 mg/m2) on days 1, 8 and 15 of each 28-day cycle (4 weeks) until disease progression or unacceptable toxicities. In addition, patients in one arm were randomized to receive bavituximab (3 mg/kg) weekly. The primary endpoint of this trial was median OS and secondary endpoints included median PFS, ORR, duration of response, and safety. Patients were evaluated regularly for tumor response according to RECIST criteria.

In February 2013, we announced results from this trial showing that the combination of bavituximab and gemcitabine resulted in more than a doubling of ORR and an improvement in OS when compared with gemcitabine alone (control arm). In the trial, patients treated with a combination of bavituximab and gemcitabine had a 28% tumor response rate as compared to 13% in the control arm. Median OS was 5.6 months for the bavituximab plus gemcitabine arm and 5.2 months for the control arm. In this trial, bavituximab was generally safe and well tolerated in combination with gemcitabine with similar adverse events occurring in both arms. As this trial allowed for the enrollment of patients 18 and older without any age limit, distant organ involvement and ECOG performance status of 0-2, further analysis of the patient group was warranted.

In June 2013, we announced final results from this trial which included a further analysis of patient subgroups. Median OS, PFS and ORR results were unchanged from the February announcement with data showing encouraging activity in this patient population with very rapid disease progression.

Results from a subgroup analysis showed that the effect of bavituximab plus gemcitabine was more pronounced in patients with ECOG ≤ 1 and those without hepatic metastases. While we believe the final data combined with the results from subgroup analyses warrant future consideration, given the fast progression of pancreatic cancer and the need for longer treatment periods associated with immunotherapies such as bavituximab, there are no plans to initiate a follow-on trial in pancreatic cancer at this time.

Bavituximab in HER2-negative Metastatic Breast Cancer (MBC)

This ongoing investigator-sponsored Phase I trial is designed to assess bavituximab combined with paclitaxel in up to 14 patients with HER2-negative metastatic breast cancer. In June 2013, investigators reported interim results from 13 evaluable patients showing that 85% of patients achieved an objective tumor response, including 15% of patients achieving a complete response measured in accordance with RECIST criteria. All patients have been enrolled in the trial.

Bavituximab in Advanced Liver Cancer

This ongoing investigator-sponsored Phase I/II trial is designed to assess bavituximab combined with sorafenib (Nexavar ® ) in up to 48 patients with advanced liver cancer (hepatocellular carcinoma, or HCC). Data presented at AACR in April 2012 showed that of the nine patients enrolled in the Phase I portion of the study, no dose-limiting toxicities or serious adverse events were observed and the trial is now enrolling in the Phase II part of the study. This trial continues to enroll and dose patients.

Bavituximab in Rectal Adenocarcinoma

This ongoing investigator-sponsored Phase I trial is designed to assess bavituximab in combination with capecitabine and radiation therapy in up to 18 patients with Stage II or III rectal adenocarcinoma. The primary endpoint is to determine the safety, feasibility and tolerability with a standard platform of capecitabine and radiation therapy. Secondary endpoints include ORR and histopathological response in patients. This trial continues to enroll and dose patients.

PS-Targeting Molecular Imaging Program (PGN650)

In addition to our PS-targeting antibodies potential to treat cancer, we believe these antibodies may have broad potential for the imaging and diagnosis of multiple diseases, including cancer. PS-targeting antibodies are able to target diseases that present PS on the surface of distressed cells, which we believe is present in multiple disease settings. In oncology, PS is a molecule usually located inside the membrane of healthy cells, but "flips" and becomes exposed on the outside of cells that line tumor blood vessels, creating a specific target for the imaging of multiple solid tumor types.

Our initial clinical candidate is PGN650, a first-in-class PS-targeting F(ab')2 fully human monoclonal antibody fragment joined to the positron emission tomography ("PET") imaging radio-isotope iodine-124 ( 124 I) that represents a potential new approach to imaging cancer. In preclinical studies, PGN650 accumulates in tumor vasculature and provides exceedingly clear in vivo tumor images.

Our initial goal for the PGN650 program is to further validate the broad nature of the PS-targeting platform in the clinic. Our current PGN650 clinical trial evaluating PGN650 imaging in multiple solid tumor types was filed under an exploratory IND with the FDA and will enroll up to 12 patients. Results from this study may open the door for multiple applications including development of antibody drug conjugates, the ability of PGN650 to monitor the effectiveness of current standard cancer treatments, and the ability to potentially select patients that may benefit from bavituximab-based treatment. Patients will receive an imaging dose followed by three (3) PET images: two images on day one and one image on either day two or three. Successful results from this trial could support several promising new areas of research in the imaging and diagnostic fields. This trial continues to enroll and dose patients.

Cotara for the Treatment of Brain Cancer

Cotara is our lead DNA/histone-targeting antibody and represents a novel approach to treating brain cancer. Cotara is a monoclonal antibody linked to a radioisotope (Iodine 131) that is administered as a single-infusion, one-time therapy directly into the tumor, thereby destroying the tumor from the inside out with minimal exposure to surrounding healthy tissue. In four prior clinical studies, Cotara has demonstrated encouraging survival, localization to the tumor, and an acceptable safety profile in patients with brain cancer.

Cotara has been granted FDA and European Medicines Agency ("EMA") orphan drug status for GBM and anaplastic astrocytoma and fast track designation in the U.S. for the treatment of recurrent GBM.

In our Phase II single-arm, multicenter trial, 41 patients with GBM at first relapse received a single Cotara treatment. The primary endpoint was safety and tolerability of the maximum tolerated dose, a single 25-hour interstitial infusion of 2.5 mCi/cc of Cotara. Secondary endpoints include median OS, median PFS, and proportion of patients alive at six months after treatment. Median OS for patients treated with Cotara was 9.3 months, consistent with a prior Phase II trial.

Cotara was generally safe and well tolerated in this trial. The most common drug-related adverse events (AEs) were neurologic in nature and most were managed with corticosteroids.

In December 2012, we reached an agreement with the FDA on the design of a single randomized registration trial comparing two dose levels of Cotara in up to 300 patients. We are currently seeking a partner to further develop Cotara in recurrent GBM.

GBM Market Opportunity

According to the American Cancer Society, in 2012 there were expected to be an estimated 22,900 malignant tumors diagnosed and approximately 13,700 deaths attributed to brain or spinal cord cancer in the United States ("U.S."). GBM accounts for about 43% of all malignant brain tumors and primarily occurs in older adults (median age at diagnosis is 64 years) with the 5-year survival rate less than 5%.

Mechanism of Action of Our Technology Platforms

Our three products in clinical development fall under two technology platforms: PS-targeting technology and DNA/histone-targeting antibody.

PS-Targeting Technology Platform

Peregrine's new class of PS-targeting therapeutics are monoclonal antibodies that target and bind to PS, a component of cells normally found only on the inner surface of the cell membrane. Under stress or apoptosis, PS becomes exposed on the surface of tumor blood vessels and on virus-infected cells, exposing a specific target for imaging and therapy of multiple diseases.

PS is a highly immunosuppressive molecule usually located inside the membrane of healthy cells, but "flips" and becomes exposed on the outside of tumor cells and cells that line tumor blood vessels, causing the tumor to evade immune detection. Cancer therapies increase PS exposure on the cell surface, further increasing immune suppression in the tumor environment. Bavituximab targets PS and works by activating the immune system causing the maturation of cancer-fighting (M1) macrophages and the development of cytotoxic T-cells that fight tumors.

In March 2013, data from a series of preclinical studies presented at the Annual Meeting of the AACR demonstrated that PS-targeting antibodies, such as bavituximab, mediate important immuno-stimulatory changes in tumors. These changes include the increased production of inflammatory cytokines, inhibition of immunosuppressive myeloid derived suppressor cells ("MDSCs"), and an increase in tumor-fighting (M1) macrophages and mature dendritic cells that lead to the formation of tumor fighting T-cells.

DNA/Histone-Targeting Antibody (Cotara)

Peregrine's DNA/histone-targeting antibody uses monoclonal antibodies designed to bind to DNA/histone H1 complex which is exposed primarily in the dead and dying cells that are present in abundance at the center of solid tumors. DNA/histone-targeting antibodies are capable of carrying a variety of therapeutic agents, including radioisotopes, into the interior of solid tumors where they kill the tumor from the inside out. Peregrine's lead DNA/histone-targeting antibody, Cotara, is an antibody conjugated to a therapeutic radioisotope, Iodine 131, that binds to the core of the tumor mass and kills adjacent tumor cells.

In-Licensing Collaborations

The following represents a summary of our key collaborations for the development and commercialization of our products in clinical development covering bavituximab, PGN650, and Cotara.

Bavituximab

In August 2001 and August 2005, we exclusively in-licensed the worldwide rights to the PS-targeting technology platform from the University of Texas Southwestern Medical Center at Dallas ("UTSWMC"), including bavituximab. During November 2003, we entered into a non-exclusive license agreement with Genentech, Inc., to license certain intellectual property rights covering methods and processes for producing antibodies used in connection with the development of our PS-targeting program. During December 2003, we entered into an exclusive commercial license agreement with Avanir Pharmaceuticals, Inc., ("Avanir") covering the generation of a chimeric monoclonal antibody. In March 2005, we entered into a worldwide non-exclusive license agreement with Lonza Biologics ("Lonza") for intellectual property and materials relating to the expression of recombinant monoclonal antibodies for use in the manufacture of bavituximab.

Under our in-licensing agreements relating to bavituximab, we typically pay an up-front license fee, annual maintenance fees, and are obligated to pay future milestone payments based on potential clinical development and regulatory milestones, plus a royalty on net sales and/or a percentage of sublicense income. The applicable royalty rate under each of the foregoing in-licensing agreements is in the low single digits. During fiscal year 2011, we expensed $114,000 associated with milestone obligations under in-licensing agreements covering bavituximab, which is included in research and development expense in the accompanying consolidated statements of operations and comprehensive loss. We did not incur any milestone related expenses during fiscal years 2013 and 2012.

The following table provides certain information with respect to each of our in-licensing agreements relating to our bavituximab program.

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Of the total potential future milestone obligation of $6,800,000, we anticipate milestone obligations not to exceed $200,000 during fiscal year 2014. In addition, of the total potential future milestone obligations of $6,800,000, up to $6,400,000 would be due upon the first commercial approval of bavituximab pursuant to these license agreements. However, given the uncertainty of the drug development and the regulatory approval process, we are unable to predict with any certainty when any of these milestones will occur, if at all.

PGN650

In October 1998, we exclusively in-licensed worldwide rights from UTSWMC, to certain patent families, which was amended in January 2000 to license patents related to aminophospholipid targeting conjugates, such as PGN650. Under the October 1998 license agreement, as amended, we are obligated to pay UTSWMC future milestone payments of up to $300,000 for PGN650 based on the achievement of certain potential clinical development and commercial milestones, plus a low single digit royalty on net sales.

In addition, during fiscal year 2007, we entered into a research collaboration agreement and a development and commercialization agreement with Affitech A/S regarding the generation and commercialization of a certain number of fully human monoclonal antibodies under our platform technologies to be used as possible future clinical candidates, including our imaging agent PGN650. During fiscal year 2013, we elected to enter into a license agreement for the PS-targeting antibody used to create PGN650 and agreed to pay an up-front license fee and are obligated to pay future milestone payments of up to $1,921,000 based on the achievement of certain potential clinical development and regulatory milestones, plus a low single digit royalty on net sales.

During fiscal year 2013, we expensed $50,000 under in-licensing agreements covering PGN650, which is included in research and development expense in the accompanying consolidated statements of operations and comprehensive loss. We did not incur any milestone related expenses during fiscal years 2012 or 2011 covering PGN650. In addition, no product revenues have been generated from PGN650 program to date. We anticipate milestone obligations for PGN650 under this agreement not to exceed $51,000 during fiscal year 2014.

Cotara

We acquired the patent rights to Cotara in July 1994 after the merger between Peregrine and Cancer Biologics, Inc. was approved by our stockholders. To date, no product revenues have been generated from Cotara.

In October 2004, we entered into a worldwide non-exclusive license agreement with Lonza for intellectual property and materials relating to the expression of recombinant monoclonal antibodies for use in the manufacture of Cotara. Under the terms of the agreement, we are obligated to pay a royalty (in the low single digits) on net sales of any products we market that utilize the underlying technology. In the event a product is approved and we or Lonza do not manufacture Cotara, we would owe Lonza 300,000 pounds sterling per year (or approximately $465,000 U.S. based on the exchange rate at April 30, 2013) in addition to an increased royalty (in the low single digits) on net sales. In addition, upon completion of patient enrollment in our Cotara Phase II clinical trial during fiscal year 2011, we incurred a milestone payment of 75,000 pounds sterling (or $125,000 U.S.), which amount will continue as an annual license fee thereafter. Unless sooner terminated due to a party's breach of the license agreement, the license agreement with Lonza will terminate upon the last to occur of the expiration of a period of 15 years following our first commercial sale of a product or the expiration of the last valid claim within the patents that are the subject of the license agreement; provided that if after the expiration of the last claim but prior to the expiration of the 15-year period, Lonza has publicly made available certain materials and know-how, then the agreement will terminate at such time as the materials and know-how are made public.

Out-Licensing Collaborations

In addition to our in-licensing collaborations, the following represents a summary of our key out-licensing collaborations.

During October 2000, we entered into a licensing agreement with Merck KGaA to out-license a segment of our Cotara technology for use in the application of cytokine fusion proteins. During January 2003, we entered into an amendment to the license agreement, whereby we received an extension to the royalty period from six years to ten years from the date of the first commercial sale. Under the terms of the agreement, we would receive a royalty on net sales if a product is approved under the agreement. Merck KGaA is currently in the clinical development stage of this program.

During July 2009, we entered into a patent assignment and sublicense (collectively, the "Affitech Agreements") with Affitech A/S ("Affitech") whereby we licensed exclusive worldwide rights to develop and commercialize certain products under our anti-vascular endothelial growth factor ("VEGF") intellectual property portfolio, including the fully human antibody AT001/r84. We recognized revenue of $350,000 during fiscal years 2013, 2012 and 2011 under the Affitech Agreements, which amounts are included in license revenue in the accompanying consolidated financial statements. During September 2010, Peregrine and Affitech amended certain terms of the Affitech Agreements for sublicenses entered into by Affitech with non-affiliates for the territories of Brazil, Russia and other countries of the Commonwealth of Independent States ("CIS") ("September 2010 Amendment"). Under the amended terms, Peregrine and Affitech will reinvest their respective portions of any future milestone payments to be received under the agreements for the territories of Brazil, Russia, and the CIS toward the further development of AT001/r84. In the event Affitech enters into a licensing transaction for AT001/r84 with a non-affiliate in a major pharmaceutical market (defined as U.S., European Union, Switzerland, United Kingdom and/or Japan), Affitech has agreed to reimburse us the aforementioned sublicense fees we agreed to forego that were applied to the AT001/r84 program while Affitech will be eligible to be reimbursed for up to 50% of their development costs in Brazil, Russia and CIS territories. The remaining terms of the Affitech Agreements remain unchanged, including milestone and royalty payments. To date, we have not received any payments from Affitech under the September 2010 Amendment.

Avid Bioservices, Inc., Integrated Biomanufacturing Subsidiary

Our wholly-owned subsidiary, Avid is a Contract Manufacturing Organization ("CMO") that provides fully-integrated services from cell line and process development to clinical and commercial biomanufacturing under current Good Manufacturing Practices ("cGMP") for Peregrine and Avid's third-party clients. Avid's total revenue generated from third-party customers for fiscal years 2013, 2012, and 2011 amounted to $21,333,000, $14,783,000, and $8,502,000, respectively.

Avid manufactures cGMP commercial and clinical products and has over 10 years of experience developing and producing monoclonal antibodies, recombinant proteins and enzymes in batch, fed-batch and perfusion modes. Avid provides an array of contract biomanufacturing services that support the development and cGMP production of clinical and commercial monoclonal antibodies, recombinant proteins and enzymes, including cell culture development, process development and testing of biologics for biopharmaceutical and biotechnology companies under cGMP. In its cGMP manufacturing suite, Avid maintains three stainless steel bioreactors: a 1,000 liter, a 300 liter, and a 100 liter, and three single-use bioreactors: a 1,000 liter, a 200 liter and a 50 liter.

Operating a cGMP facility requires highly specialized personnel and equipment that must be maintained on a continual basis. Prior to the formation of Avid, we manufactured our own antibodies for more than 10 years and developed the manufacturing expertise and quality systems to provide the same service to other biopharmaceutical and biotechnology companies.

The manufacturing of monoclonal antibodies and recombinant proteins under cGMP is a complex process that includes several phases before the finished drug product is released for clinical or commercial use. The first phase of the manufacturing process, called technology transfer phase, is to receive the production cell line (the cells that produce the desired protein) and any available process information from the client. The cell line must be adequately tested according to FDA guidelines and/or other regulatory guidelines to certify that it is suitable for cGMP manufacturing.

The second phase of the process occurs within the manufacturing facility. Once the process is developed, pilot runs are generally performed using smaller scale bioreactors, such as the 36 or 100 liter bioreactors, in order to verify the process. Once the process is set, the process will be transferred to cGMP manufacturing and a pilot run(s) or full scale engineering run(s) will be performed to finalize manufacturing batch records. After completing the pilot batch run(s), full-scale cGMP manufacturing is typically initiated. Once the cGMP run(s) is completed, batch samples are taken for various required tests, including sterility and viral testing. Once the test results verify that the material meets specifications, the material and/or product is released for its intended use.

