BOTHELL, Wash. & TOKYO–(BUSINESS WIRE)–Seattle Genetics, Inc. (Nasdaq:SGEN) and Astellas Pharma Inc. (TSE: 4503, President and CEO: Kenji Yasukawa, Ph.D., “Astellas”) today announced that the U.S. Food and Drug Administration (FDA) has granted Breakthrough Therapy designation for PADCEV™ (enfortumab vedotin-ejfv) in combination with Merck’s (known as MSD outside the United States and Canada) anti-PD-1 therapy KEYTRUDA® (pembrolizumab) for the treatment …