On October 3, 2017, Pfizer, Inc. (“Pfizer”) filed a petition for inter partes review (“IPR”) against U.S. Patent No. 7,846,441 (“the ʼ441 patent”), assigned to Genentech, Inc. (“Genentech”), entitled “Treatment with anti-ErbB2 antibodies.” The ʼ441 patent is related to Genentech’s Herceptin® (trastuzumab) product. Last November, Pfizer announced positive results in a pivotal safety and efficacy





