Item 8.01. Other Events.

On May 31, 2009, Cougar Biotechnology, Inc. (the "Company") issued a press release announcing results from ongoing clinical trials of the Company's investigational drug CB7630 (abiraterone acetate), which data were presented at the 2009 Annual Meeting of the American Society of Clinical Oncology. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.