RecruitingPhase 3Drug trialCamrelizumab Plus Stereotactic Body Radiotherapy vs Camrelizumab Alone For Oligometastatic Nasopharyngeal CarcinomaWe intend to compare the efficacy and safety of immunotherapy plus stereotactic body radiotherapy at oligometastatic lesions and immunotherapy alone among patients with oligometastatic nasopharyngeal carcinoma whose primary lesion has been well controlled after radical local-regional treatment through this multicenter randomized phase 3 trial.