Fig. 3From: Development and validation of a nomogram for predicting the survival of patients with non-metastatic nasopharyngeal carcinoma after curative treatmentKaplan–Meier OS curves of non-metastatic NPC patients in each stage stratified by the scores of risk (0–12, 13–18, 19–24, 25–31, and ≥32) in the internal validation cohort (a) and IMRT cohort (b) (pooled log-rank test)Back to article page