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Variation in TCF7L2 and increased risk of colon cancer: the Atherosclerosis Risk in Communities (ARIC) Study.

TitleVariation in TCF7L2 and increased risk of colon cancer: the Atherosclerosis Risk in Communities (ARIC) Study.
Publication TypeJournal Article
Year of Publication2008
AuthorsFolsom AR, Pankow JS, Peacock JM, Bielinski SJ, Heiss G, Boerwinkle E
JournalDiabetes Care
Volume31
Issue5
Pagination905-9
Date Published2008 May
ISSN1935-5548
KeywordsAfrican Continental Ancestry Group, Atherosclerosis, Colonic Neoplasms, European Continental Ancestry Group, Female, Genetic Variation, Genotype, Humans, Male, Middle Aged, Polymorphism, Single Nucleotide, Registries, Risk Factors, TCF Transcription Factors, Transcription Factor 7-Like 2 Protein
Abstract

OBJECTIVE: The purpose of this study was to determine whether a variation in the transcription factor 7-like 2 (TCF7L2) gene, which influences diabetes risk, is associated with incidence of cancers.

RESEARCH DESIGN AND METHODS: We related diabetes and TCF7L2 variation with occurrence of several common cancers in a prospective cohort study of 13,117 middle-aged adults initially free of cancer in 1987-1989. We assessed five single nucleotide polymorphisms (SNPs) in TCF7L2 including the putative SNP (rs7903146) for diabetes. We identified incident cancers through 2000 via cancer registries, supplemented by hospital records.

RESULTS: Diabetes was associated marginally inversely with incidence of prostate cancer but not with incidence of colorectal, colon, lung, or breast cancer. The T allele of rs7903146 (frequency 30%) was associated with increased risk of colorectal cancer and, more specifically, colon cancer, with adjusted hazard ratios (95% CI) of 1.0 for CC, 1.25 (0.85-1.83) for CT, and 2.15 (1.27-3.64) for TT genotypes (P(trend) = 0.009). TCF7L2 variation also was associated with lung cancer incidence in whites but not blacks, but residual confounding by smoking may be present.

CONCLUSIONS: Subjects who were initially cancer-free and carrying certain genetic variants of TCF7L2, most notably the T allele of rs7903146, have an increased risk of colon cancer. This association appears to be an independent gene effect not explained by diabetes. Because the T allele of rs7903146 is common, if a causal link is established, this variant could account for a sizable proportion ( approximately 17% here) of cases of colon cancer in the general population.

DOI10.2337/dc07-2131
Alternate JournalDiabetes Care
PubMed ID18268068
PubMed Central IDPMC2577771
Grant ListN01-HC-55022 / HC / NHLBI NIH HHS / United States
N01-HC-55016 / HC / NHLBI NIH HHS / United States
N01-HC-55021 / HC / NHLBI NIH HHS / United States
N01 HC055019 / HC / NHLBI NIH HHS / United States
N01-HC-55019 / HC / NHLBI NIH HHS / United States
N01-HC-55015 / HC / NHLBI NIH HHS / United States
N01-HC-55020 / HC / NHLBI NIH HHS / United States
N01-HC-55018 / HC / NHLBI NIH HHS / United States
R03-CA65473 / CA / NCI NIH HHS / United States
N01HC55015 / HL / NHLBI NIH HHS / United States