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Seattle Genetics and Merck Announce Two Strategic Oncology Collaborations

Companies to Co-Develop and Co-Commercialize Seattle Genetics’ Antibody-Drug Conjugate Ladiratuzumab Vedotin Globally; Merck to Acquire $1 Billion Equity Stake in Seattle Genetics Common Stock

Companies Enter Exclusive License and Co-Development Agreement to Accelerate Global Reach of TUKYSA for HER2-Postive Cancers in Regions Outside the United States, Canada and Europe


Seattle Genetics, Inc. (Nasdaq: SGEN) and Merck (NYSE: MRK), known as MSD outside the United States and Canada, today announced two new strategic oncology collaborations.

The companies will globally develop and commercialize Seattle Genetics’ ladiratuzumab vedotin, an investigational antibody-drug conjugate (ADC) targeting LIV-1, which is currently in phase 2 clinical trials for breast cancer and other solid tumors. The collaboration will pursue a broad joint development program evaluating ladiratuzumab vedotin as monotherapy and in combination with Merck’s anti-PD-1 therapy KEYTRUDA® (pembrolizumab) in triple-negative breast cancer, hormone receptor-positive breast cancer and other LIV-1-expressing solid tumors. Under the terms of the agreement, Seattle Genetics will receive a $600 million upfront payment and Merck will make a $1.0 billion equity investment in 5.0 million shares of Seattle Genetics common stock at a price of $200 per share. In addition, Seattle Genetics is eligible for progress-dependent milestone payments of up to $2.6 billion.

Separately, Seattle Genetics has granted Merck an exclusive license to commercialize TUKYSA® (tucatinib), a small molecule tyrosine kinase inhibitor, for the treatment of HER2-positive cancers, in Asia, the Middle East and Latin America and other regions outside of the U.S., Canada and Europe. Seattle Genetics will receive $125 million from Merck as an upfront payment and is eligible for progress-dependent milestones of up to $65 million.

“Collaborating with Merck on ladiratuzumab vedotin will allow us to accelerate and broaden its development program in breast cancer and other solid tumors, including in combination with Merck’s KEYTRUDA, while also positioning us to leverage our U.S. and European commercial operations,” said Clay Siegall, Ph.D., President and Chief Executive Officer of Seattle Genetics. “The strategic collaboration for TUKYSA will help us reach more patients globally and benefit from the established commercial strength of one of the world’s premier pharmaceutical companies.”

“These two strategic collaborations will enable us to further diversify Merck’s broad oncology portfolio and pipeline, and to continue our efforts to extend and improve the lives of as many patients with cancer as possible,” said Dr. Roger M. Perlmutter, President, Merck Research Laboratories. “We look forward to working with the team at Seattle Genetics to advance the clinical program for ladiratuzumab vedotin, which has shown compelling signals of efficacy in early studies, and to bring TUKYSA to even more patients with cancer around the world.”

investor.seattlegenetics.com
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