Bayer and Onyx Announce Nexavar Data Presentations at the Joint 15th European CanCer Organisation (ECCO) and 34th European Society for Medical Oncology (ESMO) Multidisciplinary Congress

Onyx Pharmaceuticals Changing the Way Cancer is Treated Press Releases Bayer and Onyx Announce Nexavar Data Presentations at the Joint 15th European CanCer Organisation (ECCO) and 34th European Society for Medical Oncology (ESMO) Multidisciplinary Congress

Wayne, NJ and Emeryville, CA . — Sep. 15, 2009 --Bayer HealthCare Pharmaceuticals, Inc. and Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) today announced that approximately 30 studies evaluating the use of Nexavar® (sorafenib) tablets across tumor types – as a single agent or in combination with other therapies – will be presented at the joint 15th European CanCer Organisation (ECCO) and 34th European Society for Medical Oncology (ESMO) Multidisciplinary Congress, September 20 – 24 in Berlin.

“The presentations at the ECCO/ESMO conference will continue to build on our large body of data in unresectable liver cancer and advanced kidney cancer where Nexavar has a proven track record,” said Dimitris Voliotis, Vice President, Global Clinical Development Oncology. “Additionally, Bayer and Onyx are enthusiastic about presenting Phase 2 studies evaluating the safety and efficacy of Nexavar in other tumor types, including breast and thyroid cancers.”

Nexavar data highlights include:

Hepatocellular Carcinoma

• Effect of Macroscopic Vascular Invasion (MVI), Extrahepatic Spread (EHS), and ECOG Performance Status (ECOG PS) on Outcome in Patients with Advanced Hepatocellular Carcinoma (HCC) Treated with Sorafenib: Analysis of Two Phase 3, Randomized Double-Blind Trials o Jean-Luc Raoul, M.D., Centre Eugène Marquis, Rennes, France o Abstract 6621, Poster 309, Wednesday, September 23, 2009, 2 p.m. – 5 p.m., Hall 14.1

• Efficacy and Safety of Sorafenib in Patients with Advanced Hepatocellular Carcinoma (HCC): Collective Results from the Phase III Sorafenib HCC Assessment Randomized Protocol (SHARP) and Asia-Pacific (AP) Trials o Josep Llovet, M.D., Barcelona Clinic Liver Cancer (BCLC) Group, Liver Unit, CIBERehd, IDIBAPS, Hospital Clinic Barcelona, Barcelona, Spain o Abstract 6519, Poster 13, Tuesday, September 22, 2009, 8 a.m. – 11 a.m., Poster Discussion, 11:15 a.m. – 12:15 p.m., Central Lobby (Outside Hall 3)

Renal Cell Carcinoma

• Final Analysis of a Large Open-label, Noncomparative, Phase 3 Study of Sorafenib in European Patients with Advanced RCC (EU-ARCCS) o Joachim Beck, M.D., Johannes-Gutenberg-Universität III. Medizinische Klinik, Mainz, Germany o Abstract 7137, Poster 150, Monday, September 21, 2009, 2 p.m. – 5 p.m., Hall 14.1

• Efficacy and Safety of Long-term Use of Sorafenib: Final Report of a Phase II Trial of Sorafenib in Japanese Patients with Unresectable/Metastatic Renal Cell Carcinoma o Hideyuki Akaza, M.D., Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan o Abstract 7147, Poster 160, Monday, September 21, 2009, 2 p.m. – 5 p.m., Hall 14.1

• Efficacy and Safety of Sorafenib in Patients with Advanced Clear-Cell Renal-Cell Carcinoma (RCC) with Bone Metastases: Results from the Phase III TARGET Study o Ronald M. Bukowski, M.D., Cleveland Clinic Taussig Cancer Center, Cleveland, OH o Abstract 7130, Poster 143, Monday, September 21, 2009, 2 p.m. – 5 p.m., Hall 14.1

• PREDICT (Patient characteristics in REnal cell carcinoma and Daily practICe Treatment with Nexavar) Global Non-interventional Study: First interim results o Dirk Jäger, M.D., National Center for Tumor Diseases, University of Heidelberg, Heidelberg, Germany o Abstract 7128, Poster 141, Monday, September 21, 2009, 2 p.m. – 5 p.m., Hall 14.1

Breast Cancer

• A double-blind, randomized phase 2b study evaluating the efficacy and safety of sorafenib (SOR) compared to placebo (PL) when administered in combination with capecitabine (CAP) in patients (pts) with locally advanced (adv) or metastatic (met) breast cancer (BC) o Jose Baselga, M.D., Vall d'Hebron University Hospital in Barcelona, Spain o Late-breaking abstract 3LBA, Presidential Session III, Wednesday, September 23, 1:30 p.m., Hall 1