Each batch manufactured is tailored to meet the specific needs of Peregrine or the client. Full process development from start to finish can take ten months or longer. All stages of manufacturing can generally take from one to several weeks depending on the manufacturing method and process. Material or product testing and release can take up to an additional three months to complete, once the manufacturing process is complete.

Given its inherent complexity, necessity for detail, and magnitude (contracts may be into the millions of dollars), contract negotiations and sales cycle for cGMP manufacturing services can take a significant amount of time. Our anticipated sales cycle from client introduction to signing an agreement will take anywhere from between six months to more than one year.

To date, Avid has been audited and qualified by large and small, domestic and foreign, biotechnology companies interested in the production of biologic material for clinical and commercial use. Additionally, Avid has been audited by the European Regulatory authorities, the FDA and the California Department of Health.

Government Regulation

Regulation by governmental authorities in the U.S. and other countries is a significant factor in our ongoing research and development activities and in the production of our products under development. Our products and our research and development activities are subject to extensive governmental regulation in the U.S., including the Federal Food, Drug, and Cosmetic Act, as amended, the Public Health Service Act, also as amended, as well as to other federal, state and local statutes and regulations. These laws, and similar laws outside the U.S., govern the clinical and non-clinical testing, manufacture, safety, effectiveness, approval, labeling, distribution, sale, import, export, storage, record keeping, reporting, advertising and promotion of our products, if approved. Violations of regulatory requirements at any stage may result in various adverse consequences, including regulatory delay in approving or refusal to approve a product, enforcement actions, including withdrawal of approval, labeling restrictions, seizure of products, fines, injunctions and/or civil or criminal penalties. Any product that we develop must receive all relevant regulatory approvals or clearances before it may be marketed in a particular country.

The regulatory process, which includes extensive preclinical testing and clinical trials of each product candidate to study its safety and efficacy, is uncertain, takes many years and requires the expenditure of substantial resources. We cannot assure you that the clinical trials of our product candidates under development will demonstrate the safety and efficacy of those product candidates to the extent necessary to obtain regulatory approval.

The activities required before a product may be marketed in the U.S., such as Cotara or bavituximab, are generally performed in the following sequential steps:

In addition, we are subject to regulation under state, federal, and international laws and regulations regarding occupational safety, laboratory practices, the use and handling of radioactive isotopes, environmental protection and hazardous substance control, and other regulations. Our clinical trial and research and development activities involve the controlled use of hazardous materials, chemicals and radioactive compounds. Although we believe that our safety procedures for handling and disposing of such materials comply with the standards prescribed by state and federal regulations, the risk of accidental contamination or injury from these materials cannot be completely eliminated. In the event of such an accident, we could be held liable for any damages that result and any such liability could exceed our financial resources. In addition, disposal of radioactive materials used in our clinical trials and research efforts may only be made at approved facilities. We believe that we are in material compliance with all applicable laws and regulations including those relating to the handling and disposal of hazardous and toxic waste.

Our product candidates, if approved, may also be subject to import laws in other countries, the food and drug laws in various states in which the products are or may be sold and subject to the export laws of agencies of the U.S. government.

In addition, we must also adhere to current Good Manufacturing Practice ("cGMP") and product-specific regulations enforced by the FDA through its facilities inspection program. Failure to comply with manufacturing regulations can result in, among other things, warning letters, fines, injunctions, civil penalties, recall or seizure of products, total or partial suspension of production, refusal of the government to renew marketing applications and criminal prosecution.

During fiscal year 1999, the Office of Orphan Products Development of the FDA determined that Cotara qualified for orphan designation for the treatment of glioblastoma multiforme and anaplastic astrocytoma (both brain cancers). The 1983 Orphan Drug Act (with amendments passed by Congress in 1984, 1985 and 1988) includes various incentives that have stimulated interest in the development of orphan drug and biologic products. These incentives include a seven-year period of marketing exclusivity for approved orphan products, tax credits for clinical research, protocol assistance, and research grants. Additionally, legislation re-authorizing FDA user fees also created an exemption for orphan products from fees imposed when an application to approve the product for marketing is submitted. A grant of an orphan designation is not a guarantee that a product will be approved. If a sponsor receives orphan drug exclusivity upon approval, there can be no assurance that the exclusivity will prevent another entity from receiving approval for the same or a similar drug for the same or other uses.

Cotara was granted Fast Track designation by the FDA for the treatment of recurrent glioblastoma multiforme. This designation facilitates the development and expedites the review of new drugs that are intended to treat serious or life-threatening conditions and that demonstrate the potential to address unmet medical needs. The Fast Track mechanism is described in the Food and Drug Administration Modernization Act of 1997 ("FDAMA"). The benefits of Fast Track include scheduled meetings to seek FDA input into development plans, the option of submitting an NDA in sections rather than all components simultaneously and the option of requesting evaluation of studies using surrogate endpoints.

Manufacturing and Raw Materials

Manufacturing . We manufacture pharmaceutical-grade products to supply our clinical trials through our wholly owned subsidiary, Avid. We have assembled a team of experienced scientific, production and regulatory personnel to facilitate the manufacturing of our antibodies, including bavituximab and Cotara.

Our bavituximab product is shipped directly from our facility to the clinical trial sites or to third party depots that distribute the clinical trial materials to clinical sites. Cotara is shipped to a third party facility for radiolabeling (the process of attaching the radioactive agent, Iodine 131, to the antibody). From the radiolabeling facility, Cotara is shipped directly to the clinical sites for use in clinical trials.

Any commercial radiolabeling supply arrangement will require a significant investment of funds by us in order for a radiolabeling vendor to develop the expanded facilities necessary to support our product. There can be no assurance that material produced by our current radiolabeling supplier will be suitable for commercial quantities to meet the possible demand of Cotara, if approved. We will continue with our research in radiolabeling scale-up, but we believe this research will be eventually supported by a potential licensing or marketing partner for Cotara.

Raw Materials. Various common raw materials are used in the manufacture of our products and in the development of our technologies. These raw materials are generally available from several alternate distributors of laboratory chemicals and supplies. We have not experienced any significant difficulty in obtaining these raw materials and we do not consider raw material availability to be a significant factor in our business.

Patents and Trade Secrets

Peregrine continues to seek patents on inventions originating from ongoing research and development activities within the Company and in collaboration with other companies and university researchers. In addition to seeking patent protection in the U.S., we typically file patent applications in Europe, Canada, Japan and additional countries on a selective basis. Patents, issued or applied for, cover inventions relating in general to cancer therapy and anti-viral therapy and in particular to different proteins, peptides, antibodies and conjugates, methods and devices for labeling antibodies, and therapeutic and diagnostic uses of the peptides, antibodies and conjugates. We intend to pursue opportunities to license these technologies and any advancements or enhancements, as well as to pursue the incorporation of our technologies in the development of our own products.

Our issued patents extend for varying periods according to the date of patent application filing and/or grant and the legal term of patents in the various countries where patent protection is obtained. In the U.S., patents issued on applications filed prior to June 8, 1995 have a term of 17 years from the issue date or 20 years from the earliest effective filing date, whichever is longer. U.S. patents issued on applications filed on or after June 8, 1995, have a term first calculated as 20 years from the earliest effective filing date, not counting any provisional application filing date. Certain U.S. patents issued on applications filed on or after June 8, 1995, and particularly on applications filed on or after May 29, 2000, are eligible for Patent Term Adjustment ("PTA"), which extends the term of the patent to compensate for delays in examination at the U.S. Patent and Trademark Office. The term of foreign patents varies in accordance with provisions of applicable local law, but is typically 20 years from the effective filing date, which is often the filing date of an application under the provisions of the Patent Cooperation Treaty ("PCT").

In addition, in certain cases, the term of U.S. and foreign patents can be extended to recapture a portion of the term effectively lost as a result of health authority regulatory review. As such, certain U.S. patents may be eligible for Patent Term Extension under 35 U.S.C. § 156 (known as "the Hatch-Waxman Act") to restore the portion of the patent term that has been lost as a result of review at the U.S. FDA. Such extensions, which may be up to a maximum of five years (but cannot extend the remaining term of a patent beyond a total of 14 years), are potentially available to one U.S. patent that claims an approved human drug product (including a human biological product), a method of using a drug product, a method of manufacturing a drug product, or a medical device.

We consider that in the aggregate our patents, patent applications and licenses under patents owned by third parties are of material importance to our operations. Of the patent portfolios that are owned, controlled by or exclusively licensed to Peregrine, those concerning our PS-Targeting Technology Platform, including bavituximab, and our Cotara product are of particular importance to our operations.

Our patent portfolios relating to the PS-Targeting Technology Platform in oncology include U.S. and foreign patents and patent applications with claims directed to methods, compositions and combinations for targeting tumor vasculature and imaging and treating cancer using antibodies and conjugates that localize to the aminophospholipids, PS (Phosphatidylserine) and PE (Phosphatidylethanolamine), exposed on tumor vascular endothelial cells. These patents, and any related patent applications that may issue as patents, are currently set to expire between 2019 and 2021.

Our patent portfolios relating to the PS-Targeting Technology Platform in the viral field include U.S. and foreign patents and patent applications with claims directed to methods, compositions and combinations for inhibiting viral replication or spread and for treating viral infections and diseases using antibodies and conjugates that localize to the aminophospholipids, PS and PE, exposed on viruses and virally-infected cells. These patents, and certain related patent applications that may issue as patents, are currently set to expire in 2023.

Additionally, we have U.S. and foreign patents and patent applications relating more specifically to our product, bavituximab, including compositions, combinations and methods of use in treating angiogenesis and cancer and in treating viral infections and diseases. These patents, and certain related patent applications that may issue as patents, are currently set to expire between 2023 and 2025.

Our patent portfolios relating to the Cotara product include U.S. and foreign patents with claims directed to compositions of matter and claims directed to diagnostic methods, which patents are currently set to expire in 2017 and 2016, respectively. Our Cotara product is also protected by patents and patent applications that include claims directed to methods and apparatus for radiolabeling and to the resultant radiolabeled products. The radiolabeling patents in the U.S. and overseas, and any related patent applications that may issue as patents, are currently set to expire between 2024 and 2028.

The information given above is based on our current understanding of the patents and patent applications that we own, control, or have exclusively licensed. The information is subject to revision, for example, in the event of changes in the law or legal rulings affecting our patents, or if we become aware of new information. In particular, the expiry information given above does not account for possible extension of any U.S. or foreign patent to recapture patent term effectively lost as a result of FDA or other health authority regulatory review. We intend to seek such extensions, as appropriate to approved product(s), which may be up to a maximum of five years (but not extending the term of a patent beyond 14 years).

The actual protection afforded by a patent, which can vary from country to country, depends upon the type of patent, the scope of its coverage and the availability of legal remedies in the country. We have either been issued patents or have patent applications pending that relate to a number of current and potential products including products licensed to others. In general, we have obtained licenses from various parties that we deem to be necessary or desirable for the manufacture, use or sale of our products. These licenses (both exclusive and non-exclusive) generally require us to pay royalties to the parties. The terms of the licenses, obtained and what we expect to be obtained, are not expected to significantly impact the cost structure or marketability of the Company's products.

In general, the patent position of a biotechnology firm is highly uncertain and no consistent policy regarding the breadth of issued claims has emerged from the actions of the U.S. Patent Office and courts with respect to biotechnology patents. Similar uncertainties also exist for biotechnology patents in important overseas markets. Accordingly, there can be no assurance that our patents, including those issued and those pending, will provide protection against competitors with similar technology, nor can there be any assurance that such patents will not be legally challenged, invalidated, infringed upon and/or designed around by others.

International patents relating to biologics are numerous and there can be no assurance that current and potential competitors have not filed or in the future will not file patent applications or receive patents relating to products or processes utilized or proposed to be used by the Company. In addition, there is certain subject matter which is patentable in the U.S. but which may not generally be patentable outside of the U.S. Statutory differences in patentable subject matter may limit the protection the Company can obtain on some of its products outside of the U.S. These and other issues may prevent the Company from obtaining patent protection outside of the U.S. Failure to obtain patent protection outside the U.S. may have a material adverse effect on the Company's business, financial condition and results of operations.

No one has sued us for infringement and no third party has asserted their patents against us that we believe are of any merit. However, there can be no assurances that such lawsuits have not been or will not be filed and, if so filed, that we will prevail or be able to reach a mutually beneficial settlement.

We also intend to continue to rely upon trade secrets and improvements, unpatented proprietary know-how, and continuing technological innovation to develop and maintain our competitive position in research and development of therapeutic and diagnostic products. We typically place restrictions in our agreements with third-parties, which contractually restrict their right to use and disclose any of the Company's proprietary technology with which they may be involved. In addition, we have internal non-disclosure safeguards, including confidentiality agreements, with our employees. There can be no assurance, however, that others may not independently develop similar technology or that the Company's secrecy will not be breached.

Customer Concentration and Geographic Area Financial Information

We are currently in the research and development phase for all of our products and we have not generated any product sales from any of our technologies under development. For financial information concerning Avid's customer concentration and geographic areas of its customers, see Note 11, "Segment Reporting" to the accompanying consolidated financial statements.

Marketing Our Potential Products

We intend to sell our products, if approved, in the U.S. and internationally in collaboration with marketing partners or through a direct sales force. If the FDA approves bavituximab or Cotara or our other product candidates under development, the marketing of these product candidates will be contingent upon us entering into an agreement with a company to market our products or upon us recruiting, training and deploying our own sales force, either internally or through a contract sales organization. We do not presently possess the resources or experience necessary to market bavituximab, Cotara, or any of our other product candidates and we currently have no arrangements for the distribution of our product candidates, if approved. Development of an effective sales force requires significant financial resources, time and expertise. There can be no assurance that we will be able to obtain the financing necessary to establish such a sales force in a timely or cost effective manner or that such a sales force will be capable of generating demand for our product candidates.

Competition

The pharmaceutical and biotechnology industry is intensely competitive and subject to rapid and significant technological change. Many of the drugs that we are attempting to discover or develop will be competing with existing therapies. In addition, we are aware of several pharmaceutical and biotechnology companies actively engaged in research and development of antibody-based products that have commenced clinical trials with, or have successfully commercialized, antibody products. Some or all of these companies may have greater financial resources, larger technical staffs and larger research budgets than we have, as well as greater experience in developing products and running clinical trials. We expect to continue to experience significant and increasing levels of competition in the future. In addition, there may be other companies which are currently developing competitive technologies and products or which may in the future develop technologies and products that are comparable or superior to our technologies and products.

Bavituximab is currently in clinical trials for the treatment of advanced solid tumors, including our lead indication in second-line NSCLC. Although we are not aware of any other monoclonal antibodies in clinical development targeting PS as a potential therapy for advanced solid tumors, there are a number of possible competitors with approved or developmental targeted agents used alone or in combination with standard chemotherapy for the treatment of cancer, including but not limited to, Abraxane by Celegene, Afatinib and Vargatef by Boehringer Ingelheim, Avastin ® (bevacizumab) and onartuzumab by Roche, Erbitux ® (Cetuximab) by Eli Lilly and Company and Bristol-Myers Squibb Company, ganetespib by Synta Pharmaceuticals, Herceptin ® (trastuzumab) by Roche, Rituxan ® (rituximab) and Tarceva ® (erlotinib) by OSI Pharmaceuticals, Inc. and Roche, Xalkori ® (crizotinib) by Pfizer, and Yervoy ® (ipilimumab) and nivolumab by Bristol-Myers Squibb Company. Additional possible competitors also exist with approved or developmental immunotherapies including but not limited to AMP-224 by GlaxoSmithKline , lambrolizumab by Merck & Co., MEDI-4736 by AstraZeneca, pidilizumab by Curetech, RD7466 by Roche and other Active Cellular Immunotherapy candidates by Dendreon and Astuprotimut-r by GlaxoSmithKline . There are a significant number of companies developing cancer therapeutics using a variety of targeted and non-targeted approaches. A direct comparison of these potential competitors will not be possible until bavituximab advances to later-stage clinical trials.

We are developing Cotara for the treatment of recurrent GBM, the most aggressive form of brain cancer. Since Cotara is a single-treatment approach that targets brain tumors from the inside out, it is a novel treatment dissimilar from other drugs approved or in development for this disease. Approved treatments for brain cancer include the Gliadel ® Wafer (polifeprosan 20 with carmustine implant) from Eisai, Inc., Temodar ® (temozolomide) from Merck, Avastin ® (bevacizumab) from Roche, and the NovoTTF-100A System by Novocure. Gliadel Wafers are inserted in the tumor cavity following surgical resection and releases a chemotherapeutic agent over time. Temodar ® is administered orally to patients with brain cancer. Avastin ® is a monoclonal antibody that targets VEGF to prevent the formation of new tumor blood vessels. The NovoTTF-100A system is a portable, wearable device that delivers an anti-mitotic, anti-cancer therapy.

In addition, some products in development may compete with Cotara should they become approved for marketing. These products include, but are not limited to: Apocept, a fully human fusion protein, being developed by Apogenix GmbH, rindopepimut, a peptide vaccine under development by Celldex, and DCVax ® a dendritic cell-based vaccine being developed by Northwest Biotherapeutics. In addition, oncology products marketed for other indications such as Nexavar ® (Bayer/Onyx) are being tested in clinical trials for the treatment of brain cancer.

