Under Whole-course of Immunotherapy, Gradient Fractionated Radiotherapy with Concurrent Chemotherapy Versus Standard Fractionated Radiotherapy with Concurrent Chemotherapy for Locoregionally Advanced Nasopharyngeal Carcinoma Who Achieved Partial Response After Induction Chemotherapy: a Randomized, Open-label, Multicenter, Phase III Trial.
This prospective trial aims to enroll patients with stage III-IVA (AJCC 8th,) locoregionally advanced nasopharyngeal carcinoma (LANPC). Under the condition of full course of PD-1/PD-L1 blockades, patients who achieved radiological partial response after 3 cycles of platinum-based chemotherapy plus PD-1/PD-L1 blockades will be randomized in a 1:1 ratio to receive gradient radiotherapy (reducing the irradiation dose of PET-CT areas without metabolic abnormalities, while maintaining adequate irradiation dose of areas with metabolic abnormalities) or standard dose radiotherapy with concurrent chemotherapy. It is expected to provide a new therapeutic option for locally advanced nasopharyngeal carcinoma at moderate risk.
• Histologically confirmed non-keratinizing nasopharyngeal carcinoma (differentiated or undifferentiated type, i.e., WHO type II or type III).
• Tumor staged as III-IVA (AJCC 8th).
• Patients who achieved partial response according to the RECIST criteria on the basis of MRI, PET-CT and endoscopic biopsy after 3 cycles of induction therapy of platinum-based chemotherapy plus immunotherapy.
• Eastern Cooperative Oncology Group performance status ≤1.
• Age: 18-65 years old.
• Adequate organ function:
• Adequate marrow function: neutrocyte count≥4×10e9/L, hemoglobin ≥90g/L and platelet count ≥100×10e9/L.
• Adequate liver and kidney function: Alanine Aminotransferase (ALT)/ Aspartate Aminotransferase (AST) ≤2.5×upper limit of normal (ULN), and bilirubin ≤ 2.5×ULN.; creatinine clearance rate ≥ 60 ml/min or creatinine of no more than 1.5 times the upper normal limit.
• Patients must be informed of the investigational nature of this study and give written informed consent.