Disease Survival
The specific survival curve for clinical T stage (Figure 1 ) showed significant differences in relation to clinical T stage (T4 vs. T1 p = 0.028) .
The Kaplan–Meier OS curve showed a significantly worse prognosis (log-rank; p = 0.0283) in the PM group (Figure 2) . The OS rates at 3 years, 5 years, and 10 years in the PM group were 58%, 46%, and 13%, respectively, while those in the WPM group were 78%, 72%, and 72%, respectively.
Kaplan-Meier analysis of DSS on the P stage in the PM group showed significant differences: P1 and P2 at 3, 5, and 10 years were respectively 40%, 30%, and 5%; and 6%, 0%, and 0%. The values for P3 were 0% at all corresponding periods of time (p = 0.016 ;Figure 3) .