Pembrolizumab in patients with programmed death ligand 1–positive advanced ovarian cancer: Analysis of KEYNOTE-028. - Varga, Andrea; Piha-Paul, Sarina; Ott, Patrick A.; Mehnert, Janice M.; Berton-Rigaud, Dominique; Morosky, Anne; Yang, Ping; Ruman, Jane; Matei, Daniela (Gynecologic Oncology, 2019)