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One-carbon metabolism biomarkers and genetic variants in relation to colorectal cancer risk by KRAS and BRAF mutation status
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.
Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience.
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2018 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 4, article id e0196233Article in journal (Refereed) Published
Abstract [en]

Disturbances in one-carbon metabolism, intracellular reactions involved in nucleotide synthesis and methylation, likely increase the risk of colorectal cancer (CRC). However, results have been inconsistent. To explore whether this inconsistency could be explained by intertumoral heterogeneity, we evaluated a comprehensive panel of one-carbon metabolism biomarkers and some single nucleotide polymorphisms (SNPs) in relation to the risk of molecular subtypes of CRC defined by mutations in the KRAS and BRAF oncogenes. This nested case-control study included 488 CRC cases and 947 matched controls from two population-based cohorts in the Northern Sweden Health and Disease Study. We analyzed 14 biomarkers and 17 SNPs in prediagnostic blood and determined KRAS and BRAF mutation status in tumor tissue. In a multivariate network analysis, no variable displayed a strong association with the risk of specific CRC subtypes. A non-synonymous SNP in the CTH gene, rs1021737, had a stronger association compared with other variables. In subsequent univariate analyses, participants with variant rs1021737 genotype had a decreased risk of KRAS-mutated CRC (OR per allele = 0.72, 95% CI = 0.50, 1.05), and an increased risk of BRAF-mutated CRC (OR per allele = 1.56, 95% CI = 1.07, 2.30), with weak evidence for heterogeneity (Pheterogeneity = 0.01). This subtype-specific SNP association was not replicated in a case-case analysis of 533 CRC cases from The Cancer Genome Atlas (P = 0.85). In conclusion, we found no support for clear subtype-specific roles of one-carbon metabolism biomarkers and SNPs in CRC development, making differences in CRC molecular subtype distributions an unlikely explanation for the varying results on the role of one-carbon metabolism in CRC development across previous studies. Further investigation of the CTH gene in colorectal carcinogenesis with regards to KRAS and BRAF mutations or other molecular characteristics of the tumor may be warranted.

Place, publisher, year, edition, pages
Public Library of Science , 2018. Vol. 13, no 4, article id e0196233
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Cancer and Oncology
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URN: urn:nbn:se:umu:diva-147822DOI: 10.1371/journal.pone.0196233ISI: 000430802400077PubMedID: 29694444OAI: oai:DiVA.org:umu-147822DiVA, id: diva2:1208966
Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-06-09Bibliographically approved

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Myte, RobinGylling, BjörnHäggström, JennySchneede, JörnLöfgren-Burström, AnnaHallmans, GöranJohansson, IngegerdPalmqvist, RichardVan Guelpen, Bethany

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Myte, RobinGylling, BjörnHäggström, JennySchneede, JörnLöfgren-Burström, AnnaHallmans, GöranJohansson, IngegerdPalmqvist, RichardVan Guelpen, Bethany
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OncologyPathologyStatisticsDepartment of Pharmacology and Clinical NeuroscienceDepartment of Biobank ResearchDepartment of Public Health and Clinical MedicineDepartment of Odontology
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