Thyroid Cancer

• Completion of a Phase II study of sorafenib for advanced thyroid cancer o Marcia Brose, M.D., Ph.D. Department of Medicine, Division of Hematology/Oncology and Department of Otorhinolaryngology: Head and Neck Surgery, Abrahamson Cancer Center of the University of Pennsylvania, Philadelphia, PA, U.S.A. o Late-breaking poster 51LBA, Poster 276, Tuesday, September 22, 11 a.m. – 1:00 p.m. Hall 14.1

Nexavar's Differentiated Mechanism Nexavar targets both the tumor cell and tumor vasculature. In preclinical studies, Nexavar has been shown to target members of two classes of kinases known to be involved in both cell proliferation (growth) and angiogenesis (blood supply) – two important processes that enable cancer growth. These kinases included Raf kinase, VEGFR-1, VEGFR-2, VEGFR-3, PDGFR-B, KIT, FLT-3 and RET.

Nexavar is currently approved in more than 80 countries for the treatment of patients with liver cancer and in more than 90 countries for the treatment of patients with advanced kidney cancer. Nexavar is also being evaluated by the companies, international study groups, government agencies and individual investigators as a single agent or combination treatment in a wide range of cancers, including breast cancer, colorectal cancer, lung cancer, ovarian cancer, and as an adjuvant therapy for kidney cancer and liver cancer.

Important Safety Considerations For Patients Taking Nexavar Based on the currently approved U.S. package insert for the treatment of patients with unresectable hepatocellular carcinoma and advanced kidney cancer, hypertension may occur early in the course of therapy and blood pressure should be monitored weekly during the first six weeks of therapy and treated as needed. In HCC patients, bleeding with a fatal outcome from any site was reported in 2.4% for Nexavar and 4% in placebo. The incidence of treatment-emergent cardiac ischemia/infarction was 2.7% for Nexavar vs. 1.3% for placebo. In RCC patients, incidence of bleeding regardless of causality was 15% for Nexavar vs. 8% for placebo and the incidence of treatment-emergent cardiac ischemia/infarction was 2.9% for Nexavar vs. 0.4% for placebo. Most common adverse events 20% related to Nexavar for both HCC and RCC were fatigue, weight loss, rash/desquamation, hand-foot skin reaction, alopecia, diarrhea, nausea, and abdominal pain. Grade 3/4adverse events in HCC and RCC patients, respectively, were 45% for Nexavar vs. 32% for placebo and 38% for Nexavar and 28% for placebo. Women of child-bearing potential should be advised to avoid becoming pregnant and advised against breast-feeding. In cases of any severe or persistent side effects, temporary treatment interruption, dose modification or permanent discontinuation should be considered.

For information about Nexavar including U.S. Nexavar prescribing information, visit www.nexavar.com<http://nexavar.com/scripts/pages/en/index.php> or call 1.866.NEXAVAR (1.866.639.2827).

About Bayer HealthCare Pharmaceuticals Inc. Bayer HealthCare Pharmaceuticals Inc. is the U.S.-based pharmaceuticals unit of Bayer HealthCare LLC, a division of Bayer AG. One of the world’s leading, innovative companies in the healthcare and medical products industry, Bayer HealthCare combines the global activities of the Animal Health, Consumer Care, Diabetes Care, and Pharmaceuticals divisions. In the U.S., Bayer HealthCare Pharmaceuticals comprises the following business units: Women’s Healthcare, Diagnostic Imaging, Specialized Therapeutics, Hematology/Cardiology and Oncology. The company’s aim is to discover and manufacture products that will improve human health worldwide by diagnosing, preventing and treating diseases.

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® (sorafenib) tablets, a small molecule drug. For more information about Onyx, visit the company's website at www.onyx-pharm.com<http://www.onyx-pharm.com/view.cfm/1/Homepage>.

Forward Looking Statements This news release may contain forward-looking statements based on current assumptions and forecasts made by Bayer Group or subgroup management. Various known and unknown risks, uncertainties and other factors could lead to material differences between the actual future results, financial situation, development or performance of the company and the estimates given here. These factors include those discussed in Bayer’s public reports which are available on the Bayer Web site at www.bayer.com. The company assumes no liability whatsoever to update these forward-looking statements or to conform them to future events or developments.

This news release also contains “forward-looking statements” of Onyx within the meaning of the federal securities laws. These forward-looking statements include without limitation, statements regarding timing, progress and results of the clinical development, safety, regulatory processes, commercialization efforts or commercial potential of Nexavar. These statements are subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated. Reference should be made to Onyx’s Annual Report on Form 10-K for the year ended December 31, 2008, filed with the Securities and Exchange Commission under the heading “Risk Factors” and Onyx’s Quarterly Reports on Form 10-Q for a more detailed description of such factors. Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date of this release. Onyx undertakes no obligation to update publicly any forward-looking statements to reflect new information, events, or circumstances after the date of this release except as required by law.

Nexavar® (sorafenib) tablets is a registered trademark of Bayer Healthcare Pharmaceuticals, Inc.

Posted: September 2009

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