GPC Biotech to Host Investor Event in Chicago on June 4th during ASCO Annual Meeting

29 mei 2007 Martinsried/Munich (Germany) and Princeton, N.J., May 29, 2007 - GPC Biotech AG (Frankfurt Stock Exchange: GPC; TecDAX index; NASDAQ: GPCB) today announced that the Company will host an investor event on Monday, June 4, 2007, 6:00-7:30 pm Central Time (June 5, 2007 at 1 am CEST) during the ASCO Conference in Chicago, IL. The event will be webcast live and will be accessible through the GPC Biotech Web site at www.gpc-biotech.com. A replay will also be available via the Web site. Cora Sternberg, M.D., FACP, Chief of the Department of Medical Oncology at the San Camillo and Forlanini Hospitals, Rome, Italy is a confirmed guest speaker for the event and will discuss the investigational drug, satraplatin as well as lead a general discussion regarding the treatment of hormone-refractory prostate cancer. Dr. Sternberg is a leading authority in the treatment of genitourinary cancers and one of the principal investigators of the SPARC registrational trial. Dr. Sternberg will give a podium presentation on data from the SPARC trial at the ASCO Annual Meeting Members of the GPC Biotech senior management team will also be available to discuss corporate activities. 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. Satraplatin was in-licensed from Spectrum Pharmaceuticals, Inc. 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 about the status of the FDA review process. 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, 2005 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. Satraplatin has not yet been approved by the FDA in the U.S., the EMEA in Europe or any other regulatory authority and no conclusions can or should be drawn regarding its safety or effectiveness. Only the relevant regulatory authorities can determine whether satraplatin is safe and effective for the use(s) being investigated. Contacts: GPC Biotech AG Martin Braendle Director, Investor Relations & Corporate Communications Phone: +49 (0)89 8565 2693 ir@gpc-biotech.com In the U.S.: Laurie Doyle Director, Investor Relations & Corporate Communications Phone: +1 609 524 5884 usinvestors@gpc-biotech.com --- End of Message --- GPC Biotech AG Fraunhoferstr. 20 Martinsried WKN: 585150; ISIN: DE0005851505; Index: CDAX, MIDCAP, Prime All Share, TecDAX, HDAX, TECH All Share; Listed: Prime Standard in Frankfurter Wertpapierbörse, Freiverkehr in Börse Berlin Bremen, Freiverkehr in Bayerische Börse München, Freiverkehr in Börse Düsseldorf, Freiverkehr in Börse Stuttgart, Freiverkehr in Hanseatische Wertpapierbörse zu Hamburg, Geregelter Markt in Frankfurter Wertpapierbörse;