Fig. 4

Top 10 random survival forest features with importance ranking. Box-Whisker Plots depict the importance value of each feature for each subgroup either ranked according to the mean (A) or median (B) of the Monte Carlo 100 random split cross-validation. In (B) the surgery and RT cohort did not yield any non-zero feature in the median ranked approach. In (C) the Cox-Survival (Harrel’s) C (AUC) is shown for each 100× iterated model. Only features with an importance value >0 are shown