( BOTHELL Wash. & LOS ANGELES--(BUSI...)Seattle Genetics Highlights Data on its Proprietary Antibody-Drug,Conjugate Technology at AACR,Health

BOTHELL, Wash. & LOS ANGELES--(BUSINESS WIRE)--Apr 17, 2007 - Seattle Genetics, Inc. (Nasdaq: SGEN) today announced data from fifteen presentations by the company and its collaborators at the 2007 Annual Meeting of the American Association for Cancer Research (AACR) demonstrating preclinical advances with its proprietary antibody-drug conjugate (ADC) technology and cancer product pipeline.

ADCs are monoclonal antibodies linked to cell-killing drugs. Seattle Genetics' ADC technology employs synthetic, highly potent drugs that are bound to monoclonal antibodies through proprietary linker systems. The linkers are designed to be stable in the bloodstream but to release the drug payload under specific conditions once inside target cells, thereby sparing non-target cells many of the toxic effects of traditional chemotherapy.

"Empowered antibodies utilizing our ADC technology have the potential to significantly impact the way cancer is treated," said Clay B. Siegall, Ph.D., President and Chief Executive Officer at Seattle Genetics. "Our strong presence at AACR this year reflects continued progress with our proprietary and partnered ADC programs. We expect to report clinical data from the ongoing phase I dose-escalation trial of SGN-35, our lead ADC, later this year, while both we and our collaborators continue to advance additional ADC programs into and towards the clinic."

ADC Programs

Researchers reported preclinical data at AACR describing how changes in the structure of the attached drugs can affect ADC efficacy and tolerability, the impact that linker structure and these modifications can have on ADC activity, and the ability of Seattle Genetics' ADC technology to effectively deliver active drugs to target tissue while avoiding non-targeted drug release. (Abstracts #4793, #916 and #4088) Further data from preclinical models of ADCs provide mechanistic insight into how and when drugs are r
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