The study of women with and without ovarian cancer included urine samples for analysis of estrogen metabolites, conjugates and depurinating DNA adducts, as well as saliva samples for purification of DNA and analysis of single nucleotide polymorphisms (SNPs) in several genes for the enzymes involved in estrogen metabolism, CYP1B1 and COMT [49]. Here, CYP1B1 is linked to ovarian cancer.