Kaplan-Meier curves of the prognostic model. PFS analysis in the training (A) and independent validation cohort (B). OS analysis in the training (C) and independent validation cohort (D). The size of the high- and low-risk groups were defined according to the percentage of patients with a PFS event in the training cohort, which was 23%. The respective percentage of patients with the highest prediction scores from the logistic regression was classified as high risk.