Pembrolizumab with or without radiation therapy for metastatic non-small cell lung cancer: a randomized phase I/II trial ======================================================================================================================== * James Welsh * Hari Menon * Dawei Chen * Vivek Verma * Chad Tang * Mehmet Altan * Kenneth Hess * Patricia de Groot * Quynh-Nhu Nguyen * Rejani Varghese * Nathan I Comeaux * George Simon * Ferdinandos Skoulidis * Joe Y Chang * Vasiliki Papdimitrakopoulou * Steven H Lin * John V Heymach