PuSH - Publication Server of Helmholtz Zentrum München: Exon 5 polymorphisms in the O6-alkylguanine DNA alkyltransferase gene and lung cancer risk in non-smokers exposed to second-hand smoke.

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Cohet, C.* ; Borel, S.* ; Nyberg, F.* ; Mukeria, A.* ; Brüske, I. ; Constantinescu, V.* ; Benhamou, S.* ; Brennan, P.* ; Hall, J.* ; Boffetta, P.*

Exon 5 polymorphisms in the O6-alkylguanine DNA alkyltransferase gene and lung cancer risk in non-smokers exposed to second-hand smoke.

Cancer Epidemiol. Biomarkers Prev. 13, 320-323 (2004)

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Open Access Green as soon as Postprint is submitted to ZB.

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Purpose: The objective of the study was to examine the association of three exon 5 variants in the O⁶-alkylguanine DNA alkyltransferase (AGT) gene involved in the repair of the mutagenic DNA lesion O⁶-alkylguanine formed by nitrosamines, with lung cancer risk in never-smokers. Experimental Design: Exon 5 of the AGT gene was sequenced in genomic DNA from 136 cases and 133 hospital- or population-based controls for whom questionnaire information on second-hand smoke and diet was available to determine the frequencies of the Gly¹⁶⁰Arg, Ile¹⁴³Val, and Lys¹⁷⁸Arg variant alleles. Results: No codon ¹⁶⁰Arg variant alleles were found in the study population. The codon ¹⁴³Val and ¹⁷⁸Arg variant alleles, present at allele frequencies of 0.07, showed 100% linkage. The odds ratio (OR) of lung cancer for these variant carriers was 2.05 [95% confidence interval (CI) 1.03–4.07]. The risk varied between the different lung cancer pathologies with an increased risk for adenocarcinoma (OR 2.67, 95% CI 1.21–5.87) or small cell carcinoma (OR 4.83, 95% CI 0.91–25.7) but not for squamous cell carcinoma (OR 1.07, 95% CI 0.27–4.18). Compared with individuals carrying the mutant alleles unexposed to second-hand smoke, the OR for exposed variant carriers was 1.95 (95% CI 0.53–1.15); a similar interaction, although not significative, was observed for low consumption of cruciferous vegetables and for green vegetables and tomatoes. Conclusions: These results point toward a role of AGT polymorphisms in lung cancer susceptibility among never-smokers, in particular among subjects exposed to environmental carcinogens.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

ISSN (print) / ISBN 1055-9965

e-ISSN 1538-7755

Journal Cancer Epidemiology, Biomarkers & Prevention

Quellenangaben Volume: 13, Pages: 320-323

Publisher American Association for Cancer Research (AACR)

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Epidemiology (EPI)