- Meet at least one factor below :1 primary tumor SUVmax>10 in 18F-FDG PET/CT;2 primary tumor volume＞30cm3;3 mutiple metastatic cervical lymph node with at least one's short diameter＞4cm; 4 T4N2M0; 5 T1-4N3M0;6 EBV-DNA＞2×10E4 copy/l