Peregrine Pharma (PPHM) Presents Statistically Significant Data from Bavituximab Phase 3 SUNRISE Trial at ESMO 2016

October 10, 2016 8:07 AM EDT

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Peregrine Pharmaceuticals, Inc. (Nasdaq: PPHM) (Nasdaq: PPHMP) reported that top-line data from the Phase III SUNRISE trial of bavituximab in patients with previously treated locally advanced or metastatic non-squamous non-small cell lung cancer (NSCLC) were presented in an oral presentation at the European Society for Medical Oncology (ESMO) 2016 Congress. The presentation included interim efficacy and safety outcomes, as well as initial findings from the company’s ongoing biomarker analysis of samples collected during the study. The SUNRISE Phase III trial was discontinued earlier this year based on a pre-specified interim analysis although patient treatment and follow-up in the study were allowed to continue. The pre-planned biomarker analysis has been taking place as patient follow-up has continued and available results were evaluated as part of the recent top-line data analysis.

The study protocol pre-specified the collection of thousands of patient samples for exploratory analyses over a wide range of possible biomarkers, including pre-treatment levels of beta-2 glycoprotein-1 (β2GP1). Data presented at ESMO demonstrated that patients with pre-treatment β2GP1 levels between 200 and 240 (representing approximately 30% of randomized patients) achieved a statistically significant, 5.5-month improvement (13.2 months vs. 7.7 months) in median overall survival (OS) as compared to patients in the control group with the same range of β2GP1 levels [p = 0.049; hazard ratio (HR) = 0.67]. A similar trend was observed with pre-treatment β2GP1 levels ≥ 200 µg/mL (representing approximately 50% of randomized patients) with 11.9 months vs. 10.1 months median OS in favor of the bavituximab-containing group (p = 0.155; HR = 0.81). Taken together, this strongly suggests β2GP1 levels may be useful for identifying patients who are more likely to benefit from a bavituximab containing therapeutic regimen. Numerous additional biomarkers are currently being analyzed with the goal of developing a multi-marker signature that can potentially identify patients that are likely to receive significant clinical benefit from a bavituximab-containing therapeutic regimen.

Top-line results reported at ESMO today were based on a data cut-off after 70% (330/473) of the targeted OS events had been reached and demonstrated the addition of bavituximab to docetaxel did not result in improvement of the study’s primary endpoint of OS in the intent-to-treat population. Median OS for the bavituximab plus docetaxel group was 10.7 months as compared to 10.8 months for the placebo plus docetaxel control group (HR = 1.110; p = 0.382). Median progression free survival (PFS) for the bavituximab-containing group was 4.1 months compared to 3.9 months for the control group (HR = 0.97; p = 0.803). Objective response rates based on independent central review are currently 13% and 11% (p = 0.53) for the bavituximab-containing and control groups, respectively. Additionally, the safety profile of the combination of bavituximab with docetaxel was similar to placebo plus docetaxel.

“With every clinical trial we conduct, we are constantly reminded of the difficulty involved in treating patients with non-small cell lung cancer. This continues to prove to be a very challenging cancer to combat and the need for effective treatments remains high,” David R. Spigel, MD, chief scientific officer and program director of Lung Cancer Research at the Sarah Cannon Research Institute and one of the lead investigators in the SUNRISE trial. “The findings with regard to β2GP1 that have been collected as part of the ongoing SUNRISE trial data analysis are interesting and support further investigation.”

Peregrine intends to further evaluate the role of β2GP1 levels in response to bavituximab therapy in future clinical trials. The company has filed a new patent application directed to the use of this initial biomarker discovery. Additional patient sample testing and analysis is ongoing and may result in other biomarkers of importance.

“We would once again like to thank all of the patients, clinical investigators and scientists who participated in the SUNRISE trial and have made it possible for us to continue to collect and analyze a range of key data from the study. While we were disappointed with the trial being discontinued earlier in the year, we are excited by the fact that we are beginning to learn important information from the trial through the ongoing biomarker analysis program that will be critical in helping guide the future clinical development of bavituximab,” said Joseph Shan, vice president of clinical and regulatory affairs at Peregrine. “It is encouraging that the initial biomarker analysis has identified an important biomarker early in the process and we are optimistic that additional biomarkers associated with improved outcomes for bavituximab-containing treatments will be identified as the analysis continues. We expect to be able to share the emerging data over the coming months at scientific and medical conferences as the more results become available.”

Mr. Shan continued, “It is not uncommon in the cancer field for therapeutic candidates to suffer clinical trial setbacks as researchers continue to learn more about the most appropriate patient populations for those drugs. In this landscape, biomarkers play an increasingly important role in helping identify specific patient characteristics that may impact responses to a treatment. This has been seen historically with targeted cancer treatments, as well as more recently with checkpoint inhibitors including PD-1 inhibitors. We look forward to identifying the equivalent markers for bavituximab that will help guide its clinical development.”

Bavituximab is an investigational chimeric monoclonal antibody that targets phosphatidylserine (PS). Signals from PS inhibit the ability of immune cells to recognize and fight tumors. Bavituximab is believed to override PS mediated immunosuppressive signaling by blocking the engagement of PS with its receptors as well as by sending an alternate immune activating signal. PS targeting antibodies have been shown to shift the functions of immune cells in tumors, resulting in multiple signs of immune activation and anti-tumor immune responses.

Peregrine’s clinical development strategy for bavituximab is currently focused on small, early-stage proof-of-concept trials evaluating the drug in combination with other cancer treatments. The intent behind this strategy is to control research and development costs, while continuing to generate clinical data to further validate bavituximab's combination potential that will be critical to bringing onboard a partner to help advance the program.

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