Research and Development

A major portion of our operating expenses to date is related to research and development. Research and development expenses primarily include (i) payroll and related costs associated with research and development personnel, (ii) costs related to clinical and preclinical testing of our technologies under development, (iii) costs to develop and manufacture the product candidates, including raw materials and supplies, product testing, depreciation, and facility related expenses, (iv) expenses for research services provided by universities and contract laboratories, including sponsored research funding, and (v) other research and development expenses. Research and development expenses were $24,306,000 in fiscal year 2013, $35,688,000 in fiscal year 2012, and $29,462,000 in fiscal year 2011.

Corporate Governance

Our Board is committed to legal and ethical conduct in fulfilling its responsibilities. The Board expects all directors, as well as officers and employees, to act ethically at all times and to adhere to the policies comprising the Company's Code of Business Conduct and Ethics. The Board of Directors (the "Board") of the Company adopted the corporate governance policies and charters. Copies of the following corporate governance documents are posted on our website and are available free of charge, at www.peregrineinc.com: (1) Peregrine Pharmaceuticals, Inc., Code of Business Conduct and Ethics (2) Peregrine Pharmaceuticals, Inc., Charter of the Nominating Committee of the Board of Directors, (3) Peregrine Pharmaceuticals, Inc., Charter of the Audit Committee of the Board of Directors, and (4) Peregrine Pharmaceuticals, Inc., Amended and Restated Charter of the Compensation Committee of the Board of Directors. If you would like a printed copy of any of these corporate governance documents, please send your request to Peregrine Pharmaceuticals, Inc., Attention: Corporate Secretary, 14282 Franklin Avenue, Tustin, California 92780.

Human Resources

As of April 30, 2013, we employed 182 full-time employees and five part-time employees. Each of our employees has signed a confidentiality agreement and none are covered by a collective bargaining agreement. We have never experienced employment-related work stoppages and consider our employee relations to be good.

Glossary of Terms

Adjuvant - An agent added to a drug to increase or aid its effect.

Antibody - Protein formed by the body to help defend against infection and disease.

Antibody Drug Conjugate ("ADC") – A targeted therapy consisting of an antibody linked to a payload drug.

Antigen - Any substance that antagonizes or stimulates the immune system to produce antibodies.

Bavituximab – A chimeric monoclonal antibody and our lead investigational product under our PS-targeting technology platform, currently in clinical development for the treatment of several solid tumor indications.

Chemotherapy - Treatment of disease by means of chemical substances or drugs.

Chimeric - A type of antibody that is mostly human and partially mouse.

cGMP - current Good Manufacturing Practices; regulations established by the FDA and/or other regulatory bodies for the manufacture, processing, packing, or holding of a drug to assure that such drug meets the requirements of the Federal Food, Drug and Cosmetic Act as to safety, and has the identity and strength and meets the quality and purity characteristics that it purports or is represented to possess.

Cotara ® - Cotara is a chimeric monoclonal antibody combined with Iodine 131 (radioisotope) that targets dead and dying cells found primarily at the core of a tumor.

Cytokine - A chemical messenger protein released by certain white blood cells. The cytokines include the interferons, the interleukins, tumor necrosis factor, and many others.

DNA (Deoxyribonucleic Acid) - A complex polynucleotide that is the carrier of genetic information.

European Medicines Agency ("EMA") - The European Medicines Agency is responsible for the scientific evaluation of medicines developed by pharmaceutical companies for use in the European Union.

Endothelial Cells - A layer of flat cells that line blood vessels.

FDA - the U.S. Food and Drug Administration; the government agency responsible for regulating the food, drug and cosmetic industries, including the commercial approval of pharmaceuticals in the U.S.

Glioblastoma multiforme - A type of brain tumor that forms from glial (supportive) tissue of the brain. Also called grade IV astrocytoma.

I-124 – A radioactive isotope of iodine emitting protons that can be used in positron emission tomography ("PET") imaging.

Immunotherapy – A t reatment that stimulates and/or suppresses certain components of the immune system to fight diseases such as cancer.

Investigational New Drug Application ("IND") - The application submitted to the FDA requesting permission to conduct human clinical trials.

Maximum Tolerated Dose - The highest nontoxic dose that can be reasonably given to patients.

Monoclonal antibody - Antibodies that have identical molecular structure and bind to a specific target. The inherent selectivity of monoclonal antibodies makes them ideally suited for targeting specific cells, such as cancer cells or certain viruses, while bypassing most normal tissue.

Necrosis or Necrotic - The death and degradation of cells within a tissue.

Oncology - The study and treatment of cancer.

Positron Emission Tomography (" PET" ) - A computerized radiographic technique that employs positron-emitting radioisotope to examine the metabolic activity of various body structures or physiological functions in the body.

Phospholipids - Phospholipids are normal cellular structures that are present in all cells of the human body and form the building blocks that make up the outer and inner surface of cells responsible for maintaining integrity and normal functions.

Preclinical - Generally refers to research that is performed in animals or tissues in the laboratory.

Protocol - A detailed plan for conducting a research study such as a clinical trial.

Radiolabeling - Process of attaching a radioactive isotope to a substance, such as a monoclonal antibody.

Recurrent - The return or flare-up of a condition thought to be cured or in remission.

Response Evaluation Criteria In Solid Tumors ("RECIST") - A set of published rules that define when cancer patients improve ("respond"), stay the same ("stable") or worsen ("progression") during treatments.

Solid tumors - Cancer cells which grow as a solid mass.

T-cells - A type of white blood cell that is of key importance to the immune system and is at the core of adaptive immunity, the system that tailors the body's immune response to specific pathogens.

This Annual Report on Form 10-K contains forward-looking information based on our current expectations. Because our actual results may differ materially from any forward-looking statements made by or on behalf of Peregrine, this section includes a discussion of important factors that could affect our actual future results, including, but not limited to, our potential product sales, potential royalties, contract manufacturing revenues, expenses, net income(loss) and earnings(loss) per common share.

If we cannot obtain additional funding, our product development and commercialization efforts may be reduced or discontinued and we may not be able to continue operations.

At April 30, 2013, we had $35,204,000 in cash and cash equivalents. We have expended substantial funds on the research and development of our product candidates, and funding the operations of Avid. As a result, we have historically experienced negative cash flows from operations since our inception and we expect the negative cash flows from operations to continue in the foreseeable future. Our net losses incurred during the past three fiscal years ended April 30, 2013, 2012 and 2011, amounted to $29,780,000, $42,119,000, and $34,151,000, respectively. Therefore, unless and until we are able to generate sufficient revenues from Avid's contract manufacturing services and/or from the sale and/or licensing of our products under development, we expect such losses to continue in the foreseeable future.

Therefore, our ability to continue to fund our clinical trials and development efforts is highly dependent on the amount of cash and cash equivalents on hand combined with our ability to raise additional capital to support our future operations through one or more methods, including but not limited to, issuing additional equity or debt.

Historically, we have funded a significant portion of our operations through the issuance of equity. During fiscal year 2013, we raised $40,754,000 in aggregate gross proceeds under two separate At Market Sales Issuance Agreements (as described in Note 6 to the accompanying consolidated financial statements). Subsequent to April 30, 2013 and through July 11, 2013, we raised an additional $12,729,000 in aggregate gross proceeds under an At Market Issuance Sales Agreement (as described in Note 6 to the accompanying consolidated financial statements). With these additional proceeds, we currently estimate that we have sufficient cash resources to meet our anticipated cash needs to fund our operations through at least fiscal year 2014 based on our current projections, which includes the initiation of our pivotal Phase III clinical trial of bavituximab combined with docetaxel in second-line NSCLC, projected cash inflows under signed contracts with existing customers of Avid and assuming we raise no additional capital from the capital markets or other potential sources.

However, our ability to continue to fund our clinical trials and development efforts in future years, including costs to fund our pivotal Phase III second-line NSCLC trial beyond fiscal year 2014, is highly dependent on our ability to raise additional capital to support our future operations through one or more methods, including but not limited to, financing our operations through the issuance of equity, securing new funding through the issuance of debt, licensing or partnering our products in development, or increasing revenue from our wholly-owned subsidiary, Avid. While we will continue to explore these potential opportunities, we may not be successful in securing debt financing, licensing or partnering our products in development, or generating additional revenue from Avid to complete the research, development, and clinical testing of our product candidates. Even if we are successful in obtaining debt financing, it may involve restrictive covenants on the operation of our business and require significant interest payments.

With respect to our ability to raise additional capital from the issuance of equity, as of July 11, 2013, we have an effective shelf registration statement on Form S-3, under which we may issue, from time to time, in one or more offerings, shares of our common stock for gross proceeds of up to $123,898,000. However, our ability to raise additional capital in the equity markets is dependent on a number of factors, including, but not limited to, the market demand for our common stock. The market demand or liquidity of our common stock is subject to a number of risks and uncertainties, including but not limited to, negative economic conditions, adverse market conditions, adverse clinical trial results, and significant delays in one or more clinical trials. If our ability to access the capital markets becomes severely restricted, it could have a negative impact on our business plans, including our clinical trial programs and other research and development activities. In addition, even if we are able to raise additional capital, it may not be at a price or on terms that are favorable to us.

We have had significant losses and we anticipate future losses.

We have incurred net losses in most fiscal years since we began operations in 1981. The following table represents net losses incurred for each of the past three fiscal years:

As of April 30, 2013, we had an accumulated deficit of $367,904,000. While we expect to continue to generate revenue from Avid's contract manufacturing services, in order to achieve and sustain profitable operations, we must successfully develop and obtain regulatory approval for our products, either alone or with others, and must also manufacture, introduce, market and sell our products. The costs associated with clinical trials and product manufacturing is very expensive and the time frame necessary to achieve market success for our products is long and uncertain. Furthermore, as evidenced by the increase in our net loss for fiscal years 2011 and 2012, during which we were conducting the majority of our Phase IIb trial in NSCLC, the costs associated with advanced stage clinical trials can significantly increase due, in part, to expanded patient populations and the cost to prepare for potential commercialization. We anticipate initiating our Phase III trial in NSCLC by the end of calendar year 2013, and therefore expect our net losses for fiscal year 2014 to exceed our net loss for fiscal year 2013. We do not expect to generate product or royalty revenues for at least the next two years, and we may never generate product and/or royalty revenues sufficient to become profitable or to sustain profitability.

The sale of substantial shares of our common stock may depress our stock price.

As of April 30, 2013, there were 143,768,946 shares of our common stock outstanding. Substantially all of these shares are eligible for trading in the public market, subject in some cases to volume and other limitations. The market price of our common stock may decline if our common stockholders sell a large number of shares of our common stock in the public market, or the market perceives that such sales may occur.

We could also issue up to 23,895,316 additional shares of our common stock that are reserved for future issuance under our stock incentive plans, employee stock purchase plan, and exercise of outstanding warrants, as further described in the following table:

In addition, the above table does not include shares of common stock we could potentially issue from time to time, in one or more offerings, under our current effective shelf registration statements in exchange for remaining aggregate gross proceeds of up to $136,628,000 as of April 30, 2013.

Of the total options and warrants outstanding as of April 30, 2013, 9,874,783 would be considered dilutive to stockholders because we would receive an amount per share, which is less than the market price of our common stock at April 30, 2013.

In addition, we will need to raise substantial additional capital in the future to fund our operations, including our planned Phase III trial for bavituximab in NSCLC. If we raise additional funds by issuing equity securities, the market price of our securities may decline and our existing stockholders may experience significant dilution.

We and certain of our executive officers and one consultant have been named as defendants in litigation that could result in substantial costs and divert management's attention.

On September 28, 2012, three complaints were filed in the U.S. District Court for the Central District of California (the "Court") against us and certain of our executive officers and one consultant (collectively, the "Individual Defendants") on behalf of certain purchasers of our common stock. The complaints were brought as purported stockholder class actions, and, in general, include allegations that we and the Individual Defendants violated (i) Section 10(b) of the Exchange Act, and Rule 10b-5 promulgated thereunder and (ii) Section 20(a) of the Exchange Act, by making materially false and misleading statements regarding the interim median overall survival results of our bavituximab Phase II second-line NSCLC trial, thereby artificially inflating the price of our common stock. The plaintiffs are seeking unspecified monetary damages and other relief. On February 5, 2013, the court appointed James T. Fahey as lead plaintiff in the action. The lead plaintiff filed an amended consolidated complaint on April 15, 2013. We filed a motion to dismiss the amended consolidated complaint on June 14, 2013. The lead plaintiff has until July 15, 2013, to file an answer to our motion to dismiss. A hearing before the Court on our motion to dismiss is scheduled for August 19, 2013.

There is no guarantee that we will be successful in defending the amended consolidated lawsuit. Also, our insurance coverage may be insufficient, our assets may be insufficient to cover any amounts that exceed our insurance coverage, and we may have to pay damage awards or otherwise may enter into settlement arrangements in connection with such claims. A settlement of the lawsuit could involve the issuance of common stock or other equity, which may dilute your ownership interest. Any payments or settlement arrangements could have material adverse effects on our business, operating results, financial condition or your ownership interest. Even if the lead plaintiff's claims are not successful, this litigation could result in substantial costs and significantly and adversely impact our reputation and divert management's attention and resources, which could have a material adverse effect on our business, operating results, financial condition or partnering efforts. In addition, such consolidated lawsuit may make it more difficult to finance our operations, obtain certain types of insurance (including directors' and officers' liability insurance), and attract and retain qualified executive officers, other employees and directors.

Our highly volatile stock price and trading volume may adversely affect the liquidity of our common stock.

The market price of our common stock and the market prices of securities of companies in the biotechnology sector have generally been highly volatile and are likely to continue to be highly volatile.

The following table shows the high and low sales price and trading volume of our common stock for each quarter in the three fiscal years ended April 30, 2013:

The market price of our common stock may be significantly impacted by many factors, including, but not limited to:

These and other external factors have caused and may continue to cause the market price and demand for our common stock to fluctuate substantially, which may limit or prevent investors from readily selling their shares of common stock, and may otherwise negatively affect the liquidity of our common stock.

The liquidity of our common stock will be adversely affected if our common stock is delisted from the NASDAQ Capital Market.

Our common stock is traded on The NASDAQ Capital Market. To maintain inclusion on The NASDAQ Capital Market, we must continue to meet the following six listing requirements:

If our common stock were ever delisted, we would apply to have our common stock quoted on the OTCQX, the world's largest interdealer quotation system, which is operated by OTC Market Groups, Inc. Upon any such delisting, our common stock would become subject to the regulations of the SEC relating to the market for penny stocks. A penny stock, as defined by the Penny Stock Reform Act, is any equity security not traded on a national securities exchange that has a market price of less than $5.00 per share. The penny stock regulations generally require that a disclosure schedule explaining the penny stock market and the risks associated therewith be delivered to purchasers of penny stocks and impose various sales practice requirements on broker-dealers who sell penny stocks to persons other than established customers and accredited investors. The broker-dealer must make a suitability determination for each purchaser and receive the purchaser's written agreement prior to the sale. In addition, the broker-dealer must make certain mandated disclosures, including the actual sale or purchase price and actual bid offer quotations, as well as the compensation to be received by the broker-dealer and certain associated persons. The regulations applicable to penny stocks may severely affect the market liquidity for our common stock and could limit your ability to sell your securities in the secondary market.

We do not intend to pay dividends on our common stock so any returns will be limited to the value of our stock.

We have never declared or paid any cash dividend on our common stock. We currently anticipate that we will retain future earnings for the development, operation and expansion of our business and do not anticipate declaring or paying any cash dividends for the foreseeable future. Any return to stockholders will therefore be limited to the appreciation of their stock.

Successful development of our product candidates is uncertain. To date, no revenues have been generated from the commercial sale of our product candidates and our product candidates may not generate revenues in the future.

Our development of current and future product candidates is subject to the risks of failure inherent in the development of new pharmaceutical products and products based on new technologies. These risks include:

Because of these risks, our research and development efforts or those of our partners may not result in any commercially viable products. If significant portions of these development efforts are not successfully completed, required regulatory approvals are not obtained, or any approved products are not commercially successful, our business, financial condition and results of operations may be materially harmed.

Because we have not begun the commercial sale of any of our product candidates, our revenue and profit potential is unproven and our operating history makes it difficult for an investor to evaluate our business and prospects. Our technology may not result in any meaningful benefits to our current or potential partners. No revenues have been generated from the commercial sale of our product candidates, and our products may not generate revenues in the future. Our business and prospects should be considered in light of the heightened risks and unexpected expenses and problems we may face as a company in an early stage of product development in an extremely competitive and rapidly evolving industry.

We are primarily focusing our activities and resources on the development of bavituximab and depend on its success.

We are focusing most of our near-term research and development activities and resources on bavituximab, and we believe a significant portion of the value of our Company relates to our ability to develop this drug candidate. The development of bavituximab is subject to many risks, including the risks discussed in other risk factors. If the results of clinical trials of bavituximab, including our planned Phase III trial in second-line NSCLC, the regulatory decisions affecting bavituximab, the anticipated or actual timing and plan for commercializing bavituximab, or, ultimately, the market acceptance of bavituximab do not meet our, your, analysts or others expectations, the market price of our common stock could be adversely affected.

Our product development efforts may not be successful.

