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Colorectal cancer (CRC) is one of the most common cancers worldwide. DNA mismatch repair (MMR) is an evolutionarily conserved process that corrects mismatches generated during DNA replication. MMR defects were found to be associated with hereditary non-polyposis colorectal cancer (HNPCC) and a subset of sporadic colon cancers. The inheritance of common variations in MMR genes may influences individual susceptibility to the development of colorectal cancer. The purpose of the study was to evaluate the association between gene polymorphisms Glu39Gly (c.116G &gt; A) of MSH6 gene and IVS1-1121C &gt; T of PMS2 gene and sporadic colorectal cancer risk, in a case-control study comprising 200 patients and 200 controls origination from polish population. DNA was isolated from peripheral blood lymphocytes of enrolled patients, and gene polymorphisms were analysed by restriction fragment length polymorphism-polymerase chain reaction (RFLP-PCR) for MSH6 and TaqMan for PMS2. G/A variant of Glu39Gly (c.116G &gt; A) genotype was associated with an increased risk of colorectal cancer (OR 1,65 95%CI:1,01-2,69 p = 0.44). Presence of A allele was also significantly higher in patient with CRC (OR 1,57 95% CI: 1,04-2,38 p = 0.032). Prevalence of this genotype was also markedly higher in females and patients above 60 years in CRC group (OR 2.25 95%CI: 1.22-4.14 p = 0.0098 and OR 2.74 95% CI: 1.27-5.93 p = 0.0097 respectively). None of such correlations was observed for genotype variants of IVS1-1121C &gt; T PMS2. In conclusion, our data suggests thatMSH6 Glu39Gly polymorphism is associated with the risk of developing sporadic colorectal cancer in polish population. Linkage to the female gender, onset above 60 years old and further increase of risk when combined with wild-type allele of PMS2 IVS1-1121C &gt; T polymorphism indicates defective mismatch repair system.

pathology and oncology research/pathology oncology research

The 116G &gt; A MSH6 and IVS1-1121C &gt; T PMS2 Genes Polymorphisms Modulate the Risk of the Sporadic Colorectal Cancer Development in Polish Population