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Affitech-Discovered Anti-PS Antibodies in Development by Peregrine Pharmaceuticals Show Excellent Functionality in Preclinical Studies
Date:4/28/2009

OSLO, Norway, April 28 /PRNewswire/ -- Affitech AS, the human antibody therapeutics company, announced today that preclinical data on two fully human anti-PS (phosphatidylserine) antibodies were presented by its collaboration partner Peregrine Pharmaceuticals at the 100th Annual Meeting of the American Association for Cancer Research (AACR) 2009 held during April 18 - 22, 2009 in Denver, CO. The preclinical studies of PGN635 and PGN632 provided further confirmatory evidence that the anti-tumor effects observed with anti-PS antibodies reflect their immunomodulatory mechanism of action, including their ability to stimulate the immune system. Additionally, PGN635 demonstrated encouraging signs of efficacy in a preclinical model of prostate cancer. Both antibodies were isolated using Affitech's unique MBAS (Molecule Based Antibody Screening) method for selection and improvement of fully human antibodies from large libraries.

The researchers from Peregrine, Affitech and UT Southwestern Medical Center confirmed previous observations that in vitro, anti-PS antibodies stimulate the tumor microenvironment to recruit monocytes and other immune cells to the tumor with resulting anti-tumor effects, most likely via cell-mediated mechanisms such as antibody-dependent cell-mediated cytotoxicity (ADCC). Their data further defined the role of anti-PS antibodies in mediating tumor cell cytotoxicity and the tumor microenvironment, showing that the anti-PS antibody induced a sequential release of cytokines and beta-chemokines and stimulated enhanced macrophage recruitment to tumors. Furthermore, the researchers showed that in vitro, PGN635 induced antibody-dependent death of endothelial cells, the same cell type found in the tumor vasculature, a key target of anti-PS cancer therapy. The studies also demonstrated the anti-tumor potential of PGN635 in vitro and in a number of animal cancer models. Specifically, in a mouse model of prosta
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