BACKGROUND: Selenium manifests its biological effects through its incorporation into selenoproteins, which play several roles in countering oxidative and inflammatory responses implicated in colorectal carcinogenesis. Selenoprotein genetic variants may contribute to colorectal cancer (CRC) development, as we previously observed for SNP variants in a large European prospective study and a Czech case-control cohort. METHODS: We tested if significantly associated selenoprotein gene SNPs from these studies were also associated with CRC risk in case-control studies from Ireland (colorectal neoplasia, i.e., cancer and adenoma cases: 450, controls: 461) and the Czech Republic (CRC cases: 718, controls: 646). Genotyping of 23 SNPs (20 in the Irish and 13 in the Czechs) was performed by competitive specific allele-specific PCR (KASPar). Multivariable adjusted logistic regression was used to assess the associations with CRC development. RESULTS: We found significant associations with an increased CRC risk for rs5859 (SELENOF) and rs2972994 (SELENOP) in the Irish cohort but only with rs4802034 (SELENOV) in the Czechs. Significant associations were observed for rs5859 (SELENOF), rs4659382 (SELENON), rs2972994 (SELENOP), rs34713741 (SELENOS), and the related Se metabolism gene variant rs2275129 (SEPHS1) with advanced colorectal neoplasia development. However, none of these findings retained significance after multiple testing corrections. CONCLUSIONS: Several SNPs previously associated with CRC risk were also associated with CRC or colorectal neoplasia development in either the Irish or Czech cohorts. Selenoprotein gene variation may modify CRC risk across diverse European populations, although the specific variants may differ.

Biomedical Centre Faculty of Medicine in Pilsen Charles University 323 00 Pilsen Czech Republic

Cancer Biology and Therapeutics Group School of Biomolecular and Biomedical Science UCD Conway Institute University College Dublin D04 V1W8 Dublin Ireland

Centre for Colorectal Disease St Vincent's University Hospital D04 T6F4 Dublin Ireland

Department of Surgery 1st Faculty of Medicine Charles University and Thomayer Hospital 121 08 Prague Czech Republic

Institute of Biology and Medical Genetics 1st Faculty of Medicine Charles University 121 08 Prague Czech Republic

Institute of Experimental Medicine ASCR 142 20 Prague Czech Republic

Trinity Translational Medicine Institute Department of Surgery Trinity College Dublin and St James's Hospital D08 NHY1 Dublin Ireland

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