Press Release: GPC Biotech Announces that Partner Pharmion Submits European Marketing Application for Satraplatin

GPC Biotech Announces that Partner Pharmion Submits European Marketing Application for Satraplatin MARTINSRIED/MUNICH, Germany, June 26, 2007 -- PRINCETON, N.J. -- GPC Biotech AG today announced that its partner, Pharmion Corporation , has submitted a Marketing Authorization Application (MAA) to the European Medicines Agency (EMEA) for satraplatin in combination with prednisone for the treatment of patients with metastatic hormone refractory prostate cancer (HRPC) who have failed prior chemotherapy. This filing is based primarily on data from the SPARC Phase 3 registrational trial. "We are delighted that Pharmion has submitted the European marketing application for satraplatin," said Bernd R. Seizinger, M.D., Ph.D., Chief Executive Officer. "With over 60,000 people expected to die from prostate cancer in the European Union this year, there is an urgent need for new therapies. We believe that, if approved, satraplatin has the potential to become an important new treatment option for advanced prostate cancer patients who today have very little hope." GPC Biotech will receive an $8 million milestone payment from Pharmion in connection with EMEA's acceptance of this filing. Under the terms of GPC Biotech's agreement with Spectrum Pharmaceuticals, the acceptance of the MAA by the EMEA will also trigger payments by GPC Biotech to Spectrum in a total amount of $3.2 million, representing a direct milestone payment plus Spectrum's share of the $8 million milestone payment from Pharmion. About Satraplatin Satraplatin, an investigational drug, is a member of the platinum family of compounds. Platinum-based drugs are a critical part of modern chemotherapy treatments and are used to treat a wide variety of cancers. All platinum drugs currently on the market require intravenous administration. Satraplatin is an oral compound that clinical trial patients are able to take at home. Satraplatin is not currently approved by the FDA in the United States, by the EMEA in the European Union or any other regulatory authority and no conclusions can or should be drawn regarding its safety and efficacy. A Phase 3 registrational trial, called SPARC, is evaluating satraplatin plus prednisone versus placebo plus prednisone in 950 patients with hormone- refractory prostate cancer whose prior chemotherapy has failed. Data from the trial on progression-free survival and on safety have been presented at recent medical conferences. Satraplatin is currently under review by the U.S. FDA for hormone-refractory prostate cancer patients whose prior chemotherapy has failed. GPC Biotech has a co-development and license agreement with Pharmion GmbH, a wholly owned subsidiary of Pharmion Corporation, under which Pharmion has been granted exclusive commercialization rights to satraplatin for Europe and certain other territories. GPC Biotech in-licensed satraplatin from Spectrum Pharmaceuticals, Inc. in 2002. Satraplatin has been studied in clinical trials involving a range of tumors. Trials evaluating the effects of satraplatin in combination with radiation therapy, in combination with other cancer therapies and in a number of cancer types are underway or planned. About GPC Biotech GPC Biotech AG is a publicly traded biopharmaceutical company focused on discovering, developing and commercializing new anticancer drugs. GPC Biotech's lead product candidate satraplatin is currently under review by the U.S. FDA for hormone-refractory prostate cancer patients whose prior chemotherapy has failed. GPC Biotech is also developing a monoclonal antibody with a novel mechanism-of-action against a variety of lymphoid tumors, currently in Phase 1 clinical development, and has ongoing drug development and discovery programs that leverage its expertise in kinase inhibitors. GPC Biotech AG is headquartered in Martinsried/Munich (Germany), and has a wholly owned U.S. subsidiary headquartered in Princeton, New Jersey. For additional information, please visit GPC Biotech's Web site at www.gpc-biotech.com. This press release contains forward-looking statements, which express the current beliefs and expectations of the management of GPC Biotech AG, including statements relating to results of the SPARC trial and statements relating to the potential efficacy and safety profile of satraplatin. Such statements are based on current expectations and are subject to risks and uncertainties, many of which are beyond our control, that could cause future results, performance or achievements to differ significantly from the results, performance or achievements expressed or implied by such forward-looking statements. Actual results could differ materially depending on a number of factors, and we caution investors not to place undue reliance on the forward- looking statements contained in this press release. In particular, there can be no guarantee that additional information relating to the safety, efficacy or tolerability of satraplatin may be discovered upon further analysis of data from the SPARC trial or analysis of additional data from other ongoing clinical trials for satraplatin. Furthermore, we cannot guarantee that satraplatin will be approved for marketing in a timely manner, if at all, by regulatory authorities nor that, if marketed, satraplatin will be a successful commercial product. We direct you to GPC Biotech's Annual Report on Form 20-F for the fiscal year ended December 31, 2006 and other reports filed with the U.S. Securities and Exchange Commission for additional details on the important factors that may affect the future results, performance and achievements of GPC Biotech. Forward-looking statements speak only as of the date on which they are made and GPC Biotech undertakes no obligation to update these forward-looking statements, even if new information becomes available in the future. CONTACT: Martin Braendle, Director, Investor Relations & CorporateCommunications, +49 (0)89 8565-2693, ; In the U.S.:Laurie Doyle, Director, Investor Relations & Corporate Communications,+1-609-524-5884, , both of GPC Biotech AG;Additional Media Contacts: (In Europe) Brian Hudspith of Maitland, +44(0)20 7379 5151, ; (In the U.S.) David Schull ofRusso Partners, LLC, +1-212-845-4271, [email protected] [email protected] [email protected] [email protected]

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