programmed cell death-1 (PD-1) inhibitors has been recommended as the first-line treatment for recurrent/metastatic nasopharyngeal carcinoma (R/M NPC), but progression-free survival (PFS) and overall survival (OS) was still unsatisfactory. Basic studies have already confirmed PD-1 inhibitors had concurrent synergistic effect with chemotherapy and radiotherapy. Few studies concerned about the treatment pattern for concurrent PD-1 inhibitors combination with chemoradiation for R/M NPC. There was still much uncertainties about the timing, fraction dose and total dose for PD-1 inhibitors combination with radiation. Therefore, we aimed to explore the substantial effect and toxicity of this new pattern for R/M NPC.