Fig. 4

Further verification of the risk model. A, B Univariable Cox (A) and multivariable Cox regression analysis (B); C The ROC curves of the risk model at 1, 3, and 5 years; D The ROC curves of the clinical features and risk score; E The C-index curves of the clinical features and risk score; F–I Kaplan–Meier survival curves of the risk model classified by age and gender, respectively