( LOS ANGELES--(BUSINESS WIRE)--Apr 17 2...)Cougar Biotechnology Presents Positive CB7630 Clinical Data at AACR,Annual Meeting Late-Breaking Clinical Trials Session,Health

LOS ANGELES--(BUSINESS WIRE)--Apr 17, 2007 - Cougar Biotechnology, Inc. (OTCBB:CGRB) today announced that positive Phase I and Phase II data on the Company's prostate cancer drug candidate CB7630 (abiraterone acetate) was presented at the American Association for Cancer Research (AACR) Annual Meeting in Los Angeles, California. The data was presented in two oral presentations as part of a special session, Phase II Proof of Concept Late-Breaking Clinical Trials. These presentations are further detailed below:

Inhibition of androgen synthesis results in a high response rate in castration refractory prostate cancer: A Phase II clinical trial

The Phase I/II trial of CB7630 was conducted at The Institute of Cancer Research and at The Royal Marsden NHS Foundation Trust in the United Kingdom. In the trial, CB7630 was administered orally, once daily, to chemotherapy-naive patients with castration refractory prostate cancer (CRPC), who had progressive disease despite treatment with LHRH analogues and multiple other hormonal therapies, including antiandrogens, diethylstilboestrol and dexamethasone. To date a total of 38 patients have been treated in the Phase I/II trial, including 15 patients treated in the Phase I portion of the trial and 23 patients treated in the Phase II portion of the trial. In his oral presentation, Dr. Gerhardt Attard from The Institute of Cancer Research and The Royal Marsden NHS Foundation Trust in the United Kingdom reported that in the 38 patients treated in this trial, CB7630 was well tolerated at doses as high as 2000 mg/day with minimal toxicity. Moreover, no dose limiting toxicity has been observed in the trial to date.

Of the 30 patients who were evaluable in the Phase I/II trial, 18 patients (60%) experienced confirmed declines in prostate specific antigen (PSA) levels of greater than 50%, with 10 of the 30 patients (33%) experiencing PSA declines of greater than 90%. Of th
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