Our product candidates have not received regulatory approval and are generally in research, preclinical and various clinical stages of development. If the results from any of the clinical trials are not positive, those results may adversely affect our ability to raise additional capital or obtain regulatory approval to conduct additional clinical trials, which will affect our ability to continue full-scale research and development for our antibody technologies. In addition, our product candidates may take longer than anticipated to progress through clinical trials, or patient enrollment in the clinical trials may be delayed or prolonged significantly, thus delaying the clinical trials. Patient enrollment is a function of many factors, including the size of the patient population, the nature of the protocol, the proximity of patients to the clinical sites, competing studies of other investigational products, and the inclusion and exclusion eligibility criteria for the study. In addition, because our Cotara product candidate represents a departure from more commonly used methods for cancer treatment, potential patients and their doctors may be inclined to use conventional therapies, such as chemotherapy, rather than enroll patients in any future clinical study.

Clinical trials required for our product candidates are expensive and time consuming, and their outcome is uncertain.

In order to obtain FDA approval to market a new drug product, we or our potential partners must demonstrate proof of safety and efficacy in humans. To meet these requirements, we or our potential partners will have to conduct extensive preclinical testing and "adequate and well-controlled" clinical trials. Conducting clinical trials is a lengthy, time-consuming and expensive process. The length of time may vary substantially according to the type, complexity, novelty and intended use of the product candidate, and often can be several years or more per trial. Delays associated with products for which we are directly conducting preclinical or clinical trials may cause us to incur additional operating expenses. Moreover, we may continue to be affected by delays associated with the preclinical testing and clinical trials of certain product candidates conducted by our partners over which we have no control. The commencement and rate of completion of clinical trials may be delayed by many factors, including, for example:

Even if we obtain positive results from preclinical or initial clinical trials, we may not achieve the same success in future trials. Clinical trials may not demonstrate statistically sufficient safety and effectiveness to obtain the requisite regulatory approvals for product candidates employing our technology.

Clinical trials that we conduct or that third parties conduct on our behalf may not demonstrate sufficient safety and efficacy to obtain the requisite regulatory approvals for any of our product candidates. We expect to commence new clinical trials from time to time in the course of our business as our product development work continues. The failure of clinical trials to demonstrate safety and effectiveness for our desired indications could harm the development of that product candidate as well as other product candidates. Any change in, or termination of, our clinical trials could materially harm our business, financial condition and results of operations.

We rely on third-parties to conduct our clinical trials and many of our preclinical studies. If those parties do not successfully carry out their contractual duties or meet expected deadlines, our drug candidates may not advance in a timely manner or at all.

In the course of our discovery, preclinical testing and clinical trials, we rely on third parties, including universities, investigators and clinical research organizations, to perform critical services for us. For example, we rely on third parties to conduct our clinical trials and many of our preclinical studies. CROs and investigators are responsible for many aspects of the trials, including finding and enrolling patients for testing and administering the trials. Certain of our clinical trials are blind or double-blind, including the planned Phase III clinical trial in second-line NSCLC. If the trial is blind, management does not have access to information regarding the trials' administration and progress. We therefore must rely on third parties to conduct our clinical trials, but their failure to comply with all regulatory and contractual requirements, or to perform their services in a timely and acceptable manner, may compromise our clinical trials in particular or our business in general. Although we rely on these third parties to conduct our clinical trials, we are responsible for ensuring that each of our clinical trials is conducted in accordance with its investigational plan and protocol.

Moreover, the FDA and foreign regulatory authorities require us to comply with regulations and standards, commonly referred to as good clinical practices, or GCPs, for conducting, monitoring, recording and reporting the results of clinical trials to ensure that the data and results are scientifically credible and accurate and that the trial subjects are adequately informed of the potential risks of participating in clinical trials. Our reliance on third parties does not relieve us of these responsibilities and requirements. These third parties may not be available when we need them or, if they are available, may not comply with all regulatory and contractual requirements or may not otherwise perform their services in a timely or acceptable manner. Any failings by these third parties may compromise our clinical trials in particular or our business in general. Similarly, we may need to enter into new arrangements with alternative third parties and our clinical trials may be extended, delayed or terminated. These independent third parties may also have relationships with other commercial entities, some of which may compete with us. For example, if such third parties fail to perform their obligations in compliance with our clinical trial protocols, our clinical trials may not meet regulatory requirements or may need to be repeated. As a result of our dependence on third parties, we may face delays or failures outside of our direct control, as evidenced by the major discrepancies in treatment group coding by an independent third-party vendor responsible for distribution of blinded investigational product used in our bavituximab Phase II NSCLC trial. These risks also apply to the development activities of our collaborators, and we do not control our collaborators' research and development, clinical trials or regulatory activities. We do not expect any drugs resulting from our collaborators' research and development efforts to be commercially available for many years, if ever.

In addition, we have prepaid research and development expenses to third parties that have been deferred and capitalized as pre-payments to secure the receipt of future preclinical and clinical research and development services. These pre-payments are recognized as an expense in the period that the services are performed. We assess our prepaid research and development expenses for impairment when events or changes in circumstances indicate that the carrying amount of the prepaid expense may not be recoverable or provide a future economic benefit, including the risk of third party nonperformance. If there are indicators that the third parties are unable to perform the research and development services, we may be required to take an impairment charge.

We do not have experience as a company conducting large-scale clinical trials, or in other areas required for the successful commercialization and marketing of our product candidates.

Results from early stage clinical trials of bavituximab and Cotara may not be indicative of successful outcomes in later stage trials. Negative or limited results from any current or future clinical trial could delay or prevent further development of our product candidates, which would adversely affect our business.

We have no experience as a company in conducting large-scale, late-stage clinical trials, and our experience with early-stage clinical trials with small numbers of patients is limited. In part because of this limited experience, we cannot be certain that planned clinical trials will begin or be completed on time, if at all. Large-scale trials would require significant additional financial and management resources, and reliance on third-party clinical investigators, CROs or consultants. Relying on third-party clinical investigators or CROs may force us to encounter delays that are outside of our control. Any such delays could have a material adverse effect on our business.

We also do not currently have marketing, sales and distribution capabilities for our product candidates. Developing an internal sales and distribution capability would be an expensive and time-consuming process. We may enter into agreements with third parties that would be responsible for marketing and distribution. However, these third parties may not be capable of successfully selling any of our product candidates. The inability to commercialize and market our product candidates could materially affect our business.

Failure to recruit, enroll and retain patients for clinical trials may cause the development of our product candidates to be delayed or development costs to increase substantially.

We have experienced, and expect to experience in the future, delays in patient enrollment in our clinical trials for a variety of reasons. The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the study until its conclusion. The enrollment of subjects depends on many factors, including:

Our clinical trials compete with other clinical trials for product candidates that are in the same therapeutic areas as our product candidates, and this competition reduces the number and types of subjects available to us, because some patients who might have opted to enroll in our trials opt to enroll in a trial being conducted by one of our competitors. Since the number of qualified clinical investigators is limited, we conduct some of our clinical trials at the same clinical trial sites that some of our competitors use, which reduces the number of subjects who are available for our clinical trials in such clinical trial site. Delays in patient enrollment in the future as a result of these and other factors may result in increased costs or may affect the timing or outcome of our clinical trials, which could prevent us from completing these trials and adversely affect our ability to advance the development of our product candidates.

Patient enrollment and patient care provided at international clinical sites may be delayed or otherwise adversely impacted by social, political and economic factors affecting the particular foreign country.

In the past we have conducted, and intend to conduct in the future, clinical trials globally including clinical sites in Eastern Europe and other countries. Our ability to successfully initiate, enroll and complete a clinical trial in any foreign country is subject to numerous risks unique to conducting business in foreign countries, including:

Because we intend in the future to conduct clinical trials in foreign counties, any disruption to our international clinical trial sites could significantly delay or jeopardize our product development efforts in those areas.

Success in early clinical trials may not be indicative of results obtained in later trials.

A number of new drugs and biologics have shown promising results in initial clinical trials, but subsequently failed to establish sufficient safety and effectiveness data to obtain necessary regulatory approvals. Data obtained from preclinical and clinical activities are subject to varying interpretations, which may delay, limit or prevent regulatory approval.

Data from our preclinical studies and Phase I and Phase II clinical trials should not be relied upon as evidence that later or larger-scale clinical trials will succeed. The Phase I studies we have completed to date have been designed to primarily assess safety in a small number of patients. In addition, the results we have obtained in the Phase II trials may not predict results for any future studies and may not predict future therapeutic benefit of our drug candidates. We will be required to demonstrate through larger-scale clinical trials that bavituximab and Cotara are safe and effective for use in a diverse population before we can seek regulatory approval for their commercial sale. There is typically an extremely high rate of attrition from the failure of drug candidates proceeding through clinical trials.

In addition, regulatory delays or rejections may be encountered as a result of many factors, including changes in regulatory policy during the period of product development.

If we successfully develop products but those products do not achieve and maintain market acceptance, our business will not be profitable.

Even if the FDA or other regulatory authorities approve bavituximab, Cotara, or any future product candidate for commercial sale, the degree of market acceptance of any approved product candidate by physicians, healthcare professionals and third-party payors and our profitability and growth will depend on a number of factors, including:

In addition, if bavituximab, Cotara, or any future product candidate that we discover and develop does not provide a treatment regimen that is more beneficial than the current standard of care or otherwise provide patient benefit, that product likely will not be accepted favorably by the market. If any products we may develop do not achieve market acceptance, then we may not generate sufficient revenue to achieve or maintain profitability.

In addition, even if our products achieve market acceptance, we may not be able to maintain that market acceptance over time if new products or technologies are introduced that are more favorably received than our products, are more cost effective or render our products obsolete.

If we do not establish additional collaborations, we may have to alter our development plans.

Our drug development programs and potential commercialization of our drug candidates will require substantial additional cash to fund expenses. We either own or we in-licensed all rights to our two lead drug candidates, bavituximab and Cotara, and are fully responsible for the associated development costs. Our strategy continues to include the potential of selectively collaborating with leading pharmaceutical and biotechnology companies to assist us in furthering development and potential commercialization of some of our drug candidates and research programs. We may enter into one or more of such collaborations in the future, especially for target indications in which the potential collaborator has particular therapeutic expertise or that involve a large, primary care market that must be served by large sales and marketing organizations or for markets outside of North America. We face significant competition in seeking appropriate collaborators and these collaborations are complex and time-consuming to negotiate and document. We may not be able to negotiate collaborations on acceptable terms, or at all. Even if we successfully enter into a collaboration, our partner may not perform its contractual obligations or may terminate the agreement. If that were to occur, we may have to curtail the development of a particular drug candidate, reduce or delay its development program or one or more of our other development programs, delay its potential commercialization or reduce the scope of our sales or marketing activities, or increase our expenditures and undertake development or commercialization activities at our own expense. If we elect to increase our expenditures to fund development or commercialization activities on our own, we may need to obtain additional capital, which may not be available to us on acceptable terms, or at all. If we do not have sufficient funds, we will not be able to bring our drug candidates to market and generate product revenue.

Healthcare reform measures and other statutory or regulatory changes could adversely affect our business.

In both the U.S. and certain foreign jurisdictions, there have been a number of legislative and regulatory proposals to change the healthcare system in ways that could impact our business. For example, the Patient Protection and Affordable Care Act and the Health Care and Education Affordability Reconciliation Act of 2010 (collectively, the"ACA"), enacted in March 2010, substantially changes the way healthcare is financed by both governmental and private insurers, and significantly impacts the pharmaceutical industry. With regard to pharmaceutical products, among other things, the ACA is expected to expand and increase industry rebates for drugs covered under Medicaid programs and make changes to the coverage requirements under the Medicare D program.  

The pharmaceutical and biotechnology industries are subject to extensive regulation, and from time to time legislative bodies and governmental agencies consider changes to such regulations that could have significant impact on industry participants. For example, in light of certain highly-publicized safety issues regarding certain drugs that had received marketing approval, the U.S. Congress has considered various proposals regarding drug safety, including some which would require additional safety studies and monitoring and could make drug development more costly. We are unable to predict what additional legislation or regulation, if any, relating to safety or other aspects of drug development may be enacted in the future, or what effect such legislation or regulation would have on our business.

The coverage and reimbursement status of newly approved drugs is uncertain, and failure to obtain adequate coverage and reimbursement could limit our ability to market bavituximab and cotara and may decrease our ability to generate revenue.

There is significant uncertainty related to the third party coverage and reimbursement of newly approved drugs both nationally and internationally. The commercial success of bavituximab, Cotara, and any other of our future products, if any, in both domestic and international markets depends on whether third-party coverage and reimbursement is available for the ordering of our future products by the medical profession for use by their patients. Medicare, Medicaid, health maintenance organizations and other third-party payors are increasingly attempting to manage healthcare costs by limiting both coverage and the level of reimbursement of new drugs and, as a result, they may not cover or provide adequate payment for our future products. These payors may not view our future products as cost-effective, and reimbursement may not be available to consumers or may not be sufficient to allow our future products to be marketed on a competitive basis. Likewise, legislative or regulatory efforts to control or reduce healthcare costs or reform government healthcare programs could result in lower prices or rejection of our future products. Changes in coverage and reimbursement policies or healthcare cost containment initiatives that limit or restrict reimbursement for our future products may reduce any future product revenue.

Failure to obtain regulatory approval in foreign jurisdictions will prevent us from marketing bavituximab abroad.

We intend to market bavituximab in international markets either directly or through a potential future collaboration partner, if any. In order to market bavituximab in the European Union, Canada, Japan and many other foreign jurisdictions, we or a potential future collaboration partner must obtain separate regulatory approvals. We have, and potential future collaboration partners may have, had limited interactions with foreign regulatory authorities, and the approval procedures vary among countries and can involve additional testing at significant cost. The time required to obtain approval may differ from that required to obtain FDA approval. Approval by the FDA does not ensure approval by regulatory authorities in other countries, and approval by one foreign regulatory authority does not ensure approval by regulatory authorities in other foreign countries or by the FDA. The foreign regulatory approval processes may include all of the risks associated with obtaining FDA approval. We or a potential future collaboration partner may not obtain foreign regulatory approvals on a timely basis, if at all. We or a potential future collaboration partner may not be able to file for regulatory approvals and may not receive necessary approvals to commercialize bavituximab or any other future products in any market.

Foreign governments often impose strict price controls, which may adversely affect our future profitability.

We intend to seek approval to market bavituximab in both the U.S. and foreign jurisdictions either directly or through a potential future collaboration partner. If we or a potential future collaboration partner obtain approval in one or more foreign jurisdictions, we or a potential future collaboration partner will be subject to rules and regulations in those jurisdictions relating to bavituximab. In some foreign countries, particularly in the European Union, prescription drug pricing is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a drug candidate. To obtain reimbursement or pricing approval in some countries, we or a potential future collaboration partner may be required to conduct a clinical trial that compares the cost-effectiveness of bavituximab to other available therapies. If reimbursement of bavituximab is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, we may be unable to achieve or sustain profitability.

If we cannot license or sell Cotara, it may be delayed or never be further developed in the U.S.

We have completed a single-arm Phase II study with Cotara for the treatment of brain cancer. In our most recent Phase II open-label, multicenter trial, 41 patients with GBM at first relapse were enrolled and received a single-treatment with Cotara. Median overall survival for patients treated with Cotara was 9.3 months. Based on these data and data from earlier clinical studies, we have reached an agreement with the FDA on the design of a single pivotal trial to potentially support product registration for Cotara. With this clear clinical path forward, we are actively pursuing a licensing or funding partner to further advance the program. In the event we are not able to secure a partnership for the program in the U.S., we may not be able to advance the project past its current stage of development. Because there are a limited number of companies, which have the financial resources, the internal infrastructure, the technical capability and the marketing infrastructure to develop and market a radiopharmaceutical-based oncology drug, we may not secure a suitable partner for Cotara. Furthermore, we cannot ensure that if we do secure a suitable licensing partner for the program, the financial terms that they propose will be acceptable to us.

Obtaining Fast Track designation from the FDA for our drug candidate Cotara does not guarantee faster approval.

We received Fast Track designation for our drug candidate Cotara for the treatment of GBM. Fast track designation is a process designed to facilitate the development and expedite the review of new drugs intended to treat serious or life-threatening diseases or conditions and that have the potential to address an unmet medical need for such disease or condition. Fast Track designation applies to the product and the specific indication for which it is being studied. Once a Fast Track designation is obtained, the FDA may consider for review on a rolling basis sections of the NDA before the complete application is submitted if the applicant provides and the FDA approves a schedule for the submission of the sections of the NDA and the applicant pays applicable user fees upon submission of the first section of the NDA. However, the time period specified in the Prescription Drug User Fee Act, which governs the time period goals the FDA has committed to reviewing an application, does not begin until the complete application is accepted for filing. Although we received Fast Track designation for Cotara, the FDA may later decide that Cotara no longer meets the conditions for qualification. In addition, Fast Track designation may not provide us with a material commercial advantage.

Our manufacturing facilities may not continue to meet regulatory requirements and have limited capacity.

Before approving a new drug or biologic product, the FDA requires that the facilities at which the product will be manufactured comply with cGMP, requirements. To be successful, our therapeutic products must be manufactured for development and, following approval, in commercial quantities, in compliance with regulatory requirements and at acceptable costs. Currently, we manufacture all preclinical and clinical material through Avid, our wholly-owned subsidiary. While we believe our current facilities are adequate for the manufacturing of product candidates for clinical trials, our facilities may not be adequate to produce sufficient quantities required for commercialization.

