Figure 4. Comparison of overall survival according to a new combined prognostic model.

The new combined model (including pN classification and vascular invasion) could significantly stratify the risk (low, intermediate and high) for overall survival of ESCC patients in training cohort (A) and validation cohort (B). The proposed model could significantly discriminate the risk (low, intermediate and high) for recurrence-free survival of ESCC patients in training cohort (C) and validation cohort (D).