A Randomised, Multicentre, Phase II Trial of Camrelizumab with or without Metastasis-directed Stereotactic Body Radiotherapy in Recurrent or Metastatic Nasopharyngeal Carcinoma

To investigate the efficacy of metastasis-directed therapy (MDT) when added to camrelizumab (Cam) in patients with recurrent or metastatic nasopharyngeal carcinoma (R/M-NPC).