Of these, 15 proteins (PRSS8, MK, WFDC2 (HE4), IL-10, SOD2, PARP-1, hK11, PVRL4, MUC-16 (CA125), FR-alpha, CDH3, NTRK3, IL-8, IL-17C, EN-RAGE) were selected from the comparison between OC stage I–IV and benign tumors (Table 2). Here, KLK11 is linked to benign neoplasm.