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Published in: Cancer Causes & Control 5/2006

01-06-2006 | Original Paper

O6-Methylguanine-DNA Methyltransferase Leu84Phe and Ile143Val Polymorphisms and Risk of Colorectal Cancer in the Nurses’ Health Study and Physicians’ Health Study (United States)

Authors: Gregory J. Tranah, James Bugni, Edward Giovannucci, Jing Ma, Charles Fuchs, Lisa Hines, Leona Samson, David J. Hunter

Published in: Cancer Causes & Control | Issue 5/2006

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Abstract

Objective

O6-methylguanine-DNA methyltransferase (MGMT) removes mutagenic adducts from the O6-position of guanine in DNA. Unrepaired O6-methylguanines result in G:C to A:T transitions in mutated K-ras and p53 in colorectal tumors. Two non-synonymous MGMT coding region variants, Leu84Phe and Ile143Val, lie in close proximity to the reactive 145Cys residue and to a conserved estrogen receptor interacting helix.

Methods

We assessed the association between the MGMT Leu84Phe and Ile143Val polymorphisms and risk of colorectal cancer in two nested case–control studies: one each in the Nurses’ Health Study (NHS) and the Physicians’ Health Study (PHS) cohorts.

Results

Among 197 female cases and 2,500 controls from the NHS, the variant 143Val allele was significantly associated with reduced risk of colorectal cancer [odds ratio (OR)=0.52, 95% confidence interval (CI) 0.33–0.80]. In women, statistically significant gene-environment interactions were found between the Leu84Phe polymorphism and alcohol intake (P=0.03), BMI (P=0.04) and postmenopausal hormone use (P=0.03). The Leu84Phe and Ile143Val polymorphisms were not significantly associated with risk of colorectal cancer among 271 male cases and 451 controls from the PHS.

Conclusions

Our results suggest that the common Leu84Phe and Ile143Val polymorphisms in MGMT influence risk of colorectal cancer in women possibly through modulating estrogen receptor-dependent transcriptional activation, which has previously been shown to occur in response to DNA alkylation damage.
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Metadata
Title
O6-Methylguanine-DNA Methyltransferase Leu84Phe and Ile143Val Polymorphisms and Risk of Colorectal Cancer in the Nurses’ Health Study and Physicians’ Health Study (United States)
Authors
Gregory J. Tranah
James Bugni
Edward Giovannucci
Jing Ma
Charles Fuchs
Lisa Hines
Leona Samson
David J. Hunter
Publication date
01-06-2006
Publisher
Kluwer Academic Publishers
Published in
Cancer Causes & Control / Issue 5/2006
Print ISSN: 0957-5243
Electronic ISSN: 1573-7225
DOI
https://doi.org/10.1007/s10552-006-0005-y

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