In order to prepare for commercialization, if it is approved for sale, we may need to manufacture bavituximab in larger quantities beyond our current capacity. We may not be able to successfully increase the manufacturing capacity for bavituximab, whether at Avid or in collaboration with third-party manufacturers, in a timely or cost-effective manner or at all. Significant scale-up of manufacturing is a lengthy process and may require additional validation studies, which are costly and which the FDA must review and approve. In addition, quality issues may arise during those scale-up activities because of the inherent properties of monoclonal antibodies, like bavituximab. If we are unable to successfully scale-up manufacture of bavituximab in sufficient quality and quantity, whether at Avid or a third-party manufacturer, the development of bavituximab and its regulatory approval or commercial launch may be delayed or there may be a shortage in supply, which could significantly harm our business. If we engage a third-party manufacturer, we would need to transfer our technology to that third-party manufacturer and gain FDA approval, potentially causing delays in product delivery. In addition, if we use a third-party manufacturer, it may not perform as agreed or may terminate its agreement with us.

We may also encounter problems with the following:

In addition, we or any third-party manufacturer will be required to register the manufacturing facilities with the FDA and other regulatory authorities, provided it had not already registered. The facilities will be subject to inspections confirming compliance with cGMP or other regulations. If we or any of our third-party manufacturers fail to maintain regulatory compliance, the FDA can impose regulatory sanctions including, among other things, refusal to approve a pending application for a new drug product or biologic product, or revocation of a pre-existing approval. As a result, our business, financial condition and results of operations may be materially harmed.

If we use hazardous and biological materials in a manner that causes injury or violates applicable law, we may be liable for damages.

Our clinical trials, research and development activities and manufacturing operations involve the controlled use of hazardous materials and chemicals. We are subject to federal, state and local laws and regulations in the U.S. governing the use, manufacture, storage, handling and disposal of hazardous materials and chemicals. Although we believe that our procedures for using, handling, storing and disposing of these materials comply with legally prescribed standards, we may incur significant additional costs to comply with applicable laws in the future. Also, even if we are in compliance with applicable laws, we cannot completely eliminate the risk of contamination or injury resulting from hazardous materials or chemicals. As a result of any such contamination or injury, we may incur liability or local, city, state or federal authorities may curtail the use of these materials and interrupt our business operations. In the event of an accident, we could be held liable for damages or penalized with fines, and the liability could exceed our resources. Compliance with applicable environmental laws and regulations is expensive, and current or future environmental regulations may impair our research, development and production efforts, which could harm our business, prospects, financial condition or results of operations.

We may have significant product liability exposure because we maintain only limited product liability insurance.

We face an inherent business risk of exposure to product liability claims in the event that the administration of one of our drugs during a clinical trial adversely affects or causes the death of a patient. Although we maintain product liability insurance for clinical studies in the amount of $5,000,000 per occurrence or $5,000,000 in the aggregate on a claims-made basis, this coverage may not be adequate. Product liability insurance is expensive, difficult to obtain and may not be available in the future on acceptable terms, if at all. Our inability to obtain sufficient insurance coverage on reasonable terms or to otherwise protect against potential product liability claims in excess of our insurance coverage, if any, or a product recall, could negatively impact our financial position and results of operations.

In addition, the contract manufacturing services that we offer through Avid expose us to an inherent risk of liability as the antibodies or other substances manufactured by Avid, at the request and to the specifications of our customers, could possibly cause adverse effects or have product defects. We obtain agreements from our customers indemnifying and defending us from any potential liability arising from such risk. However, these indemnification agreements may not adequately protect us against potential claims relating to such contract manufacturing services or protect us from being named in a possible lawsuit. Although Avid has procured insurance coverage, we may not be able to maintain our existing coverage or obtain additional coverage on commercially reasonable terms, or at all, or such insurance may not provide adequate coverage against all potential claims to which we might be exposed. A partially successful or completely uninsured claim against Avid would have a material adverse effect on our consolidated operations .

Our research and development activities rely on technology licensed from third parties, and termination of any of those licenses would result in loss of significant rights to develop and market our products, which would impair our business, prospects, financial condition and results of operations.

We have been granted rights to a variety of technologies necessary for our research and development activities from third parties through license agreements. Each license generally may be terminated by the licensor if we fail to perform our obligations under the agreement, including obligations to develop the drug candidates or technologies under license. If terminated, we would lose the right to develop the drug candidates, which could adversely affect our business, prospects, financial condition and results of operations. The license agreements also generally require us to meet specified milestones or show reasonable diligence in development of the technology. If disputes arise over the definition of these requirements or whether we have satisfied the requirements in a timely manner, or if any other obligations in the license agreements are disputed by the other party, the other party could terminate the agreement, and we could lose our rights to develop the licensed technology.

In addition, if new technology is developed from these licenses, we may be required to negotiate certain key financial and other terms, such as milestone and royalty payments, for the licensing of this future technology with the third party licensors, and it might not be possible to obtain any such license on terms that are satisfactory to us, or at all.

If we are unable to obtain, protect and enforce our patent rights, we may be unable to effectively protect or exploit our proprietary technology, inventions and improvements.

Our success depends in part on our ability to obtain, protect and enforce commercially valuable patents. We try to protect our proprietary positions by filing U.S. and foreign patent applications related to our proprietary technology, inventions and improvements that are important to developing our business. However, if we fail to obtain and maintain patent protection for our proprietary technology, inventions and improvements, our competitors could develop and commercialize products that would otherwise infringe upon our patents.

Our patent position is generally uncertain and involves complex legal and factual questions. Legal standards relating to the validity and scope of claims in the biotechnology and biopharmaceutical fields are still evolving. Accordingly, the degree of future protection for our patent rights is uncertain. The risks and uncertainties that we face with respect to our patents include the following:

We may become involved in lawsuits to protect or enforce our patents that would be expensive, time consuming and may lead to disclosure of our confidential information.

In order to protect or enforce our patent rights, we may initiate patent litigation against third parties. In addition, we may become subject to interference or opposition proceedings conducted in patent and trademark offices to determine the priority and patentability of inventions. The defense of intellectual property rights, including patent rights through lawsuits, interference or opposition proceedings and other legal and administrative proceedings, would be costly and divert our technical and management personnel from their normal responsibilities. An adverse determination of any litigation or defense proceedings could put our pending patent applications at risk of not being issued.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation. For example, during the course of this kind of litigation, confidential information may be inadvertently disclosed in the form of documents or testimony in connection with discovery requests, depositions or trial testimony. This disclosure could have a material adverse effect on our business and our financial results.

Business disruptions could seriously harm our future revenues and financial condition and increase our costs and expenses.

Our operations could be subject to earthquakes, power shortages, telecommunications failures, water shortages, floods, fires, extreme weather conditions, medical epidemics and other natural or manmade disasters or business interruptions, for which we have limited insurance or are predominantly self-insured. The occurrence of any of these business disruptions could seriously harm our operations and financial condition and increase our costs and expenses. Our ability to obtain raw materials for the manufacture of our clinical supplies and for our third party customers' products, for which we act as a contract manufacturer, could be disrupted, if the operations of these suppliers is affected by a man-made or natural disaster or other business interruption. Our corporate headquarters and manufacturing facility is located in California near major earthquake faults. The ultimate impact on us, our significant suppliers and our general infrastructure of being located near major earthquake faults and being consolidated in certain geographical areas is unknown, but our operations and financial condition could suffer in the event of a major earthquake or other natural disaster.

We may not be able to compete with our competitors in the Biotechnology Industry because many of them have greater resources than we do and they are further along in their development efforts.

The pharmaceutical and biotechnology industry is intensely competitive and subject to rapid and significant technological change. Many of the drugs that we are attempting to discover or develop will be competing with existing therapies. In addition, we are aware of several pharmaceutical and biotechnology companies actively engaged in research and development of antibody-based products that have commenced clinical trials with, or have successfully commercialized, antibody products. Some or all of these companies may have greater financial resources, larger technical staffs and larger research budgets than we have, as well as greater experience in developing products and running clinical trials. We expect to continue to experience significant and increasing levels of competition in the future. In addition, there may be other companies which are currently developing competitive technologies and products or which may in the future develop technologies and products that are comparable or superior to our technologies and products.

Bavituximab is currently in clinical trials for the treatment of advanced solid tumors, including NSCLC. Although we are not aware of any other monoclonal antibodies in clinical development targeting PS as a potential therapy for advanced solid tumors, there are a number of possible competitors with approved or developmental targeted agents used alone or in combination with standard chemotherapy for the treatment of cancer, including but not limited to, Abraxane by Celegene, Afatinib and Vargatef by Boehringer Ingelheim, Avastin ® (bevacizumab) and onartuzumab by Roche, Erbitux ® (Cetuximab) by Eli Lilly and Company and Bristol-Myers Squibb Company, ganetespib by Synta Pharmaceuticals, Herceptin® (trastuzumab) by Roche, Rituxan ® (rituximab) and Tarceva ® (erlotinib) by OSI Pharmaceuticals, Inc. and Roche, Xalkori ® (crizotinib) by Pfizer, and Yervoy ® (ipilimumab) and nivolumab by Bristol-Myers Squibb Company. Additional possible competitors also exist with approved or developmental immunotherapies including but not limited to AMP-224 by GlaxoSmithKline , lambrolizumab by Merck & Co., MEDI-4736 by AstraZeneca, pidilizumab by Curetech, RD7466 by Roche and other Active Cellular Immunotherapy candidates by Dendreon and Astuprotimut-r by GlaxoSmithKline . There are a significant number of companies developing cancer therapeutics using a variety of targeted and non-targeted approaches. A direct comparison of these potential competitors will not be possible until bavituximab advances to later-stage clinical trials.

We are developing Cotara for the treatment of recurrent GBM, the most aggressive form of brain cancer. Since Cotara is a single-treatment approach that targets brain tumors from the inside out, it is a novel treatment dissimilar from other drugs approved or in development for this disease. Approved treatments for brain cancer include the Gliadel ® Wafer (polifeprosan 20 with carmustine implant) from Eisai, Inc., Temodar ® (temozolomide) from Merck, Avastin ® (bevacizumab) from Roche, and the NovoTTF-100A System by Novocure. Gliadel ® Wafers are inserted in the tumor cavity following surgical resection and releases a chemotherapeutic agent over time. Temodar ® is administered orally to patients with brain cancer. Avastin ® is a monoclonal antibody that targets VEGFto prevent the formation of new tumor blood vessels. The NovoTTF-100A system is a portable, wearable device that delivers an anti-mitotic, anti-cancer therapy.

In addition, some products in development may compete with Cotara should they become approved for marketing. These products include, but are not limited to: Apocept, a fully human fusion protein, being developed by Apogenix GmbH, rindopepimut, a peptide vaccine under development by Celldex, and DCVax ® a dendritic cell-based vaccine being developed by Northwest Biotherapeutics. In addition, oncology products marketed for other indications such as Nexavar ® (Bayer/Onyx) are being tested in clinical trials for the treatment of brain cancer.

Avid Bioservices, Inc., our subsidiary, is exposed to risks resulting from its small customer base.

A significant portion of Avid's revenues has historically been derived from a small number of customers. These customers typically do not enter into long-term contracts because their need for drug supply depends on a variety of factors, including the drug's stage of development, their financial resources, and, with respect to commercial drugs, demand for the drug in the market. Our results of operations could be adversely affected if revenue from any one of our primary customers is significantly reduced or eliminated.

If we lose qualified management and scientific personnel or are unable to attract and retain such personnel, we may be unable to successfully develop our products or we may be significantly delayed in developing our products.

Our success is dependent, in part, upon a limited number of key executive officers, each of whom is an at-will employee, and upon our scientific researchers. For example, because of his extensive understanding of our technologies and product development programs, the loss of Mr. Steven W. King, our President & Chief Executive Officer and Director, would adversely affect our development efforts and clinical trial programs during the six to twelve month period that we estimate it would take to find and train a qualified replacement.

We also believe that our future success will depend largely upon our ability to attract and retain highly-skilled research and development and technical personnel. We face intense competition in our recruiting activities, including competition from larger companies with greater resources. We do not know if we will be successful in attracting or retaining skilled personnel. The loss of certain key employees or our inability to attract and retain other qualified employees could negatively affect our operations and financial performance.

We have federal and state net operating loss ("NOL") carryforwards which, if we were to become profitable, could be used to offset/defer federal and state income taxes. Our ability to use such carryforwards to offset future taxable income may be subject to certain limitations related to changes in ownership of our stock.

As of April 30, 2013, we had federal and state NOL carryforwards of approximately $266 million and $203 million, respectively, expiring from 2014 to 2033. These NOL carryforwards could potentially be used to offset certain future federal and state income tax liabilities. However, utilization of NOL carryforwards may be subject to a substantial annual limitation pursuant to Section 382 of the Internal Revenue Code of 1986, as amended, as well as similar state provisions due to ownership changes that have occurred previously or that could occur in the future. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain stockholders or public groups in the stock of a corporation by more than 50 percentage points over a three-year period. We performed a detailed analysis of our NOL carryforwards through April 30, 2013 and it was determined that no change in ownership had occurred. As a result of this analysis, we currently do not believe any Section 382 limitations will significantly impact our ability to offset income with available NOL carryforwards. However, future ownership changes under Section 382 may limit our ability to fully utilize these tax benefits. Any limitation may result in expiration of a portion of the carryforwards before utilization. If we were not able to utilize our carryforwards, we would be required to use our cash resources to pay taxes that would otherwise have been offset, thereby reducing our liquidity.

Our Governance Documents and State Law provide certain anti-takeover measures which will discourage a third party from seeking to acquire us unless approved by the Board of Directors.

We adopted a shareholder rights plan, commonly referred to as a "poison pill," on March 16, 2006. The purpose of the shareholder rights plan is to protect stockholders against unsolicited attempts to acquire control of us that do not offer a fair price to our stockholders as determined by our Board of Directors. Under the plan, the acquisition of 15% or more of our outstanding common stock by any person or group, unless approved by our board of directors, will trigger the right of our stockholders (other than the acquirer of 15% or more of our common stock) to acquire additional shares of our common stock, and, in certain cases, the stock of the potential acquirer, at a 50% discount to market price, thus significantly increasing the acquisition cost to a potential acquirer. In addition, our certificate of incorporation and by-laws contain certain additional anti-takeover protective devices. For example,

Further, we are subject to Section 203 of the Delaware General Corporation Law, which, subject to certain exceptions, restricts certain transactions and business combinations between a corporation and a stockholder owning 15% or more of the corporation's outstanding voting stock for a period of three years from the date the stockholder becomes a 15% stockholder.

Although we believe these provisions and our rights plan collectively provide for an opportunity to receive higher bids by requiring potential acquirers to negotiate with our Board of Directors, they would apply even if the offer may be considered beneficial by some stockholders. In addition, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our Board of Directors, which is responsible for appointing the members of our management.

Not applicable.

Our corporate office, research and development, and manufacturing facilities are located in Tustin, California. We lease an aggregate of approximately 61,000 square feet of office, research and manufacturing space in three adjacent buildings under two separate lease agreements with an aggregate monthly rent expense of approximately $78,000. Both lease agreements initially expire in December 2017, however, our lease agreement associated with two of our leased buildings includes two five-year options to extend the lease through December 2027, while our lease agreement associated with the third leased building includes a five-year option to extend the lease through December 2022. We believe our facilities are adequate for our current needs and that suitable additional substitute space would be available if needed.

In the ordinary course of business, we are at times subject to various legal proceedings and disputes. Except as set forth below, we currently are not aware of any material litigation or other dispute nor, to management's knowledge, is any litigation or other proceeding threatened against us that collectively is expected to have a material adverse effect on our consolidated cash flows, financial condition or results of operations.

Securities Related Class Action Lawsuit

On September 28, 2012, three complaints were filed in the U.S. District Court for the Central District of California against us and certain of our executive officers and one consultant (collectively, the "Individual Defendants") on behalf of certain purchasers of our common stock. The complaints have been brought as purported stockholder class actions, and, in general, include allegations that we and the Individual Defendants violated (i) Section 10(b) of the Exchange Act, and Rule 10b-5 promulgated thereunder and (ii) Section 20(a) of the Exchange Act, by making materially false and misleading statements regarding the interim median overall survival results of our bavituximab Phase II second-line NSCLC trial, thereby artificially inflating the price of our common stock. The plaintiffs are seeking unspecified monetary damages and other relief. On November 27, 2012, four prospective lead plaintiffs filed motions to consolidate, appoint a lead plaintiff and appoint lead counsel. On February 5, 2013, the court appointed James T. Fahey as lead plaintiff in the action. The lead plaintiff filed an amended consolidated complaint on April 15, 2013. We filed a motion to dismiss the amended consolidated complaint on June 14, 2013. The lead plaintiff has until July 15, 2013, to file an answer to our motion to dismiss. A hearing before the court on our motion to dismiss is scheduled for August 19, 2013. We believe that the class action lawsuit is without merit, and we intend to vigorously defend the action and are seeking dismissal of the complaint. Due to the early stage of the proceeding, we believe that the probability of an unfavorable outcome or loss related to the proceeding and an estimate of the amount or range of loss related to the claims, if any, from an unfavorable outcome is not determinable at this time.

Federal Shareholder Derivative Lawsuit

On May 9, 2013, an alleged shareholder filed in the U.S. District Court for the Central District of California a derivative lawsuit purportedly on behalf of the Company against certain of our executive officers and directors, captioned Michael Roy, Derivatively on Behalf of Nominal Defendant Peregrine Pharmaceuticals, Inc. v. Steven W. King , et al . The complaint asserts claims for breach of fiduciary duty, abuse of control, gross mismanagement, waste of corporate assets and unjust enrichment arising from substantially similar factual allegations as those contained in the consolidated securities class action described above. This case was subsequently transferred to the same court and judge handling the securities class action lawsuit discussed above. On May 31, 2013, the judge issued an order staying of this derivative litigation pending the resolution of our motion to dismiss in the securities class action.

