Journal Article

Associations between carcinogen–DNA damage, glutathione <i>S</i>-transferase genotypes, and risk of lung cancer in the prospective Physicians’ Health Cohort Study

Frederica P. Perera, LaVerne A. Mooney, Meir Stampfer, David H. Phillips, Douglas A. Bell, Andrew Rundle, Stan Cho, Wei-Yann Tsai, Jing Ma, Anne Blackwood and Deliang Tang

in Carcinogenesis

Volume 23, issue 10, pages 1641-1646
Published in print October 2002 | ISSN: 0143-3334
Published online October 2002 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/23.10.1641
Associations between carcinogen–DNA damage, glutathione S-transferase genotypes, and risk of lung cancer in the prospective Physicians’ Health Cohort Study

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DNA damage from polycyclic aromatic hydrocarbons (PAH) and other aromatic/hydrophobic compounds has been implicated in case–control studies as a risk factor for lung cancer, as have common polymorphisms in the glutathione S-transferase (GST) genes involved in carcinogen detoxification. However, their joint effects have not been evaluated in prospective studies, leaving open questions about predictive value of these biomarkers. In this matched case–control study nested within the prospective Physicians’ Health Study, we evaluated whether biomarkers measured in white blood cells (WBC) significantly predicted risk, alone and in combination, after controlling for level of smoking. The biomarkers reported here are aromatic/hydrophobic–DNA adducts and polymorphisms in genes coding for the GSTM1 and GSTP1 enzymes. Our study population was composed of 89 cases of primary lung cancer and 173 controls, matched in a 1:2 ratio on smoking, age and duration of follow up. Adducts were measured in WBC DNA by the nuclease P1-enhanced 32P-post-labeling method. Genotypes (GSTM1 null versus non-null and GSTP1 Val versus GSTP1 Ile) were determined by genomic amplification and restriction fragment length polymorphism analysis. Among current smokers, adducts were significant predictors of lung cancer risk (after adjusting for GST genotypes, OR = 3.10, 95% CI 1.07, 9.01). The combined GSTM1 null/GSTP1 Val genotype was associated with lung cancer overall and especially among former smokers, before and after adjusting for adducts (OR for former smokers = 4.21, CI 1.08, 16.41; adjusted OR = 4.68, CI 1.17, 18.71). Among cases only, adducts were significantly higher among current or former smokers with the GSTM1 non-null/GSTP1 Ile genotype. The two risk factors (adducts and genotypes) appear to be independent predictors of risk. The findings underscore the complex and important role of biological susceptibility as a determinant of risk from carcinogens found in tobacco smoke and other environmental compounds.

Keywords: BPDE, B[a]P-diolepoxide; DRZ, diagonal radiation zone; GST, glutathione S-transferase; Ile, isoleucine; NNK, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone; NSCLC, non small cell lung carcinoma; PAH, polycyclic aromatic hydrocarbons; PCR, polymerase chain reaction; PHS, Physicians’ Health Study; RFLP, restriction fragment length polymorphism; SCLC, small cell lung carcinoma; Val, valine; WBC, white blood cells

Journal Article.  5839 words. 

Subjects: Clinical Cytogenetics and Molecular Genetics

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