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Mol. Hum. Reprod. Advance Access published online on November 16, 2005
Molecular Human Reproduction, doi:10.1093/molehr/gah206
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© The Author 2005. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received March 15, 2005
Accepted July 6, 2005

Article

Glutathione S-transferases M1/T1 gene polymorphisms and endometriosis: a meta-analysis of genetic association studies

Sun-Wei Guo 1 *

1 Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, USA

* To whom correspondence should be addressed.
Sun-Wei Guo, E-mail: swguo{at}mail.mcw.edu


  Abstract

In view of the controversies surrounding the glutathione S-transferases (GST) M1/T1-endometriosis association, a meta-analysis of the GSTM1/GSTT1 genetic association studies of endometriosis was performed. In this meta-analysis involving 14 GSTM1 studies with 1539 cases and 1805 controls and nine GSTT1 studies with 746 cases and 834 controls, respectively, substantial heterogeneities among studies were found. In addition, asymmetry in funnel plot was evident, which is likely to stem from publication bias, given no apparent indication of true heterogeneity. The bias appears to be prominent for GSTM1 studies, but is less so for GSTT1 studies. After correction for this bias, there is no evidence that women with GSTM1 null genotype have increased risk of developing endometriosis as compared with women with other genotypes. For GSTT1, the risk associated with the null genotype is 29% higher than other genotypes. However, even this estimate should be viewed with a large grain of salt, because the estimate could easily lose its statistical significance if there is a realistic 69-80% publication probability.

Keywords: association/endometriosis/genetic/glutathione S-transferase/GSTM1/GSTT1/meta-analysis/polymorphism.
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