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The association between two polymorphisms in the TYMS gene and breast cancer risk: a meta-analysis

  • Epidemiology
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Abstract

Thymidylate synthase (TYMS), which catalyzes the conversion of deoxyuridine monophosphate to deoxythymidine monophosphate, is a central enzyme in the folate metabolic pathway. Epidemiological studies have evaluated the association between TYMS gene polymorphisms and breast cancer susceptibility; however, the published data are still inconclusive. To derive a more precise assessment of this relationship, we performed a meta-analysis based on currently available data by searching PubMed, EMBASE databases, and the Cochrane Library. A total of 10 eligible studies were identified for the TYMS TSER polymorphism (six studies with 2,718 cases and 3,423 controls) and for the TYMS TS3′-UTR polymorphism (five studies with 1,969 cases and 2,290 controls). The overall odds ratio (OR) and the corresponding 95% confidence interval (CI) showed a statistical association between the TSER polymorphism and breast cancer risk under homozygote comparison (2R/2R vs. non-2R/non-2R; OR 1.25; 95% CI 1.04–1.50), allele contrast (2R vs. non-2R; OR 1.09; 95% CI 1.01–1.19) and the recessive model (OR 1.19; 95% CI 1.01–1.39). In the subgroup analysis by ethnicity, a statistically significant increase in cancer risk was found among Caucasians for homozygote comparison (OR 1.31; 95% CI 1.10–1.57), the allele contrast model (OR 1.12; 95% CI 1.02–1.23) and the dominant model (OR 1.40; 95% CI 1.00–1.95). For the TS3′-UTR polymorphism, significant effects were shown using the allele contrast model (OR 1.33; 95% CI 1.03–1.73). However, the TS3′-UTR polymorphism increased breast cancer risk among Asian women (del6 vs. ins6; OR 1.41; 95% CI 1.01–1.98) but not Caucasian women using the homozygote comparison. In conclusion, our meta-analysis suggests that the TSER polymorphism may increase susceptibility to breast cancer in the Caucasian population and the TS3′-UTR polymorphism may be a genetic determinant for developing breast cancer in the Asian population; therefore, ethnic background should be carefully considered in further studies.

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Acknowledgments

This study was supported by the National Nature Science Foundation of China (30901788) and Shandong Provincial Nature Science Foundation of China (ZR2010HQ038 and ZR2010HM059).

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The authors have no financial or personal relationships to disclose that could inappropriately influence or bias this work.

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Correspondence to Jun Wang.

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Wang, J., Wang, B., Bi, J. et al. The association between two polymorphisms in the TYMS gene and breast cancer risk: a meta-analysis. Breast Cancer Res Treat 128, 203–209 (2011). https://doi.org/10.1007/s10549-010-1314-0

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  • DOI: https://doi.org/10.1007/s10549-010-1314-0

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