PDCD1 and nasopharyngeal carcinoma: Among 131 patients across four cohorts (PD-1-treated recurrent/metastatic nasopharyngeal carcinoma [NPC], PD-1-naïve NPC, recurrent/metastatic endometrial cancer [EC], and other tumors), ORR was 34.1%, 45.8%, 38.5%, and 13.5%, respectively.