Fig. 7

Kaplan-Meier survival estimates for NPC patients at different clinical stages in three separate cohorts stratified by subtypes according to the proposed classification. OS curves of NPC patients stratified by subtypes according to the proposed classification with stage I (P = 0.005, a; (P = 0.063, b; c), II (P = 0.057, d; P = 0.030, e; and P < 0.001, f), III (P < 0.001, g and h; P = 0.041, i), and IV disease (P < 0.001, j, k, and l) in the training, retrospective validation, and prospective validation cohorts, respectively. The log-rank test was used to calculate P values. *No test possible because there were no failures