Fig. 3

Kaplan–Meier survival curves for the high-risk group and low-risk group. A Disease-free survival, B distant metastasis-free survival, C overall survival, and D locoregional relapse-free survival high-risk group, T4 disease with EBV DNA ≥ 4000 copy/mL; low-risk group, T1–3 disease regardless of EBV DNA and T4 disease with EBV DNA < 4000 copy/mL