Enrolled patients with complete metabolic response (CMR) and more than 70% partial metabolic response (PMR) according to PERCIST criteria at the 25th fraction will receive intensity modulated radiation therapy (IMRT) of reduced-dose (prescribed dose, 63.6 Gy, 2.12 Gy per fractions, 30 fractions), for those who with ≤70% PMR will receive conventional dose (prescribed dose, 70Gy, 2.12 Gy per fractions, 33 fractions).
The purpose of this study is to explore whether 18F-FDG PET/CT guided reduced-dose radiotherapy would maintain survival outcomes in nasopharyngeal carcinoma (NPC) patients.