To evaluate the safety and efficacy of PD-1 immune checkpoint inhibitor combined with intensity modulated radiation therapy in the treatment of intermediate-risk nasopharyngeal carcinoma (T2-3N0 or T1-2N1 stage and EBV-DNA≤4000 copy/ml).The primary end point is safety, the secondary end points are short-term efficacy,overall survival (OS), progression-free survival (PFS),Distant metastasis-free survival(DMFS),adverse effects ,quality of life and immune status assessment.
To evaluate the safety and efficacy of PD-1 immune checkpoint inhibitor combined with intensity modulated radiation therapy in the treatment of intermediate-risk nasopharyngeal carcinoma (T2-3N0 or T1-2N1 stage and EBV-DNA≤4000 copy/ml).