Prognostic value of preoperative carcinoembryonic antigen/tumor size in rectal cancer

Figure 4 Kaplan-Meier survival curves and risk tables for disease-free survival. A: Kaplan-Meier survival curves and risk table for disease-free survival (DFS) in the training cohort. The 5-year DFS of the high and low CEA/tumor size groups were 52.5% and 71.9% (P = 0.02), respectively. B: Kaplan-Meier survival curves and risk table for DFS in the validation cohort. The 5-year DFS of the high and low CEA/tumor size groups were 50.3% vs 79.3% (P = 0.002), respectively. The log-rank test was used to calculate the P-value. DFS: Disease-free survival; CEA: Carcinoembryonic antigen.