GSTP1 and endometriosis: Inactivating gene mutations, polymorphisms, and allelic variants of the detoxification genes, including cytochrome P450 family (CYP1A1 and CYP2D6) and GST family (GSTT1, GSTP1, and GSTM1), which are associated with impaired functions, may be implicated in endometriosis susceptibility [27, 28].