Risk score by the 3-miRNA classifier, time-dependent ROC curves, and Kaplan-Meier PFS curves in the discovery cohort and the independent validation cohort. Risk score, time-dependent ROC curves, and PFS curves for the discovery cohort (A-C) and the validation cohort (D-F). The AUC was calculated for the ROC curves at 3, 5, or 7 years to assess prognostic accuracy (B,E). We calculated P values using the log-rank test (C,F). AUC, area under the curve.