of marginal significanceP = 0.075
Multivariate analyses showed that dose painting was a significant independent prognostic factor for 3-year LFFS and DFS ( P = 0.039 and P = 0.036, respectively); EBV DNA concentration was a significant independent prognostic factor for 3-year LFFS, DFS, DMFS and OS ( P = 0.022, P < 0.001, P = 0.003 and P = 0.003, respectively), and dose painting was of marginal significance in predicting DMFS and OS ( P = 0.075, P = 0.052, respectively).