( 630. Individual patients treatedwith C...)Cougar Biotechnology Presents Positive CB7630 Clinical Data at AACR,Annual Meeting Late-Breaking Clinical Trials Session,Health

Dr. Arie S. Belldegrun, M.D., FACS, Vice Chairman of the Board of Directors of Cougar Biotechnology, said, "The data from both trials of CB7630 presented at AACR continues to support the potential role of the drug in the treatment of CRPC. Interestingly, CB7630 showed strong evidence of antitumor activity in patients who were both chemotherapy naive and chemotherapy refractory, both of which represent significant unmet medical needs in prostate cancer. We continue to have strong confidence in CB7630's potential in both of these patient populations." Alan H. Auerbach, Chief Executive Officer and President of Cougar Biotechnology, added, "We are pleased to be able to present data from both of these CB7630 trials at AACR. We look forward to continuing to provide updates on these ongoing trials at future cancer conferences and greatly look forward to the continued development of CB7630 in both the second line hormone therapy and second line chemotherapy settings."

About Cougar Biotechnology

Cougar Biotechnology, Inc. is a Los Angeles-based biotechnology company established to in-license and develop clinical stage drugs, with a specific focus on the field of oncology. Cougar's oncology portfolio includes CB7630, a targeted inhibitor of the 17-alpha hydroxylase/c17,20 lyase enzyme, which is currently being tested in Phase II clinical trials in prostate cancer; CB3304, an inhibitor of microtubule dynamics, which is currently in a Phase I trial in hematological malignancies; and CB1089, an analog of vitamin D, which has been clinically tested in a number of solid tumor types.

Further information about Cougar Biotechnology can be found at www.cougarbiotechnology.com.

This press release contains f
'"/>