(A) Progression-free survival curve in stage III/IV serous ovarian cancers patients with high K5/6 immunostaining (≥ 10%, n = 30) and low K5/6 immunostaining (< 10%, n = 73, P = 0.014, log rank test). (B) Overall survival curve in stage III/IV serous ovarian cancers patients with high K5/6 immunostaining (> 10%, n = 33) and low K5/6 immunostaining (< 10%, n = 80, P = 0.673, log rank test). (C) Progression-free survival curve in stage III/IV serous ovarian cancers patients with high K5 immunostaining (≥ 10%, n = 63) and low K5 immunostaining (< 10%, n = 31, P = 0.015, log rank test). (D) Overall survival curve in stage III/IV serous ovarian cancers patients with high K5 immunostaining (≥ 10%, n = 69) and low K5 immunostaining (< 10%, n = 18, P = 0.144, log rank test).