Moreover, microsatellite analysis has demonstrated that loss of heterozygosity on p16 (Ink4), GALT (galactose-1-phosphate uridylyltransferase) and p53, as well as on APOA2 (apolipoprotein A), a region frequently lost in ovarian cancer, occurs in endometriosis [37]. This evidence concerns the gene CDKN2A and ovarian carcinoma.