Independent prognostic factors in the training cohort
The univariate Cox-Regression analysis showed a significant association between CSS and age at diagnosis, race, sex, tumor size, histologic grade, historic stage, chemotherapy and radiotherapy. Therefore, these variables formed the input for the multivariate Cox-Regression analysis, which revealed that age, race, tumor size, grade and radiotherapy (P<0.05) were independent prognostic factors (Table 2).
Table 2. Univariate and multivariate analysis for the training cohort.