Feature importance
tumor, T4 stage
TUMOR
The feature importance plot shows the contribution of each feature in the prognostic model. N2 stage, M1 stage, and no surgery occupied the top three positions in the feature importance ranking; this ranking was consistently observed across the four models. In the CoxPH model, T4 stage, and tumor primary location (lower and upper) were more important than other features. In the machine learning survival model, the most important features were chemotherapy, tumor size, grade unknown, and sex (Fig. Feature importance plot of the CoxPH (