3.1 Feature extraction and selection
We extracted 254 radiomic features from each ROI in CT images and
collected 11 clinicopathological parameters for analysis. Table 1 shows
the differences in 11 clinicopathological parameters between two groups
of patients stratified by four clinical endpoints. The selected radiomic
features and/or clinicopathological parameters in each model for four
clinical endpoints are in Supplementary Table S1.