Onyx Pharmaceuticals Announces Second Quarter 2009 Financial Results Teleconference and Webcast

EMERYVILLE, Calif., July 29 /PRNewswire-FirstCall/ — Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) today announced that it will webcast a teleconference with management to provide a general business overview, as well as to discuss second quarter 2009 financial results, on Tuesday, August 4, 2009, at 5:00 p.m. Eastern Time (2:00 p.m. Pacific Time). Financial results for the second quarter ended June 30, 2009 will be released earlier that day.

Interested parties may access a live webcast of the presentation on the company’s website at: http://www.onyx-pharm.com/wt/page/event_calendar or by dialing 847-413-3362 and using the passcode 24875257. A replay of the presentation will be available on the Onyx website or by dialing 630-652-3044 and using the passcode 24875257 approximately one hour after the teleconference concludes. The replay will be available through September 4, 2009.

About Onyx Pharmaceuticals, Inc.

Onyx Pharmaceuticals, Inc. is a biopharmaceutical company committed to improving the lives of people with cancer. The company, in collaboration with Bayer HealthCare Pharmaceuticals, Inc., is developing and marketing Nexavar(R), a small molecule drug. Nexavar is currently approved for the treatment of liver cancer and advanced kidney cancer. Additionally, Nexavar is being investigated in several ongoing trials in a variety of tumor types. For more information about Onyx, visit the company’s website at www.onyx-pharm.com.

Nexavar(R) (sorafenib) tablets is a registered trademark of Bayer HealthCare Pharmaceuticals.

SOURCE Onyx Pharmaceuticals, Inc.