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Association of COMT Val158Met polymorphism and breast cancer risk: an updated meta-analysis

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Catechol-O-methyltransferase ( COMT ) is one of the most important enzymes involved in estrogen metabolism and its functional genetic polymorphisms may be associated with breast cancer ( BC ) risk. Many epidemiological studies have been conducted to explore the association between the COMT Val158Met polymorphism and breast cancer risk. However, the results remain inconclusive. In order to derive a more precise estimation of this relationship, a large meta-analysis was performed in this study. Methods Systematic searches of the PubMed, Embase and Cochrane Library were performed. Crude odds ratios (ORs) with 95% confidence intervals (CIs) were calculated to estimate the strength of the association. Results A total of 56 studies including 34,358 breast cancer cases and 45,429 controls were included. Overall, no significant associations between the COMT Val158Met polymorphism and breast cancer risk were found for LL versus HH, HL versus HH, LL versus HL, recessive model LL versus HL+HH, and dominant model LL+HL versus HH. In subgroup analysis by ethnicity, source of controls, and menopausal status, there was still no significant association detected in any of the genetic models. Conclusion Our meta-analysis results suggest that the COMT Val158Met polymorphism may not contribute to breast cancer susceptibility. Virtual slides The virtual slides(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs4806123577708417
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Qinet al. Diagnostic Pathology2012,7:136 http://www.diagnosticpathology.org/content/7/1/136
R E S E A R C HOpen Access Association ofCOMTVal158Met polymorphism and breast cancer risk: an updated metaanalysis 11,5231 11 11 Xue Qin, Qiliu Peng, Aiping Qin, Zhiping Chen, Liwen Lin , Yan Deng , Li Xie , Juanjuan Xu , Haiwei Li , 1 1*4* Taijie Li , Shan Liand Jinmin Zhao
Abstract Background:CatecholOmethyltransferase (COMT) is one of the most important enzymes involved in estrogen metabolism and its functional genetic polymorphisms may be associated with breast cancer (BC) risk. Many epidemiological studies have been conducted to explore the association between theCOMTVal158Met polymorphism and breast cancer risk. However, the results remain inconclusive. In order to derive a more precise estimation of this relationship, a large metaanalysis was performed in this study. Methods:Systematic searches of the PubMed, Embase and Cochrane Library were performed. Crude odds ratios (ORs) with 95% confidence intervals (CIs) were calculated to estimate the strength of the association. Results:A total of 56 studies including 34,358 breast cancer cases and 45,429 controls were included. Overall, no significant associations between theCOMTVal158Met polymorphism and breast cancer risk were found for LL versus HH, HL versus HH, LL versus HL, recessive model LL versus HL+HH, and dominant model LL+HL versus HH. In subgroup analysis by ethnicity, source of controls, and menopausal status, there was still no significant association detected in any of the genetic models. Conclusion:Our metaanalysis results suggest that theCOMTVal158Met polymorphism may not contribute to breast cancer susceptibility. Virtual slides:The virtual slides(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/ vs4806123577708417 Keywords:COMT, Polymorphism, Breast cancer, Metaanalysis
Introduction Breast cancer is one of the most frequently occurring cancer and cancerrelated deaths are highly prevalent worldwide, which has become a major public health challenge [1]. The mechanism of developing breast can cer is still unclear. It has been widely accepted that ex posure to circulating estrogen may be important in the development of breast cancer. Since estrogen biosyn thesis and metabolism consist of many translation and transcription steps, the genes involved in these processes may contribute to the level of estrogen and thereby
* Correspondence: lis8858@126.com; zhaojinmin@126.com Equal contributors 1 Department of Clinical Laboratory, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, Guangxi, China 4 Department of Orthopedic Trauma Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, Guangxi, China Full list of author information is available at the end of the article
influence the susceptibility to breast cancer. Among the genes identified,BRCA1andBRCA2mutations have been reported to be associated with a dominantly inherited increased risk of the disease. However, they only account for about 5% of breast cancer occur rences [2]. This fact leaves the possibility that low penetrance genetic factors are likely to explain most of disease cases. CatecholOmethyltransferase (COMT) is an import ant phase II enzyme involved in the conjugation and in activation of catechol estrogens [3].COMTis expressed at high levels in a variety of human tissues including liver, kidney, breast, and red blood cells [4]. TheCOMT gene is located on chromosome 22q11 [5]. A G to A transition in theCOMTgene results in valine to methio nine amino acid change in codon 108/158 in the cyto solic/membranebound form of the protein. This amino
© 2012 Qin et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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