PF-06863135 (PF-3135) is a bispecific, humanized, monoclonal antibody consisting of BCMA and CD3-targeting arms paired on an IgG2a backbone by hinge-mutation technology. Noopur Raje, MD, Massachusetts General Hospital, Boston, MA, discusses the dose-escalation portion of an ongoing phase I study (NCT03269136) of PF-3135 in patients with relapsed/refractory multiple myeloma (MM). Early data show that treatment with intravenous PF-3135 was well tolerated at the dose levels evaluated. This interview took place at the American Society of Hematology (ASH) 2019 Annual Meeting and Exposition in Orlando, FL.