Other Legal Matters

On September 24, 2012, we filed a lawsuit against Clinical Supplies Management, Inc. ("CSM"), in the U.S. District Court for the Central District of California. We had contracted with CSM in 2010 as our third-party vendor responsible for distribution of the blinded investigational product used in our bavituximab Phase II second-line NSCLC trial. As part of the routine collection of data in advance of an end-of-Phase II meeting with regulatory authorities, we discovered major discrepancies between some patient sample test results and patient treatment code assignments. Consequently, we filed this lawsuit against CSM alleging breach of contract, negligence and negligence per se arising from CSM's performance of its contracted services. We are seeking monetary damages. On March 7, 2013, we and CSM submitted to the court a proposed stipulation pursuant to which the lawsuit would be stayed for up to 120 days during which time we and CSM would participate in an alternative dispute resolution process, pursuant to our contract with CSM.  The proposed stipulation was approved by the court on March 8, 2013. On June 26, 2013, we and CSM engaged in an alternative dispute resolution session that did not result in any resolution of our dispute. The aforementioned stay expired on July 6, 2013. We have agreed to allow CSM until July 19, 2013 to respond to our complaint.

Not applicable.

PART II

(a) Market Information. We are listed on The NASDAQ Capital Market under the stock trading symbol "PPHM". The following table shows the high and low sales price of our common stock for each quarter in the two years ended April 30, 2013:

(b) Holders. As of June 30, 2013, the number of stockholders of record of our common stock was 5,664.

(c) Dividends. No dividends on common stock have been declared or paid by us. We intend to employ all available funds for the development of our business and, accordingly, do not intend to pay any cash dividends in the foreseeable future.

(d) Securities Authorized for Issuance Under Equity Compensation. The information included under Item 12 of Part III of this Annual Report is hereby incorporated by reference into this Item 5 of Part II of this Annual Report.

(e) Recent Sale of Unregistered Securities . None.

The selected consolidated financial data set forth below as of April 30, 2013 and 2012, and for the fiscal years ended April 30, 2013, 2012 and 2011, are derived from our audited, consolidated financial statements included elsewhere in this Annual Report. This information should be read in conjunction with those consolidated financial statements, the notes thereto, and with "Management's Discussion and Analysis of Financial Condition and Results of Operations." The selected consolidated financial data set forth below as of April 30, 2011, 2010 and 2009, and for the fiscal years ended April 30, 2010 and 2009, are derived from our audited consolidated financial statements that are contained in Annual Reports previously filed with the SEC, not included herein.

______________

The following discussion is included to describe our financial position and results of operations for each of the three years in the period ended April 30, 2013. The consolidated financial statements and notes thereto contain detailed information that should be referred to in conjunction with this discussion.

Overview

We are a biopharmaceutical company with a portfolio of innovative monoclonal antibodies in clinical trials focused on the treatment and diagnosis of cancer. We are advancing two oncology programs with our lead product candidates, bavituximab and Cotara, for the treatment of various cancers. In addition, we are advancing our lead molecular imaging agent, 124I-PGN650, in an exploratory clinical trial for the imaging of multiple solid tumor types.

Our pipeline of novel investigational monoclonal antibodies is based on two first-in-class technology platforms, including phosphatidylserine ("PS")-targeting antibodies and DNA/histone-targeting antibody (Cotara). The following is an update of our oncology and imaging programs in clinical-stage development under these first-in-class technology platforms:

Bavituximab for the Treatment of Solid Tumors

Bavituximab is our lead therapeutic PS-targeting antibody, which has demonstrated broad therapeutic potential and represents a new approach to treating cancer. PS is a highly immunosuppressive molecule usually located inside the membrane of healthy cells, but "flips" and becomes exposed on the outside of cells that line tumor blood vessels, causing the tumor to evade immune detection. Bavituximab targets PS and activates the maturation of dendritic cells and cancer-fighting (M1) macrophages leading to the development of cytotoxic T-cells that fight tumors.

We have conducted three randomized Phase II trials for bavituximab in combination with standard chemotherapy in both front and second-line non-small cell lung cancer ("NSCLC") as well as front-line pancreatic cancer. In addition, we have four ongoing investigator-sponsored trials ("IST") evaluating bavituximab with additional drug combinations in additional oncology indications. From these randomized Phase II clinical trials and ISTs conducted to date, we have identified second-line NSCLC as our lead indication for bavituximab based on:

In addition, in June 2013, we conducted a comprehensive review of our bavituximab oncology program with the goal of adapting a clinical development plan in accordance with the recent increased understanding of the immune-stimulatory properties of bavituximab. We believe that several of the ongoing clinical trials could corroborate bavituximab's immunotherapy mechanism of action in the clinic as they include patient sample collection for immune correlative testing. We are also actively working with our clinical collaborators on how best to design future trials evaluating the potential of combining bavituximab with other immunotherapy agents in addition to the chemotherapy combinations that are currently underway.

The following represents an overview of recently completed, ongoing or currently planned bavituximab clinical trials:

Phase III Registration Trial – Bavituximab Plus Docetaxel in Second-Line NSCLC

In May 2013, we reached agreement with the U.S. Food and Drug Administration ("FDA") on a pivotal Phase III registration trial design of our lead clinical immunotherapeutic candidate bavituximab in second-line NSCLC. This Phase III clinical trial will be a randomized, double-blind, placebo-controlled trial evaluating bavituximab plus docetaxel versus docetaxel alone and will enroll approximately 600 patients at clinical sites worldwide. The trial will enroll non-squamous, NSCLC patients who have progressed after standard front-line treatment. The patients will be randomized into one of two treatment arms. One treatment arm will receive docetaxel (75 mg/m 2 ), up to six 21-day cycles, in combination with bavituximab (3 mg/kg) weekly until progression or toxicity. The second treatment arm will receive docetaxel (75 mg/m 2 ), up to six 21-day cycles, in combination with placebo weekly until progression or toxicity. The primary endpoint of the trial will be overall survival. We anticipate initiating this trial by calendar year-end 2013.

The design of this Phase III trial was supported by promising data from our Phase IIb trial in the same indication as described below.

Phase IIb Trial – Bavituximab Plus Docetaxel in Second-Line NSCLC

We conducted a randomized, double-blind, placebo-controlled Phase IIb second-line NSCLC trial evaluating two dose levels of bavituximab plus docetaxel ("bavituximab-containing arms") versus docetaxel plus placebo ("control arm") as second-line treatment in 121 patients with Stage IIIb/IV NSCLC. Patients were randomized to one of three treatment arms at clinical sites worldwide and enrollment was completed in October 2011. All patients were randomized to receive up to six 21-day cycles of docetaxel (75 mg/m 2 ). In addition, one arm was randomized to receive bavituximab (3 mg/kg) weekly, a second arm was randomized to receive bavituximab (1 mg/kg) weekly, and a third arm was randomized to receive placebo weekly until progression or toxicity. The trial was designed to evaluate overall response rate ("ORR"), the primary endpoint, measured in accordance with Response Evaluation Criteria In Solid Tumors ("RECIST") criteria, and progression-free survival ("PFS"), duration of response, overall survival ("OS"), and safety, were secondary endpoints.

On September 24, 2012, we announced that during the course of preparing for an end-of-Phase II meeting with regulatory authorities and following the data announcement on September 7, 2012 from this Phase IIb trial, we discovered major discrepancies between some patient sample test results and patient treatment code assignments. As a result of these discrepancies, the data that we disclosed on or before September 7, 2012 should not be relied upon.

Upon discovery of the discrepancies, we initiated an internal review of this Phase IIb trial, which included the testing of investigational product, patient samples, reviewing the operations of multiple vendors, among other activities. The initial results of this internal review were announced on January 7, 2013, and indicated that discrepancies were isolated to the control and 1 mg/kg bavituximab-containing treatment arms of the trial and that there was no evidence of discrepancies in the 3 mg/kg bavituximab-containing treatment arm of the trial. Based on the results of our internal review, we took a conservative approach toward analyzing the results from the trial, which included combining the control arm and 1 mg/kg bavituximab-containing arm into one treatment arm ("combined control arm"), and comparing those results to the 3 mg/kg bavituximab-containing treatment arm.

On February 19, 2013, we reported updated top-line survival data from this trial based upon the completion of the aforementioned internal review of discrepancies in the trial and updated patient survival data from the trial. Updated top-line data from this Phase IIb trial indicated a meaningful improvement in median OS of 11.7 months in the 3 mg/kg bavituximab-containing arm compared to 7.3 months in the combined control arm.

On June 3, 2013, we presented the following final data from this Phase IIb trial at the 2013 ASCO Annual Meeting:

In addition, subgroup analyses of overall survival by key patient characteristics favored the bavituximab 3 mg/kg containing arm, including age, gender, Eastern Cooperative Oncology Group ("ECOG") status, ethnicity and prior treatment. The results also indicated that the 3 mg/kg bavituximab plus docetaxel combination was well-tolerated with no significant differences in adverse events between the two trial arms.

Based on these data and discussions with our medical advisors, our strategy is to initiate a pivotal Phase III trial with bavituximab in second-line NSCLC by the end of calendar year 2013 as further discussed above.

Phase II Trial – Bavituximab Plus Paclitaxel/Carboplatin in Front-Line NSCLC

Our Phase II trial is designed to assess bavituximab in combination with paclitaxel and carboplatin in front-line NSCLC. This randomized trial enrolled 86 patients (enrollment completed in September 2011) at clinical sites worldwide. Patients were randomized to one of two treatment arms. All patients were randomized to receive up to six 21-day cycles of paclitaxel and carboplatin (C/P"). In addition, one arm was randomized to receive bavituximab (3 mg/kg) weekly until progression or toxicity. The primary endpoint of this trial is ORR and secondary endpoints include median PFS, median OS, duration of response, and safety. Patients were evaluated regularly for tumor response according to RECIST criteria.

In March 2012, we announced top-line data from this Phase II trial in which the primary ORR endpoint was determined. Initial ORR and median PFS data from this trial were deemed inconclusive and therefore, it was determined that median OS, another secondary endpoint, would be an important data point in determining our next steps in advancing bavituximab in front-line NSCLC in combination with carboplatin and paclitaxel.

Prompted by the enhanced understanding of bavituximab's immunotherapy mechanism of action we presented at the 2013 AACR Annual Meeting, we recently undertook a review of our entire ongoing bavituximab clinical program, including an early analysis of this Phase II front-line NSCLC trial, in order to better direct our clinical development strategy. Results from this analysis, which included less than 60% of survival events, were announced in June 2013 and indicated that while the bavituximab containing treatment arm currently demonstrated a median OS of over 14 months, there was no meaningful difference in survival between the two arms of the trial that would support the advancement of this combination and the current timing of therapy. Separately, an independent study with another immunotherapy agent showed that when C/P are given together with immunotherapy, as was done in this trial, the results were similar to the control arm while starting with C/P before administering the immunotherapy gave much more favorable results. We are currently evaluating options for moving bavituximab forward in front-line NSCLC. We plan to present the full results from this Phase II trial at a future scientific meeting or through publication.

Phase II Trial – Bavituximab Plus Gemcitabine in Pancreatic Cancer

Our Phase II trial was designed to assess bavituximab in combination with gemcitabine in previously untreated Stage IV pancreatic cancer patients. This randomized trial enrolled 70 patients (enrollment completed in June 2012) at clinical sites worldwide. Patients were randomized to one of two treatment arms. All patients were randomized to receive gemcitabine (1000 mg/m2) on days 1, 8 and 15 of each 28-day cycle (4 weeks) until disease progression or unacceptable toxicities. In addition, patients in one arm were randomized to receive bavituximab (3 mg/kg) weekly. The primary endpoint of this trial was median OS and secondary endpoints include median PFS, ORR, duration of response, and safety. Patients were evaluated regularly for tumor response according to RECIST criteria.

In February 2013, we announced results from this trial showing that the combination of bavituximab and gemcitabine resulted in more than a doubling of ORR and an improvement in OS when compared with gemcitabine alone (control arm). In the trial, patients treated with a combination of bavituximab and gemcitabine had a 28% tumor response rate as compared to 13% in the control arm. Median OS was 5.6 months for the bavituximab plus gemcitabine arm and 5.2 months for the control arm. In this trial, bavituximab was generally safe and well tolerated in combination with gemcitabine with similar adverse events occurring in both arms. As this trial allowed for the enrollment of patients 18 and older without any age limit, distant organ involvement and ECOG performance status of 0-2, further analysis of the patient group was warranted.

In June 2013, we announced final results from this trial which included a further analysis of patient subgroups. Median OS, PFS and ORR results were unchanged from the February announcement with data showing encouraging activity in this patient population with very rapid disease progression.

Results from a subgroup analysis showed that the effect of bavituximab plus gemcitabine was more pronounced in patients with ECOG ≤ 1 and those without hepatic metastases. While we believe the final data combined with the results from subgroup analyses warrant future consideration, given the fast progression of pancreatic cancer and the need for longer treatment periods associated with immunotherapies such as bavituximab, there are no plans to initiate a follow-on trial in pancreatic cancer at this time.

Investigator-Sponsored Trials ("IST")

With respect to our ISTs, our clinical collaborators are evaluating bavituximab with additional drug combinations in additional oncology indications, which we believe will provide additional insight into bavituximab's mechanism of action, augment our safety database and evaluate new combination therapy approaches to treating cancer patients. The below table is a summary of our current ISTs:

In addition, we periodically evaluate our IST program based on a number of factors, including enrollment and changes in the standard of care of patients for each of our ongoing ISTs. As a result of our recent evaluation, during March 2013, we discontinued a Phase I/II IST evaluating bavituximab combined with cabazitaxel in patients with second-line castration resistant prostate cancer due to slow enrollment in the trial which we believe will continue due to two new oral drugs that had been approved for the same indication following the inception of this IST. We will continue to monitor our IST program as we look to evaluate new indications and combinations based on the broad therapeutic potential of bavituximab.

PS-Targeting Molecular Imaging Program (PGN650)

In addition to bavituximab's therapeutic potential to treat multiple solid tumors, we believe these PS-targeting antibodies may have broad potential for the imaging and diagnosis of multiple diseases, including cancer. In April 2012, we filed an exploratory Investigational New Drug Application ("IND") with the FDA to advance our lead molecular imaging agent, 124I-PGN650 ("PGN650"), into clinical development for the imaging of multiple solid tumor types. Our initial goal for the PGN650 program is to further validate the broad nature of the PS-targeting platform in the clinic. The current trial will enroll up to 12 patients and results from this study may provide new insight into new indications and potential applications, including development of antibody drug conjugates, the ability of PGN650 to monitor the effectiveness of current standard cancer treatments, and the ability to potentially select patients that may benefit from bavituximab-based treatment.

Cotara for the Treatment of Brain Cancer

Cotara is our lead DNA/histone-targeting antibody and represents a novel approach to treating brain cancer. Cotara is a targeted monoclonal antibody linked to a radioisotope, Iodine 131, that is administered as a single-infusion, one-time therapy directly into the tumor, thereby destroying the tumor from the inside out with minimal exposure to surrounding healthy tissue. Cotara has been granted orphan drug status and fast track designation for the treatment of glioblastoma multiforme ("GBM") and anaplastic astrocytoma by the FDA. In December 2012, we reached an agreement with the FDA on the trial design for a single registration trial for Cotara in patients with recurrent GBM. This trial is based on data from patients treated with Cotara in our Phase II recurrent GBM trial and other earlier Phase I trials. We are currently seeking a partner to further develop Cotara in recurrent GBM.

Integrated Biomanufacturing Subsidiary

In addition to our clinical research and development efforts, we operate a wholly-owned cGMP (current Good Manufacturing Practices) contract manufacturing subsidiary, Avid Bioservices, Inc. ("Avid"). Avid is a Contract Manufacturing Organization that provides fully integrated services from cell line development to commercial cGMP biomanufacturing for Peregrine and its third-party clients. In addition to generating revenue from providing a broad range of biomanufacturing services to third-party clients, Avid is strategically integrated with Peregrine to manufacture all clinical products to support our company-sponsored and investigator-sponsored clinical trials while also preparing for potential commercial launch of bavituximab and Cotara.

Results of Operations

The following table compares the consolidated statements of operations for the fiscal years ended April 30, 2013, 2012 and 2011. This table provides an overview of the changes in the statement of operations for the comparative periods, which changes are further discussed below.

Contract Manufacturing Revenue

Years Ended April 30, 2013 and 2012 Compared to the Years Ended April 30, 2012 and 2011:

The increases in contract manufacturing revenue of $6,550,000 (or 44%) and $6,281,000 (or 74%) during the years ended April 30, 2013 and 2012, respectively, compared to fiscal years 2012 and 2011, respectively, were primarily due to increases in the number of completed manufacturing runs in the years ended April 30, 2013 and 2012, which can be attributed to increases in demand for manufacturing services from Avid's third-party customers.

Based on the current commitments for manufacturing services from Avid's third-party customers and the anticipated completion of in-process third-party customer manufacturing runs, we expect contract manufacturing revenue for fiscal year 2014 to be in-line with fiscal year 2013.

Government Contract Revenue

Year Ended April 30, 2012 Compared to the Year Ended April 30, 2011:

Government contract revenue was derived from a former government contract (the "Government Contract") awarded to us in June 2008, through the Transformational Medical Technologies ("TMT") of the U.S. Department of Defense's Defense Threat Reduction Agency. The purpose of the Government Contract, which expired on April 15, 2011, was to test and develop bavituximab and an equivalent fully human antibody as potential broad-spectrum treatments for viral hemorrhagic fever infections. The fiscal year 2012 decrease in government contract revenue was a direct result of the expiration of the Government Contract on April 15, 2011.

