2009 Press Releases

Onyx Pharmaceuticals Announces Investor Teleconference and Webcast

Emeryville, CA. — Oct. 11, 2009

Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) today announced that it will webcast a teleconference with management to provide a general business update on Monday, October 12, 2009, at 8:00 a.m. Eastern Time (5:00 a.m. Pacific Time).

Interested parties may access a live webcast of the presentation on the company’s website at:
http://www.onyx-pharm.com/view.cfm/32/Event-Calendar

or by dialing 847-413-3362 and using the passcode 25577870#. A replay of the presentation will be available on the Onyx website or by dialing 630-652-3044 and using the passcode 25577870# approximately one hour after the teleconference concludes. The replay will be available through November 12, 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®, 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® (sorafenib) tablets is a registered trademark of Bayer HealthCare Pharmaceuticals.