Time-to-event curves according to the prognostic index in the training data set. (A) OS of risk groups of the training data set according to the prognostic index (score population: N = 1223); (B) PFS of patients starting treatment according to the prognostic index (training data set N = 807); (C) TFS of untreated patients according to the prognostic index (training data set N = 416).