License Revenue

Years Ended April 30, 2013 and 2012 Compared to the Years Ended April 30, 2012 and 2011:

The changes in license revenue in fiscal year 2013 and 2012 compared to fiscal years 2012 and 2011, respectively, were directly related to revenue recognized in accordance with the terms of our existing license agreements.

Based on our existing license agreements, we do not expect license revenue to be a significant source of revenue in fiscal year 2014.

Cost of Contract Manufacturing

Years Ended April 30, 2013 and 2012 Compared to the Years Ended April 30, 2012 and 2011:

The increases in cost of contract manufacturing of $2,442,000 (or 24%) and $2,857,000 (or 39%) during the years ended April 30, 2013 and 2012, respectively, compared to fiscal years 2012 and 2011, respectively, were primarily due to fiscal year 2013 and 2012 increases in contract manufacturing revenue. In addition, we saw an improvement (or percentage decrease) in the cost of contract manufacturing as a percentage of contract manufacturing revenue over the three years ended April 30, 2013 from 86% in fiscal year 2011 to 69% in fiscal year 2012 to 59% in fiscal year 2013. This improvement (or lower cost of contract manufacturing) was primarily attributed to the increasing number of completed manufacturing runs from fiscal year 2011 to fiscal year 2013 and the higher gross margins associated with these services.

Research and Development Expenses

Research and development expenses primarily include (i) payroll and related costs associated with research and development personnel, (ii) costs related to clinical and preclinical testing of our technologies under development, (iii) costs to develop and manufacture the product candidates, including raw materials and supplies, product testing, depreciation, and facility related expenses, (iv) expenses for research services provided by universities and contract laboratories, including sponsored research funding, and (v) other research and development expenses.

Year Ended April 30, 2013 Compared to the Year Ended April 30, 2012:

The decrease in research and development ("R&D") expenses of $11,382,000 (or 32%) during the year ended April 30, 2013 compared to the prior year was due to the following changes associated with each of the following technologies under development:

Based on our current projections, we expect research and development expenses in fiscal year 2014 to increase in comparison to fiscal year 2013 as we plan to execute our goal of initiating a global Phase III registration trial using bavituximab in combination with chemotherapy for the treatment of patients with second-line NSCLC by the end of calendar year 2013 and continue our exploration of bavituximab's broad potential in the treatment and diagnosis of cancer in other indications and combinations. These projections include a number of uncertainties, including but not limited to, (i) the uncertainty of the rate at which patients will be enrolled in any current or future clinical trials, including, our Phase III NSCLC registration trial, (ii) the uncertainty of future clinical and preclinical studies, which are dependent upon the results of current clinical and preclinical studies, (iii) the uncertainty of obtaining regulatory approval to advance our current exploratory IND clinical program to Phase I or to commence any future trials, and (iv) the uncertainty of terms related to any potential future partnering or licensing arrangement. During fiscal year 2014, we expect to continue to direct the majority of our research and development expenses towards our PS-targeting technology platform as we are actively seeking potential partners to further advance the Cotara clinical program.

Year Ended April 30, 2012 Compared to the Year Ended April 30, 2011:

The increase in research and development ("R&D") expenses of $6,226,000 (or 21%) during the year ended April 30, 2012 compared to fiscal year 2011 was due to the following changes associated with each of our following technologies under development:

Looking beyond the next twelve months, we expect to continue to direct the majority of our research and development expenses towards our PS-targeting technology platform although it is extremely difficult for us to reasonably estimate all future research and development costs associated with each of our technologies due to the number of unknowns and uncertainties associated with preclinical and clinical trial development. These unknown variables and uncertainties include, but are not limited to:

We or our potential partners will need to do additional development and clinical testing prior to seeking any regulatory approval for commercialization of our product candidates as all of our products are in discovery, preclinical or clinical development. Testing, manufacturing, commercialization, advertising, promotion, exporting, and marketing, among other things, of our proposed products are subject to extensive regulation by governmental authorities in the United States and other countries. The testing and approval process requires substantial time, effort, and financial resources, and we cannot guarantee that any approval will be granted on a timely basis, if at all. Companies in the pharmaceutical and biotechnology industries have suffered significant setbacks in conducting advanced human clinical trials, even after obtaining promising results in earlier trials. Furthermore, the United States Food and Drug Administration may suspend clinical trials at any time on various grounds, including a finding that the subjects or patients are being exposed to an unacceptable health risk. Even if regulatory approval of a product is granted, such approval may entail limitations on the indicated uses for which it may be marketed. Accordingly, we or our potential partners may experience difficulties and delays in obtaining necessary governmental clearances and approvals to market our products.

Selling, General and Administrative Expenses

Year Ended April 30, 2013 Compared to the Year Ended April 30, 2012:

Selling, general and administrative ("SG&A") expenses consist primarily of payroll and related expenses, director fees, share-based compensation expense, legal fees, audit and accounting fees, patent fees, investor and public relation fees, insurance, and other expenses relating to the general management, administration, and business development activities of the Company.

The increase in SG&A expenses of $1,672,000 (or 15%) during the year ended April 30, 2013 compared to the prior year was primarily due to increases in payroll and related expenses and corporate legal fees of $957,000 and $330,000, respectively. The increase in payroll and related expenses is attributed to increases in compensation and other employee-related benefits and the increase in corporate legal fees is primarily attributable to the lawsuits described in this Annual Report on Form 10-K under Part I, Item 4, "Legal Proceedings". These increases in SG&A expenses were further supplemented with incremental current year increases in audit and accounting fees, market research fees, business development related expenses, and other corporate related expenses.

Year Ended April 30, 2012 Compared to the Year Ended April 30, 2011:

SG&A expenses for the year ended April 30, 2012 remained in-line with fiscal year 2011 increasing slightly by $41,000.

Interest and Other Income

Year Ended April 30, 2013 Compared to the Year Ended April 30, 2012:

The increase in interest and other income of $281,000 during the year ended April 30, 2013, compared to the prior year was due to an increase in interest income of $52,000 combined with an increase in other income of $229,000.

Year Ended April 30, 2012 Compared to the Year Ended April 30, 2011:

The decrease in interest and other income of $1,011,000 during the year ended April 30, 2012, compared to fiscal year 2011 was due to a decrease in interest income of $27,000 combined with a decrease in other income of $984,000. The fiscal year 2012 decrease in other income was directly related to a government grant of $978,000 awarded to us in fiscal year 2011 under Section 48D of the Internal Revenue Code.

Interest and Other Expense

Year Ended April 30, 2012 Compared to the Year Ended April 30, 2011:

The decrease in interest and other expense of $426,000 during the year ended April 30, 2012 compared to fiscal years 2011 was directly related to a lower outstanding principal balance associated with a $5,000,000 term loan we secured in December 2008, which we paid in full in December 2011.

Loss on Early Extinguishment of Debt

Year Ended April 30, 2013 Compared to the Year Ended April 30, 2012:

The increase in loss on early extinguishment of debt of $1,696,000 during the year ended April 30, 2013, compared to the prior year was directly related to the term loan we entered into during August 2012 that was subsequently repaid in full and terminated in September 2012 under an event of default (as described in Note 3 to the accompanying consolidated financial statements). Upon the termination of the term loan, we recorded a loss on the early extinguishment of debt of $1,696,000, which consisted of a final payment fee of $975,000, the unamortized debt discount associated with the fair value of the warrants issued to the lenders under the term loan of $470,000, and unamortized aggregate debt issuance costs of $251,000.

Critical Accounting Policies

Our discussion and analysis of our consolidated financial position and results of operations are based on our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States, or GAAP. The preparation of our consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. We review our estimates and assumptions on an ongoing basis. We base our estimates on historical experience and on assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for our judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may vary from what we anticipate, and different assumptions or estimates about the future could change our reported results. We believe the following accounting policies to be critical to the assumptions and estimates used in the preparation of our consolidated financial statements.

Revenue Recognition

We currently derive revenue from the following two sources: (i) contract manufacturing services provided by Avid, and (ii) licensing revenue related to agreements associated with Peregrine's technologies under development. In addition, from June 30, 2008 through April 15, 2011, we derived government contract revenue from services provided under a government contract awarded to us through the TMT of the U.S. Department of Defense's Defense Threat Reduction Agency. The government contract with the TMT expired on April 15, 2011.

We recognize revenue in accordance with the authoritative guidance for revenue recognition. We recognize revenue when all of the following criteria are met: (i) persuasive evidence of an arrangement exists, (ii) delivery (or passage of title) has occurred or services have been rendered, (iii) the seller's price to the buyer is fixed or determinable, and (iv) collectability is reasonably assured. We also comply with the authoritative guidance for revenue recognition regarding arrangements with multiple deliverables.

In addition, we also follow the authoritative guidance when reporting revenue as gross when we act as a principal versus reporting revenue as net when we act as an agent. For transactions in which we act as a principal, have discretion to choose suppliers, bear credit risk and perform a substantive part of the services, revenue is recorded at the gross amount billed to a customer and costs associated with these reimbursements are reflected as a component of cost of sales for contract manufacturing services and as a component of research and development expense for services provided under our former contract with the TMT (contract expired on April 15, 2011).

Contract Manufacturing Revenue

Revenue associated with contract manufacturing services provided by Avid is recognized once the service has been rendered and/or upon shipment (or passage of title) of the product to the customer. On occasion, we recognize revenue on a "bill-and-hold" basis in accordance with the authoritative guidance. Under "bill-and-hold" arrangements, revenue is recognized once the product is complete and ready for shipment, title and risk of loss has passed to the customer, management receives a written request from the customer for "bill-and-hold" treatment, the product is segregated from other inventory, and no further performance obligations exist.

Any amounts received prior to satisfying our revenue recognition criteria are recorded as deferred revenue in the accompanying consolidated financial statements. We also record a provision for estimated contract losses, if any, in the period in which they are determined.

License Revenue

Revenue associated with licensing agreements primarily consists of non-refundable upfront license fees, non-refundable annual license fees and milestone payments. Non-refundable upfront license fees received under license agreements, whereby continued performance or future obligations are considered inconsequential to the relevant license technology, are recognized as revenue upon delivery of the technology. If a licensing agreement has multiple elements, we analyze each element of our licensing agreements and consider a variety of factors in determining the appropriate method of revenue recognition of each element.

Multiple Element Arrangements. Prior to the adoption of ASU No. 2009-13 on May 1, 2011, if a license agreement has multiple element arrangements, we analyze and determine whether the deliverables, which often include performance obligations, can be separated or whether they must be accounted for as a single unit of accounting in accordance with the authoritative guidance. Under multiple element arrangements, we recognize revenue for delivered elements only when the delivered element has stand-alone value and we have objective and reliable evidence of fair value for each undelivered element. If the fair value of any undelivered element included in a multiple element arrangement cannot be objectively determined, the arrangement would then be accounted for as a single unit of accounting, and revenue is recognized over the estimated period of when the performance obligation(s) are performed.

In addition, under certain circumstances, when there is objective and reliable evidence of the fair value of the undelivered items in an arrangement, but no such evidence for the delivered items, we utilize the residual method to allocate the consideration received under the arrangement. Under the residual method, the amount of consideration allocated to delivered items equals the total arrangement consideration less the aggregate fair value of the undelivered items, and revenue is recognized upon delivery of the undelivered items based on the relative fair value of the undelivered items.

For new licensing agreements or material modifications of existing licensing agreements entered into after May 1, 2011, we follow the provisions of ASU No. 2009-13. If a licensing agreement includes multiple elements, we identify which deliverables represent separate units of accounting, and then determine how the arrangement consideration should be allocated among the separate units of accounting, which may require the use of significant judgment .

If a licensing agreement includes multiple elements, a delivered item is considered a separate unit of accounting if both of the following criteria are met:

Arrangement consideration is allocated at the inception of the agreement to all identified units of accounting based on their relative selling price. The relative selling price for each deliverable is determined using vendor specific objective evidence ("VSOE"), of selling price or third-party evidence of selling price if VSOE does not exist. If neither VSOE nor third-party evidence of selling price exists, we use our best estimate of the selling price for the deliverable. The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable. The consideration received is allocated among the separate units of accounting, and the applicable revenue recognition criteria are applied to each of the separate units. Changes in the allocation of the sales price between delivered and undelivered elements can impact revenue recognition but do not change the total revenue recognized under any agreement.

Milestone Payments. P rior to the adoption of ASU No. 2010-17 on May 1, 2011, milestone payments were recognized as revenue upon the achievement of the specified milestone, provided that (i) the milestone event was substantive in nature and the achievement of the milestone was not reasonably assured at the inception of the agreement, (ii) the fees were non-refundable, and (iii) there was no continuing performance obligations associated with the milestone payment.

Effective May 1, 2011, we adopted on a prospective basis the Milestone Method under ASU No. 2010-17 f or new licensing agreements or material modifications of existing licensing agreements entered into after May 1, 2011. Under the Milestone Method, we recognize consideration that is contingent upon the achievement of a milestone in its entirety as revenue in the period in which the milestone is achieved only if the milestone is substantive in its entirety. A milestone is considered substantive when it meets all of the following criteria:

A milestone is defined as an event (i) that can only be achieved based in whole or in part on either the entity's performance or on the occurrence of a specific outcome resulting from the entity's performance, (ii) for which there is substantive uncertainty at the date the arrangement is entered into that the event will be achieved and (iii) that would result in additional payments being due to the Company.

The provisions of ASU No. 2010-17 do not apply to contingent consideration for which payment is either contingent solely upon the passage of time or the result of a counterparty's performance. We will assess the nature of, and appropriate accounting for, these payments on a case-by-case basis in accordance with the applicable authoritative guidance for revenue recognition.

Any milestone payments received prior to satisfying these revenue recognition criteria were recorded as deferred revenue in the accompanying consolidated financial statements.

Government Contract Revenue

Government contract revenue was derived from a former government contract (the "Government Contract") awarded to us on June 30, 2008, through the TMT of the U.S. Department of Defense's Defense Threat Reduction Agency. The purpose of the Government Contract, which expired on April 15, 2011, was to test and develop bavituximab and an equivalent fully human antibody as potential broad-spectrum treatments for viral hemorrhagic fever infections.

The Government Contract was classified as a "cost-plus-fixed-fee" contract. We recognized government contract revenue in accordance with the authoritative guidance for revenue recognition including the authoritative guidance specific to federal government contracts. Reimbursable costs under the contract primarily include direct labor, subcontract costs, materials, equipment, travel and indirect costs. In addition, we received a fixed fee for our efforts equal to 9.9% of the reimbursable costs incurred under the Government Contract, which was unconditionally earned as allowable costs were billed and was not contingent on success factors. Reimbursable costs under this Government Contract, including the fixed fee, were generally recognized as revenue in the period the reimbursable costs are incurred and become billable. However, when amounts billable, including the fixed fee, were not reasonably related to the proportionate performance of the total work or services to be performed, we recognized revenue on a proportional performance basis. In addition, reimbursable costs, including the fixed fee, associated with manufacturing services were recognized as revenue once delivery (or passage of title) had occurred.

Share-based Compensation Expense

We account for stock options and other share-based awards granted under our equity compensation plans in accordance with the authoritative guidance for share-based compensation. The estimated fair value of share-based payments to employees in exchange for services is measured at the grant date, using a fair value based method, and is recognized as expense on a straight-line basis over the requisite service periods. Share-based compensation expense recognized during the period is based on the value of the portion of the share-based payment that is ultimately expected to vest during the period. Share-based compensation expense for a share-based payment with a performance condition is recognized on a straight-line basis over the requisite service period when the achievement of the performance condition is determined to be probable. If a performance condition is not determined to be probable or is not met, no share-based compensation is recognized and any previously recognized compensation expense is reversed.

The fair value of each option grant is estimated using the Black-Scholes option valuation model and is amortized as compensation expense on a straight-line basis over the requisite service period of the award, which is generally the vesting period. The use of a valuation model requires us to make certain estimates and assumptions with respect to selected model inputs. The expected volatility is based on the daily historical volatility of our common stock covering the estimated expected term. The expected term of options granted reflects actual historical exercise activity and assumptions regarding future exercise activity of unexercised, outstanding options. The risk-free interest rate is based on U.S. Treasury notes with terms within the contractual life of the option at the time of grant. The expected dividend yield assumption is based on our expectation of future dividend payouts. We have never declared or paid any cash dividends on our common stock and currently do not anticipate paying such cash dividends. In addition, guidance requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

If factors change and we employ different assumptions in the determination of fair value in future periods, the share-based compensation expense that we record may differ significantly from what we have recorded in the current period. There are a number of factors that affect the amount of share-based compensation expense, including the number of employee options granted during subsequent fiscal years, the price of our common stock on the date of grant, the volatility of our stock price, the estimate of the expected life of options granted and the risk-free interest rates.

In addition, we periodically grant stock options and other share-based awards to non-employee consultants, which we account for in accordance with the authoritative guidance for share-based compensation. The cost of non-employee services received in exchange for share-based awards are measured based on either the fair value of the consideration received or the fair value of the share-based award issued, whichever is more reliably measurable. In addition, guidance requires share-based compensation related to unvested options and awards issued to non-employees to be recalculated at the end of each reporting period based upon the fair market value on that date until the share-based award has vested, and any adjustment to share-based compensation resulting from the re-measurement is recognized in the current period.

