Reduced-dose Versus Conventional-dose Intensity-modulated Radiation Therapy for Locally Advanced Nasopharyngeal Carcinoma With Remission After Induction Chemotherapy and Immunotherapy
To explore the efficacy and safety of reduced-dose radiotherapy combined with concurrent chemotherapy and immunotherapy in stage Ⅳa (AJCC 8th,) locally advanced nasopharyngeal carcinoma patients who are sensitive to induction chemoimmunotherapy (assessed as complete response \[CR\]/partial response \[PR\] by imaging, with EBV DNA copy number reduced to zero or below the lower limit of detection), so as to provide a new treatment option for these patients.