3.2. Variable Selection
tumor, AJCC
REGRESSION, TUMOR
Age, AJCC stage, sex, SEER tumor stage, marital status, tumor size, surgery status, radiotherapy status, race, chemotherapy status, lymph node dissection status, radiotherapy sequence, and income were analyzed using multivariate Cox regression. The final screening results were as follows: age (hazard ratio (HR) = 1.032, 