Onyx Pharmaceuticals Announces Presentation At Cowen Health Care Conference

EMERYVILLE, CALIF. - Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) today announced that it will present at the Cowen Health Care conference on Wednesday, March 14, at 10:15 a.m. Eastern Time. Interested parties may access a live webcast of the presentation at:
http://www.corporate-ir.net/ireye/conflobby.zhtml?ticker=ONXX&item_id=1491230

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 within 24 hours of the completion of the presentation through April 14, 2007.

Onyx Pharmaceuticals, Inc. is a biopharmaceutical company developing innovative therapies that target the molecular mechanisms that cause cancer. The company is developing Nexavar®, a small molecule drug, with Bayer Pharmaceuticals Corporation. Nexavar has been approved for the treatment of advanced kidney cancer. For more information about Onyx’s pipeline and activities, visit the company’s web site at: www.onyx-pharm.com.

Nexavar® (sorafenib) tablets is a registered trademark of Bayer Pharmaceuticals Corporation.