3.1. Basic Patient Information
tumor, tumors, Tumor
TUMOR, TUMORS, TUMOR, METASTASIS
Both cohorts had a median age of 61 years, and they were predominantly male (62.6% and 64.2% in the training and validation cohorts, respectively), white (84.6% and 86.2%), and married (56.6% and 58.9%). Tumor size is mainly less than 2 cm (40.6% and 40.5%), followed by 2–4 cm (32.2% and 30.5%). AJCC tumor stages were evenly distributed. Most of the tumors were localized and regional, and few patients had distant metastasis. More patients in both cohorts received surgery (79.6% and 78.4%), fewer received chemotherapy (31.5% and 31.9%), about half of the patients received radiotherapy, and patients who received radiotherapy were more likely to receive it after surgery (31.5% and 31.9%) in both cohorts. Most patients opted for postoperative lymph node dissection (57.5% and 55.8%), and most had middle incomes in both cohorts (51.2% and 49.3%). The median survival times 