In total, 19 candidate genes (ACSS1, AK5, ALCAM, CHRD, CLDN1, CLDN16, GALNT10, HERC5, LAMB1, NFE2L3, OSTF1, PGM2, PODXL, PRKD3, SLC4A8, THBS1, CPT1A, ATP1B1, ABCB1) were confirmed according to our previously mentioned criteria (Figure 1A); among them, CPT1A, ATP1B1, ABCB1 were considered as PRGs in ovarian cancer. Here, CLDN1 is linked to ovarian cancer.