Onyx Pharmaceuticals Announces First Quarter 2006 Financial Results Teleconference And Webcast

Emeryville, Calif., — Apr. 27, 2006

Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) today announced that it will webcast a teleconference with management to discuss first quarter 2006 financial results and provide a general business overview on Thursday, May 4, 2006, at 5:00 p.m. Eastern Time (2:00 p.m. Pacific Time).  Financial results for the first quarter ended March 31, 2021 will be released earlier that day.

Interested parties may access a live webcast of the presentation at:  http://audioevent.mshow.com/295362

or by dialing 706-758-9355 and using the passcode 7413173.  A replay of the presentation will be available on the Onyx website or by dialing 706-645-9291 and using the passcode 7413173 approximately one hour after the teleconference concludes.  The replay will be available through June 4, 2006.

Onyx Pharmaceuticals is engaged in the development of novel cancer therapies that target the molecular basis of cancer.  With its collaborators, the company is developing small molecule drugs, including Nexavar® (sorafenib) tablets with Bayer Pharmaceuticals Corporation.  For more information about Onyx’s pipeline and activities, visit the company’s website at
www.onyx-pharm.com.

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

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