Fig. 3

ROC curves for VER model versus 8th AJCC in the development cohort (P = 0.012) (A) and the validation cohort (P = 0.030) (B). Our model shows better discrimination with C-indexes of 0.77 (95% CI: 0.69–0.85 ) and 0.76 (95% CI: 0.66–0.86) than AJCC 8th staging with C-indexes of 0.64 (95% CI: 0.57–0.72) and 0.64 (95% CI: 0.54–0.74) in the development cohort and validation cohort, respectively