3.1. Patient Characteristics
tumor-related
We screened 3566 patients with CRC, and 2279 eligible patients were enrolled in our study. All eligible patients were recruited from Wuhan Union Medical College Hospital. In a ratio of 7 : 3, 1595 patients were allocated to the training group and 684 to the testing group. The detailed screening process is shown in The demographic, clinical, and tumor-related characteristics of the patients included in the study are summarized in 
