Carcinogenesis, Vol. 22, No. 1, 63-66,
January 2001
© 2001 Oxford University Press
CANCER BIOLOGY |
GSTM1 null polymorphism and susceptibility to endometriosis and ovarian cancer
1 VBCRC Cancer Genetics Laboratory, Peter MacCallum Cancer Institute, Locked Bag No. 1 A'Beckett St., Victoria 8006, Australia and
2 Obstetrics and Gynaecology, University of Southampton, Princess Anne Hospital, Coxford Road, Southampton SO16 5YA, UK
It is likely that heritable genetic factors contribute to the development of endometriosis, which is a putative precursor of the endometrioid and clear cell histological subtypes of ovarian cancer. The phase II glutathione S-transferases (GSTs) are a family of enzymes responsible for metabolism of a broad range of xenobiotics and carcinogens. Allelic variants of GSTs that have impaired detoxification function may increase the rate of genetic damage and thereby increase the susceptibility to cancer. The null genetic polymorphism in the gene encoding the GST class µ (GSTM1) enzyme has been reported to be significantly elevated in endometriosis patients and may represent an endometriosis susceptibility allele. In this study the frequency of the GSTM1 null genotype was investigated in 84 cases of endometriosis, 293 cases of ovarian cancer and 219 controls. All cases and controls were derived from women resident in the south east of England. The frequency of the GSTM1 null allele was not over-represented in the endometriosis patients (47.6%) compared with the controls (48.9%) (P = 0.898). In the ovarian cancer group the GSTM1 null genotype was significantly elevated compared with controls (59.0 versus 48.9%, P = 0.025). When stratified according to histological subtype a significantly increased GSTM1 null genotype was only observed for the endometrioid (65.4%, P = 0.013) and the combined endometrioid/clear cell ovarian cancers (67.0%, P = 0.004). We conclude that the GSTM1 null allele is not an endometriosis susceptibility allele, however, it may predispose endometriotic lesions to malignant transformation to endometrioid and clear cell ovarian cancer.
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