Ursula A. Matulonis, MD, director, Gynecologic Oncology, Dana-Farber Cancer Institute, professor of medicine, Harvard Medical School, discusses initial safety and activity findings from a phase IB escalation study of mirvetuximab soravtansine, a folate receptor alpha-targeting antibody-drug conjugate, with pembrolizumab (Keytruda) in patients with platinum-resistant epithelial ovarian cancer.