Pembrolizumab in Patients With Advanced Triple-Negative Breast Cancer: Phase Ib KEYNOTE-012 Study. - Nanda R; Chow LQ; Dees EC; Berger R; Gupta S; Geva R; Pusztai L; Pathiraja K; Aktan G; Cheng JD; Karantza V; Buisseret L (Journal of clinical oncology : official journal of the American Society of Clinical Oncology, 2016)