Figure 1

Kaplan-Meier survival analysis in patients with stage II ESCC. (A) Overall survival curve for whole cohort of patients with stage II ESCC; (B) Overall survival curve for whole cohort of patients with stage II ESCC according to the preoperative serum level of Cyfra21-1; (C) Overall survival curve for whole cohort of patients with stage II ESCC according to the preoperative serum level of SCC-Ag; (D) Overall survival curve for whole cohort of patients with stage II ESCC according to the preoperative serum level of Cyfra21-1 and SCC-Ag (double-normal subset vs. either-normal subset vs. double-high subset).