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- W1970999387 abstract "Although a number of studies have been conducted to address the relation between a gene deletion polymorphism of glutathione S-transferase M1 (GSTM1) and breast cancer, no definite conclusion has been reached and no clear risk pattern has yet to emerge for GSTM1. We first conducted case-control studies that included 1920 subjects using a genotyping method allowing the definition of GSTM1-null (-/-), homozygous wild-type (+/+), and heterozygous (+/-) genotypes. The results show that GSTM1(-/-) confers an increased risk for breast cancer development compared with that in GSTM1-present individuals (+/+ and +/-), which was subsequently confirmed by a meta-analysis of all of the 41 relevant studies (odds ratio: 1.10, P<0.001). Unexpectedly, we found that GSTM1(+/+) is also a risk genotype compared with GSTM1(+/-). Furthermore, we identified a functional polymorphism in the GSTM1 promoter region associated with breast cancer. The variant allele modifies DNA binding to the AP-2alpha transcription factor, resulting in reduced promoter activity and mRNA expression. However, this low-activity allele is associated with reduced breast cancer risk. It seems that approximately 60-70% expression from one allele of GSTM1 could suffice for protection against breast cancer; null activity and overactivity of GSTM1 are both disadvantageous. These results indicate a U-shaped association of GSTM1 with breast cancer, which challenges the linear gene-dosage effect of GSTM1 that was previously proposed. We recommend that a more complicated role for GSTM1 should be considered in breast cancer risk prediction." @default.
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- W1970999387 date "2009-02-19" @default.
- W1970999387 modified "2023-10-16" @default.
- W1970999387 title "A functional polymorphism in the promoter region of<i>GSTM1</i>implies a complex role for<i>GSTM1</i>in breast cancer" @default.
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- W1970999387 doi "https://doi.org/10.1096/fj.08-124073" @default.
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