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GLCE rs3865014 (Val597Ile) polymorphism is associated with breast cancer susceptibility and triple-negative breast cancer in Siberian population.
Gene 2017 September 11
d-Glucuronyl C5-epimerase (GLCE) is one of key enzymes in heparan sulfate biosynthesis and possesses tumour-suppressor function in breast carcinogenesis. Here, we investigated a potential involvement of GLCE polymorphism(s) in breast cancer development in Siberian women population. Comprehensive analysis of SNP databases revealed GLCE rs3865014 (Val597Ile) missense polymorphism as the main significantly present in human populations. According the TaqMan-based SNP assay, allele distributions for the rs3865014 (A>G) were similar in healthy Siberian women (n=136) and cancer patients (n=129) (A0,73:G0,27) and intermediate between the European and Asian populations, while genotype distributions were different, with the increase of AG rate in breast cancer patients (OR=1.76; 95% CI=1.04-1.90; P(Y)=0.035 χ(2)=4.44). Heterozygous AG genotype was associated with tumour size (OR=3.67, P(Y)=0.004), ER-negative tumours (OR=3.25, P(Y)=0.0028), triple-negative tumours (OR=4.94, P(Y)=0.015) but not menopausal status, PR and HER-2 status, local or distant metastasis. Homozygous GLCE genotypes (AA/GG) were more common for ER+PR+ luminal A breast cancer (OR=0.25, P(Y)=0.031). Loss-of-heterozigosity was identified in 5 of 51 breast tumours and the loss of G allele was associated with the decreased GLCE expression. Epidemiologic data for the GLCE SNP in different racial/ethnic groups demonstrated high AG genotype rates as a risk factor not for breast cancer incidence but for poor prognosis of the disease. The obtained data suggest an involvement of GLCE rs3865014 in breast cancer development. Heterozygous AG genotype might be a risk factor for breast cancer susceptibility in Siberian women and is associated with aggressive ER-negative and triple-negative cancer subtypes.
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