Fig. 1

Kaplan–Meier Analysis-based Estimates of Survival Based on Prognostic Factors. 1-1. Comparison of survival between patients having small (≤3 cm) primary tumors (blue) and those having large (>3 cm) primary tumors (red). 1-2. Comparison of survival between patients having single sites of a distant metastasis (blue) and those having multiple (two or more) sites of distant metastases (red). P-values were determined by the log-rank test; the number of individuals and the survival times (median (95 % confidence interval), months (mo)) in each group are indicated