2009 Press Releases

Onyx Pharmaceuticals to Present at the 29th Annual Canaccord Adams Global Growth Conference

Emeryville, CA. — Aug. 06, 2009

Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) today announced that it will present at the 29th Annual Canaccord Adams Global Growth Conference on Thursday, August 13, at 10:30 a.m. Eastern Time. Interested parties may access a live webcast of the presentation on our website at:

http://www.onyx-pharm.com/view.cfm/32/Event-Calendar

It is recommended that listeners log on 15 minutes early in order to register and download any necessary software. For those unable to participate during the live webcast, a recorded replay of the presentation will be available one hour following the conclusion of the presentation through September 13, 2009.

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 Pharmaceuticals Corporation.