Further, 16 proteins (PRSS8, MK, WFDC2 (HE4), IL-10, ADM, IDUA, MMP-7, FABP4, PCSK9, ST2, CTSZ, CCL16, Dkk-4, VEGF-A, IL-6, HGF) were selected from the comparison of EC with benign tumors (Table 3). Here, PCSK9 is linked to benign neoplasm.