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April 5, 2011
Peregrine's PS-Targeting Antibody Significantly Improves Anti-Tumor Effect of Sorafenib in Models of Advanced Liver Cancer
AACR Data Presentation Supports Phase I/II Investigator-Sponsored Clinical Trial in Advanced Liver Cancer
TUSTIN, CA and ORLANDO, FL -- (MARKET WIRE) -- 04/05/11 -- Peregrine Pharmaceuticals, Inc. (NASDAQ: PPHM), a clinical-stage biopharmaceutical company developing first-in-class monoclonal antibodies for the treatment of cancer and viral infections, today announced that its phosphatidylserine (PS)-targeting antibody significantly enhanced the anti-tumor effects of sorafenib (Nexavar®) in models of hepatocellular carcinoma (HCC), with 69% less tumor growth compared to sorafenib alone. This study, one of four poster presentations on Peregrine's PS-targeting antibodies at the Annual Meeting of the American Association of Cancer Research (AACR), was the basis for initiating a Phase I/II investigator-sponsored trial (IST) evaluating the company's lead antibody bavituximab with sorafenib in patients with advanced HCC. Bavituximab is currently in three randomized Phase II clinical trials in lung cancer and pancreatic cancer and several ISTs for additional oncology indications.
"Our studies show that sorafenib more than doubles the amount of the immunosuppressive molecule PS exposed on the blood vessels of HCC tumors," said Philip E. Thorpe, Ph.D., professor of pharmacology at UT Southwestern Medical Center, scientific adviser to Peregrine and inventor of the company's PS-targeting antibody technology. "These data suggest that the growth-blocking mechanisms of sorafenib combined with the vascular-targeting and immune-reactivation mechanisms of bavituximab may offer additive anti-tumor effects for patients with HCC."
As presented today at AACR, tumor growth was 69% less for the group receiving Peregrine's antibody in combination with sorafenib than for the group receiving sorafenib alone (mean tumor weight of 127 mg versus 409 mg, n=10, p Less
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