Kaplan-Meier estimates of the survivor function for method A on each validation dataset for the 4 hypotheses. a: MSK test set all stages, b: MSK test set with covariates all stages, c: MSK test set stage 1 only, d: MSK test set stage 1 only with covariates, e: CAN/DF test set all stages, f: CAN/DF test set with covariates all stages, g: CAN/DF test set stage 1 only, h: CAN/DF test set stage 1 only with covariates.