Kaplan-Meier survival curves illustrating the significance of NQO1 expression in ovarian carcinomas. (A) OS rates of patients with high (solid, n = 92) and low (dashed, n = 68) NQO1 expression. A: Log-rank = 21.699, P = 0.000. (B-C) High NQO1 expression was strongly associated with poor OS in early-stage (solid, n = 37) and late-stage (solid, n = 55). B: Log-rank = 6.527, P = 0.011; C: Log-rank = 4.806, P = 0.028. (D-F) High NQO1 expression was strongly associated with poor OS in G1 (solid, n = 10), G2 (solid, n = 29) and G3 (solid, n = 53). D: Log-rank = 4.359, P = 0.037; E: Log-rank = 7.020, P = 0.008; F: Log-rank = 5.978, P = 0.015).