Abstract
Background
Accumulated evidence indicates that the incidence of early-onset breast cancer has rapidly increased in Taiwan and other Asian compared to Western countries. The mismatch repair (MMR) pathway might be one of the crucial mechanisms of predisposition to early breast cancer. In this study, we explored whether MMR gene polymorphisms contribute to the risk of breast cancer in young women.
Methods
This was a 2-stage case–control study including 737 cases and 719 controls. After eight single nucleotide polymorphisms (SNPs) were genotyped in MMR pathway genes in the stage I study, a promising SNP, MSH2 rs2303425, was selected for validation in the stage II study. A luciferase reporter assay was used to evaluate the transcriptional activity of MSH2.
Results
Logistic regression analysis showed that individuals with the MSH2 rs2303425 C/C genotype had a significantly increased risk of breast cancer compared to those with the T/T genotype (adjusted odds ratio 2.0; 95 % confidence interval 1.1–3.8), particularly in early-onset breast cancer patients with the luminal A subtype. The luciferase assay in three cell lines indicated that the MSH2 rs2303425 T/C substitution decreased MSH2 expression, which is consistent with the finding of an association study.
Conclusions
A common variant SNP in MSH2 may contribute to the susceptibility to early-onset breast cancer functionally, particularly for the luminal A subtype.
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Acknowledgment
Supported in part by the Health and Welfare Surcharge of Tobacco Products, Ministry of Health and Wealth to the Comprehensive Cancer Center of Taipei Medical University (MOHW104-TDU-B-212-124-001), Ministry of Science and Technology (MOST 103-2314-B-038-017), and Taipei Medical University (TMU102-AE1-B03).
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Hsieh, YC., Cho, EC., Tu, SH. et al. MSH2 rs2303425 Polymorphism is Associated with Early-Onset Breast Cancer in Taiwan. Ann Surg Oncol 24, 603–610 (2017). https://doi.org/10.1245/s10434-016-5168-5
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DOI: https://doi.org/10.1245/s10434-016-5168-5