RASSF2 and ovarian endometriosis: The combination of Methylated CpG island amplification and representative difference analysis (DDA) has enabled the discovery of nine candidate genes, namely RASSF2, SPOCK2, RUNX3, GSTZ1, CYP2A, GBGT1, NDUFS1, ADAM22, and TRIM36, that exhibit distinctive methylation patterns associated with the malignant transformation of ovarian endometriosis (60).