Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/113333
Title: A new single nucleotide polymorphism in the insulin-like growth factor I regulatory region associates with colorectal cancer risk in Singapore Chinese
Authors: Wong, H.-L.
DeLellis, K.
Probst-Hensch, N.
Koh, W.-P. 
Van Den Berg, D.
Lee, H.-P.
Yu, M.C.
Ingles, S.A.
Issue Date: Jan-2005
Source: Wong, H.-L.,DeLellis, K.,Probst-Hensch, N.,Koh, W.-P.,Van Den Berg, D.,Lee, H.-P.,Yu, M.C.,Ingles, S.A. (2005-01). A new single nucleotide polymorphism in the insulin-like growth factor I regulatory region associates with colorectal cancer risk in Singapore Chinese. Cancer Epidemiology Biomarkers and Prevention 14 (1) : 144-151. ScholarBank@NUS Repository.
Abstract: Elevated levels of plasma insulin-like growth factor I (IGF-I) are a potential risk factor for several cancers, including colorectal cancer. Physiologic levels of plasma IGF-I vary greatly; this variation may be in part genetically determined. We identified two single nucleotide polymorphisms (SNP) in perfect linkage disequilibrium with each other and in partial linkage disequilibrium with a previously studied cytosine-adenine microsatellite [-969(CA)n]. We investigated one of the SNPs, -533T/C, and the 969(CA)n in relation to the risk of colorectal cancer in a case-control study nested within a cohort of Singapore Chinese (cases/controls = 290:873). The (CA)21 allele, rather than the previously implicated (CA)19 allele, was associated with a reduced risk of colorectal cancer (odds ratio for 21/21 versus all other genotypes, 0.48; 95% confidence interval, 0.28-0.84). For the -533C/T SNP, persons carrying one or more copies of the C allele had a decreased in risk of colorectal cancer compared with noncarriers (odds ratio for CC/CT versus TT, 0.58; 95% confidence interval, 0.41-0.82). This association was specific for colon, as opposed to rectal cancer and was modified by age. We also examined a functional insulin-like growth factor binding protein (IGFBP3) promoter SNP, -202 A/C, previously reported to predict serum IGFBP3 levels. Although we were able to confirm this genotype-phenotype association, the -202A/C IGFBP3 SNP was not significantly associated with colorectal cancer risk. In conclusion, we report a novel SNP in the IGF-I regulatory region that is associated with colorectal cancer risk.
Source Title: Cancer Epidemiology Biomarkers and Prevention
URI: http://scholarbank.nus.edu.sg/handle/10635/113333
ISSN: 10559965
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