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Associations of null polymorphism (copy number variation) of detoxification genes GSTM1, GSTT1 and GSTP1 (at rs2495636, 105 Ile/Val) with the breast cancer (BC) were assessed in two main ethnic groups of the Republic of Kazakhstan (Kazakhs and Russians). Total number of patients was 181, and of controls 397. Statistically significant difference was observed between BC patients and healthy individuals in alleles frequency (χ2 = 4.89, р = 0.007) of GSTP1 gene at rs2495636 (105 Ile/Val) among the Kazakhs ethnic group. Difference in genotypes distribution (χ2 =5.26, р = 0.076) at this site is approximating to be statistically significant. In the Russian group, no differences were found in genotypes and alleles atrs 2495636 of GSTP1 gene between cases and controls. There was no significant difference between null polymorphism (copy number variation) of GSTM1 and GSTT1 genes among cases and controls in both ethnic groups.

advances in breast cancer research

Polymorphisms at &amp;lt;i&amp;gt; GSTM &amp;lt;/i&amp;gt;1, &amp;lt;i&amp;gt; GSTP &amp;lt;/i&amp;gt;1, &amp;lt;i&amp;gt; GSTT &amp;lt;/i&amp;gt;1 Detoxification Genes Loci and Risk of Breast Cancer in Kazakhstan Population