Medarex Reports Interim Data from Ongoing Ipilimumab Combination Phase 1 Studies in Prostate Cancer at American Association for Cancer Resear...( PRINCETON N.J. April 15 /- Medare...),Health

PRINCETON, N.J., April 15 /PRNewswire-FirstCall/ -- Medarex, Inc. (Nasdaq: MEDX) announced today interim results from two ongoing Phase 1 trials in hormone refractory prostate cancer (HRPC) demonstrating dose-dependent T-cell activation and clinical activity of ipilimumab, an investigational anti-CTLA-4 antibody. These studies were done in combination with antigen-releasing immunotherapies based on GM-CSF, a cytokine that stimulates the proliferation of white blood cells and augments immune responses, and results were presented in two separate oral presentations by investigators at the Annual Meeting of the American Association for Cancer Research (AACR), being held April 12-16, 2008 in San Diego.

"The interim results demonstrating clinical activity in these ongoing trials lend additional support to the concept of ipilimumab as part of a therapeutic regimen in treating prostate cancer," said Geoffrey M. Nichol, M.B.Ch.B., Senior Vice President of Product Development at Medarex. "We will continue to explore the prospects of ipilimumab in HRPC, and we expect further data in prostate cancer for ipilimumab monotherapy and in combination with other antigen-releasing agents at this year's ASCO conference in June."

-- "Dendritic and T cell functions in patients with metastatic

hormone-refractory prostate cancer treated with GVAX immunotherapy for

prostate cancer and ipilimumab" (Abstract #2538)

Interim data from the ongoing Phase 1 study of escalating doses of

ipilimumab in combination with the Cell Genesys, Inc. GVAX

immunotherapy for prostate cancer (an investigational agent comprised

of whole tumor cells modified to secrete GM-CSF) were presented by

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