Figure 2. Kaplan-Meier survival analysis of Nrf2, HO-1 and Rap1b expression levels. (A) Differences in the cumulative OS among patients with Nrf2 protein expression. (B) Differences in the cumulative OS among patients with HO-1 protein expression. (C) Differences in cumulative OS among patients with Nrf2 and Rap1b protein expression. The P-value was obtained using the log-rank test of the difference. (**P<0.001).