Research and Development Expenses

Research and development costs are charged to expense when incurred in accordance with the authoritative guidance for research and development costs. Research and development expenses primarily include (i) payroll and related costs associated with research and development personnel, (ii) costs related to clinical and preclinical testing of our technologies under development, (iii) costs to develop and manufacture the product candidates, including raw materials and supplies, product testing, depreciation, and facility related expenses, (iv) expenses for research services provided by universities and contract laboratories, including sponsored research funding, and (v) other research and development expenses.

Advance payments, including non-refundable amounts, to secure the receipt of future research and development services are deferred and capitalized. These pre-payments are recognized as an expense in the period that the services are performed. We assess our prepaid research and development expenses for impairment when events or changes in circumstances indicate that the carrying amount of the prepaid expense may not be recoverable or provide future economic benefit.

In addition, we record research and development expenses based on accruals associated with work performed in connection with advancing our clinical trials, which relies on estimates and/or representations from clinical research organizations ("CROs"), hospitals, consultants and other clinical trial related vendors. We maintain regular communication with our vendors, including our CRO vendors, and gauge the reasonableness of estimates provided. However, actual clinical trial costs may differ from estimated clinical trial costs and are adjusted for in the period in which they become known. There were no material adjustments for a change in estimate to research and development expenses in the accompanying consolidated financial statements in any of the three years ended April 30, 2013.

Liquidity and Capital Resources

At April 30, 2013, we had $35,204,000 in cash and cash equivalents. We have expended substantial funds on the research and development of our product candidates, and funding the operations of Avid. As a result, we have historically experienced negative cash flows from operations since our inception and we expect the negative cash flows from operations to continue in the foreseeable future. Our net losses incurred during the past three fiscal years ended April 30, 2013, 2012 and 2011, amounted to $29,780,000, $42,119,000, and $34,151,000, respectively. Therefore, unless and until we are able to generate sufficient revenues from Avid's contract manufacturing services and/or from the sale and/or licensing of our products under development, we expect such losses to continue in the foreseeable future.

Therefore, our ability to continue to fund our clinical trials and development efforts is highly dependent on the amount of cash and cash equivalents on hand combined with our ability to raise additional capital to support our future operations through one or more methods, including but not limited to, issuing additional equity or debt.

Historically, we have funded a significant portion of our operations through the issuance of equity. During fiscal year 2013, we raised $40,754,000 in aggregate gross proceeds under two separate At Market Sales Issuance Agreements (as described in Note 6 to the accompanying consolidated financial statements). Subsequent to April 30, 2013 and through July 11, 2013, we raised an additional $12,729,000 in aggregate gross proceeds under an At Market Issuance Sales Agreement (as described in Note 6 to the accompanying consolidated financial statements). With these additional proceeds, we currently estimate that we have sufficient cash resources to meet our anticipated cash needs to fund our operations through at least fiscal year 2014 based on our current projections, which includes the initiation of our pivotal Phase III clinical trial of bavituximab combined with docetaxel in second-line NSCLC, projected cash inflows under signed contracts with existing customers of Avid and assuming we raise no additional capital from the capital markets or other potential sources.

However, our ability to continue to fund our clinical trials and development efforts in future years, including costs to fund our pivotal Phase III second-line NSCLC trial beyond fiscal year 2014, is highly dependent on our ability to raise additional capital to support our future operations through one or more methods, including but not limited to, financing our operations through the issuance of equity, securing new funding through the issuance of debt, licensing or partnering our products in development, or increasing revenue from our wholly-owned subsidiary, Avid. While we will continue to explore these potential opportunities, we may not be successful in securing debt financing, licensing or partnering our products in development, or generating additional revenue from Avid to complete the research, development, and clinical testing of our product candidates. Even if we are successful in obtaining debt financing, it may involve restrictive covenants on the operation of our business and require significant interest payments.

With respect to our ability to raise additional capital from the issuance of equity, as of July 11, 2013, we have an effective shelf registration statement on Form S-3, under which we may issue, from time to time, in one or more offerings, shares of our common stock for gross proceeds of up to $123,898,000. However, our ability to raise additional capital in the equity markets is dependent on a number of factors, including, but not limited to, the market demand for our common stock. The market demand or liquidity of our common stock is subject to a number of risks and uncertainties, including but not limited to, negative economic conditions, adverse market conditions, adverse clinical trial results, and significant delays in one or more clinical trials. If our ability to access the capital markets becomes severely restricted, it could have a negative impact on our business plans, including our clinical trial programs and other research and development activities. In addition, even if we are able to raise additional capital, it may not be at a price or on terms that are favorable to us.

Significant components of the changes in cash flows from operating, investing and financing activities for the year ended April 30, 2013 compared to the prior year are as follows:

Cash Used In Operating Activities . Net cash used in operating activities represents our (i) net loss, as reported, (ii) less non-cash operating expenses, and (iii) net changes in the timing of cash flows as reflected by the changes in operating assets and liabilities, as described in the below table:

Net cash used in operating activities decreased $14,952,000 to $20,926,000 for the year ended April 30, 2013, compared to net cash used in operating activities of $35,878,000 for the year ended April 30, 2012. This decrease in net cash used in operating activities was due to a decrease of $14,853,000 in net loss reported during fiscal year 2013 after taking into consideration non-cash operating expenses combined with a net change in operating assets and liabilities of $99,000. The decrease in our fiscal year 2013 net loss was primarily due to a current year increase in contract manufacturing revenue combined with a current year decrease in research and development expenses, offset by current year increases in cost of contract manufacturing, selling, general and administrative expenses and loss on early extinguishment of debt.

Cash Used In Investing Activities. Net cash used in investing activities decreased $420,000 to $751,000 for the year ended April 30, 2013 compared to net cash used in investing activities of $1,171,000 during the year ended April 20, 2012. The current year net decrease was due to a decrease in property acquisitions of $701,000 offset by a decrease in other assets of $281,000. The current year decrease in property acquisitions was primarily related to a decrease in leasehold improvements and equipment compared to the prior year. The current year decrease in other assets was primarily related to prior year deposits and/or progress payments for certain additional computer software and equipment to enhance operating efficiencies.

Cash Provided By Financing Activities. Net cash provided by financing activities increased $6,841,000 to $38,848,000 for the year ended April 30, 2013, compared to net cash provided by financing activities of $32,007,000 for the year ended April 30, 2012. Net cash provided by financing activities during fiscal year 2013 consisted of $39,522,000 in net proceeds from the sale of shares of our common stock under two separate At Market Issuance Sales Agreements, including net proceeds of $13,356,000 received during the quarter ended April 30, 2013 from the sale of 9,521,829 shares of our common stock after deducting commissions and other issuance costs of $347,000, combined with $630,000 in aggregate net proceeds received from the purchase of shares under our 2010 Employee Stock Purchase Plan and from stock option exercises, which were offset with principal payments on capital leases of $78,000. In addition, during fiscal year 2013, we received gross proceeds of $15,000,000 under a term loan, excluding debt issuance costs of $251,000, which principal amount was repaid in full during the current year upon the termination of the term loan agreement on September 25, 2012 (as described in Note 3 to the accompanying consolidated financial statements). In addition, we paid a final payment fee of $975,000 upon the termination of the term loan.

Net cash provided by financing activities for the year ended April 30, 2012, consisted of $33,179,000 in aggregate net proceeds from the sale of shares of our common stock under an At Market Issuance Sales Agreement and a registered direct public offering. In addition, we received net proceeds of $236,000 from the purchase of shares under our 2010 Employee Stock Purchase Plan. These prior year net proceeds were offset with principal payments on a term loan of $1,333,000, which we paid in full in December 2011, and capital lease payments of $75,000.

Contractual Obligations

Contractual obligations represent future cash commitments and liabilities under agreements with third parties, and exclude contingent liabilities for which we cannot reasonably predict future payments. The following chart represents our contractual obligations as of April 30, 2013, aggregated by type:

______________

Recently Issued Accounting Pronouncements

See Note 2, Summary of Significant Accounting Policies - Adoption of Recent Accounting Pronouncements and Pending Adoption of Recent Accounting Pronouncements , in the accompanying Notes to Consolidated Financial Statements for a discussion of recent accounting pronouncements and their effect, if any, on our consolidated financial statements.

Changes in U.S. interest rates would affect the interest earned on our cash and cash equivalents, however, they would not have an effect on our capital leases, which have fixed interest rates and terms.

Based on our overall cash and cash equivalents interest rate exposure at April 30, 2013, a near-term change in interest rates, based on historical movements, would not have a material adverse effect on our financial position or results of operations.

The information required by this Item is incorporated by reference to the financial statements set forth in Item 15 of Part IV of this report, "Exhibits and Financial Statement Schedules."

None.

(a) Evaluation of Disclosure Controls and Procedures. The term "disclosure controls and procedures" (defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the "Exchange Act") refers to the controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files under the Exchange Act is recorded, processed, summarized and reported within the required time periods. Under the supervision and with the participation of our management, including our chief executive officer and chief financial officer, we have conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, as of April 30, 2013. Based on this evaluation, our president and chief executive officer and our chief financial officer concluded that our disclosure controls and procedures were effective as of April 30, 2013 to ensure the timely disclosure of required information in our Securities and Exchange Commission filings.

Because of inherent limitations, internal control over financial reporting may not prevent or detect misstatements. In addition, the design of any system of control is based upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all future events, no matter how remote. Accordingly, even effective internal control over financial reporting can only provide reasonable assurance of achieving their control objectives.

(b) Management's Report on Internal Control Over Financial Reporting. Management's Report on Internal Control Over Financial Reporting and the report of our independent registered public accounting firm on our internal control over financial reporting, which appear on the following pages, are incorporated herein by this reference.

(c) Changes in Internal Control over Financial Reporting. There have been no changes in our internal control over financial reporting during the fourth quarter of the fiscal year ended April 30, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Executive Compensation

On July 8, 2013, the Compensation Committee of the Board of Directors (the "Compensation Committee") established target bonus percentages for executive officers and other key members of management which are used in connection with the determination of annual cash bonuses pursuant to the annual cash bonus plan previously approved by the Compensation Committee on July 12, 2011, a summary of which was filed as Exhibit 10.29 (now listed as Exhibit 10.15) to the Company's Annual Report for the fiscal year ended April 30, 2011 (the "Bonus Plan"). The approved target bonus percentages for named executive officers for fiscal year 2013, and each year thereafter unless and until modified by resolution of the Compensation Committee, were as follows: Steven W. King – 60%; Paul J. Lytle – 40%; Mark R. Ziebell – 35%; Joseph S. Shan - 35%; Jeffrey Masten – 35%; and Shelley P.M. Fussey – 35%. In addition, under the Bonus Plan, each participant's target bonus percentages can be further adjusted by a corporate factor ranging from 0 to 1.5 times, based on the Company's achievement of other factors as determined by the Compensation Committee, including but not limited to, performance of day-to-day responsibilities and participation in the achievement of the corporate goals and achievement of individual goals determined by the Compensation Committee.

Additionally, on July 8, 2013, following a detailed review of the status of the Company's fiscal year 2013 corporate goals, and each named executive officer's contribution to the attainment of such corporate goals, as well as his or her attainment of individual goals for fiscal year 2013, and such other factors under the Bonus Plan as the Compensation Committee deemed relevant, the Compensation Committee approved and awarded the following cash bonuses for fiscal year 2013 to the named executive officers pursuant to the Bonus Plan: Steven W. King – $313,706; Paul J. Lytle – $158,833; Mark R. Ziebell – $111,501; Joseph S. Shan - $88,725; Jeffrey Masten – $97,256; and Shelley P.M. Fussey – $95,721.

PEREGRINE PHARMACEUTICALS, INC.

MANAGEMENT'S REPORT ON

INTERNAL CONTROL OVER FINANCIAL REPORTING

The management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting and for the assessment of the effectiveness of internal control over financial reporting. The Company's internal control over financial reporting is a process designed, as defined in Rule 13a-15(f) and Rule 15d-15(f) under the Securities Exchange Act of 1934, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting principles.

The Company's internal control over financial reporting is supported by written policies and procedures that:

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In connection with the preparation of the Company's annual consolidated financial statements, management of the Company has undertaken an assessment of the effectiveness of the Company's internal control over financial reporting based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission ("the COSO Framework"). Management's assessment included an evaluation of the design of the Company's internal control over financial reporting and testing of the operational effectiveness of the Company's internal control over financial reporting.

Based on this assessment, management has concluded that the Company's internal control over financial reporting was effective as of April 30, 2013.

Ernst & Young LLP, the independent registered public accounting firm that audited the company's consolidated financial statements included in this Annual Report on Form 10-K, has issued an attestation report on the Company's internal control over financial reporting which appears on the following page.

July 11, 2013

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of Peregrine Pharmaceuticals, Inc.

We have audited Peregrine Pharmaceuticals, Inc.'s internal control over financial reporting as of April 30, 2013, based on criteria established in Internal Control--Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). Peregrine Pharmaceuticals, Inc.'s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Peregrine Pharmaceuticals, Inc.'s Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Peregrine Pharmaceuticals, Inc., maintained, in all material respects, effective internal control over financial reporting as of April 30, 2013, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Peregrine Pharmaceuticals, Inc. as of April 30, 2013 and 2012, and the related consolidated statements of operations and comprehensive loss, stockholders' equity and cash flows for each of the three years in the period ended April 30, 2013, and our report dated July 11, 2013, expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Irvine, California

July 11, 2013

PART III

The information required by this Item regarding our directors, executive officers and committees of our board of directors is incorporated by reference to the information set forth under the captions "Election of Directors" "Executive Compensation" and "Corporate Governance" in our 2013 Definitive Proxy Statement to be filed within 120 days after the end of our fiscal year ended April 30, 2013 (the "2013 Definitive Proxy Statement").

Information required by this Item regarding Section 16(a) reporting compliance is incorporated by reference to the information set forth under the caption "Section 16(a) Beneficial Ownership Reporting Compliance" in our 2013 Definitive Proxy Statement.

Information required by this Item regarding our code of ethics is incorporated by reference to the information set forth under the caption "Corporate Governance" in Part I of this Annual Report on Form 10-K.

The information required by this Item is incorporated by reference to the information set forth under the captions "Director Compensation", "Compensation Discussion and Analysis" and "Executive Compensation" in our 2013 Definitive Proxy Statement to be filed within 120 days after the end of our fiscal year ended April 30, 2013.

The information required by this Item is incorporated by reference to the information set forth under the captions "Security Ownership of Certain Beneficial Owners, Directors and Management" and "Equity Compensation Plan Information" in our 2013 Definitive Proxy Statement to be filed within 120 days after the end of our fiscal year ended April 30, 2013.

The information required by this Item is incorporated by reference to the information set forth under the captions "Certain Relationships and Related Transactions" "Director Independence" and "Compensation Committee Interlocks and Insider Participation" in our 2013 Definitive Proxy Statement to be filed within 120 days after the end of our fiscal year ended April 30, 2013.

The information required by this Item is incorporated by reference to the information set forth under the caption "Independent Registered Public Accounting Firm Fees" in our 2013 Definitive Proxy Statement to be filed within 120 days after the end of our fiscal year ended April 30, 2013.

PART IV

All other schedules for which provision is made in the applicable accounting regulations of the Securities and Exchange Commission are not required under the related instructions or are inapplicable and therefore have been omitted.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Steven W. King, President and Chief Executive Officer, and Paul J. Lytle, Chief Financial Officer, and each of them, his true and lawful attorneys-in-fact and agents, with the full power of substitution and re-substitution, for him and in his name, place and stead, in any and all capacities, to sign any amendments to this report, and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or either of them, or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated:

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of Peregrine Pharmaceuticals, Inc.

We have audited the accompanying consolidated balance sheets of Peregrine Pharmaceuticals, Inc. as of April 30, 2013 and 2012, and the related consolidated statements of operations and comprehensive loss, stockholders' equity, and cash flows for each of the three years in the period ended April 30, 2013. Our audits also included the financial statement schedule listed in the Index at Item 15 (a)(2). These consolidated financial statements and schedule are the responsibility of the Company's management. Our responsibility is to express an opinion on these consolidated financial statements and schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Peregrine Pharmaceuticals, Inc. at April 30, 2013 and 2012, and the consolidated results of its operations and its cash flows for each of the three years in the period ended April 30, 2013, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Peregrine Pharmaceuticals, Inc.'s internal control over financial reporting as of April 30, 2013, based on criteria established in Internal Control--Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated July 11, 2013, expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Irvine, California

July 11, 2013

PEREGRINE PHARMACEUTICALS, INC.

CONSOLIDATED BALANCE SHEETS

AS OF APRIL 30, 2013 AND 2012

See accompanying notes to consolidated financial statements.

PEREGRINE PHARMACEUTICALS, INC.

CONSOLIDATED BALANCE SHEETS

AS OF APRIL 30, 2013 AND 2012 ( continued )

See accompanying notes to consolidated financial statements.

PEREGRINE PHARMACEUTICALS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

FOR EACH OF THE THREE YEARS IN THE PERIOD ENDED APRIL 30, 2013

See accompanying notes to consolidated financial statements.

PEREGRINE PHARMACEUTICALS, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

FOR EACH OF THE THREE YEARS IN THE PERIOD ENDED APRIL 30, 2013

See accompanying notes to consolidated financial statements.

PEREGRINE PHARMACEUTICALS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

FOR EACH OF THE THREE YEARS IN THE PERIOD ENDED APRIL 30, 2013