Seattle Genetics to Present at the Needham Cancer Therapeutics Conference

Seattle Genetics, Inc. (NASDAQ:SGEN) announced today that Thomas C. Reynolds, M.D., Ph.D., Chief Medical Officer, will speak at the Needham & Company Cancer Therapeutics: Today and Tomorrow conference on Thursday, March 26, 2009 at 9:20 a.m. Eastern time. A live webcast of the presentation will be available from Seattle Genetics’ website, www.seattlegenetics.com, under the “News and Investor Information” section.

About Seattle Genetics

Seattle Genetics is a clinical stage biotechnology company focused on the development and commercialization of monoclonal antibody-based therapies for the treatment of cancer and autoimmune disease. The company’s lead product candidate, SGN-35, is in a pivotal trial under a Special Protocol Assessment with the FDA. SGN-35 is empowered by Seattle Genetics’ proprietary antibody-drug conjugate (ADC) technology comprising highly potent synthetic drugs and stable linkers for attaching the drugs to monoclonal antibodies. In addition, Seattle Genetics has three other product candidates in ongoing clinical trials: dacetuzumab (SGN-40), lintuzumab (SGN-33) and SGN-70. Dacetuzumab is being developed under a worldwide collaboration with Genentech. Seattle Genetics has collaborations for its ADC technology with a number of leading biotechnology and pharmaceutical companies, including Genentech, Bayer, CuraGen, Progenics, Daiichi Sankyo and MedImmune, a subsidiary of AstraZeneca, as well as an ADC co-development agreement with Agensys, a subsidiary of Astellas Pharma. More information can be found at www.seattlegenetics.com.