Figure 2. Recurrence hazard curves for overall patients.

(A) The hazard of any recurrence demonstrates a peak at the second year after surgery. It declines thereafter but maintains a certain level. (B) The hazard of locoregional recurrence has no evident peak and exhibits a gradual decline. (C) The hazard of distant recurrence shows a significant peak at the second year after surgery and a gradual decrease thereafter, which is similar to the hazard of any recurrence.