title: A population-based study of glutathione S-transferase M1, T1 and P1 genotypes and risk for lung cancer.
abstract: A deletion polymorphism for glutathione S-transferase M1 (GSTM1) has been related to risk for lung cancer among smokers in some studies but not in others. We examined GSTM1, a GSTT1 deletion polymorphism and a common GSTP1 gene variant (iso-->val), as risk factors for lung cancer in a population-based case-control study of men. Cases (N=274) were males identified from 1993 to 1996 through the Fred Hutchinson Cancer Research Center Cancer Surveillance System registry for western Washington State. Male age-matched controls (N=501) were selected by random-digit dialing. Subjects participated in a telephone interview and blood draw. GSTM1 and GSTT1 were genotyped with a multiplex PCR assay using beta-globin as a positive control, and GSTP1 single nucleotide variant determined with PCR-based oligonucleotide ligation assays. GSTM1 absence was associated with a modest elevation in risk among all cases (odds ratio=1.27, 95% CI 0.91-1.77) and among non-small cell cancers (adenocarcinoma OR=1.58, 95% CI 0.99-2.52; squamous cell OR=1.40, 95% CI 0.83-2.34). Risk associated with GSTM1 null was increased two to sixfold among heavy smokers. GSTT1 was not associated with lung cancer risk and GSTP1 val was non-significantly associated with a modest reduction in risk, particularly among heavy smokers. No specific combination of GST genotypes was particularly associated with risk. These results support previous reports that the GSTM1 null genotype is associated with a modest increase in risk for lung cancer, particularly among heavy smokers, suggest no role for GSTT1 and the need for further study of GSTP1.
authors.affiliation: Center for Research on Occupational and Environmental Toxicology, Oregon Health and Science University, Portland, OR 97201, USA.
authors.forename: Valle
authors.initials: V
authors.lastname: Nazar-Stewart
authors.forename: Thomas L
authors.initials: TL
authors.lastname: Vaughan
authors.forename: Patricia
authors.initials: P
authors.lastname: Stapleton
authors.forename: Jason
authors.initials: J
authors.lastname: Van Loo
authors.forename: Berta
authors.initials: B
authors.lastname: Nicol-Blades
authors.forename: David L
authors.initials: DL
authors.lastname: Eaton
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D004273:DNA, Neoplasm; D020022:Genetic Predisposition to Disease; D005838:Genotype; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase / Q000235:genetics*; D006801:Humans; D007527:Isoenzymes / Q000235:genetics*; D008175:Lung Neoplasms / Q000209:etiology* / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012042:Registries / Q000706:statistics & numerical data*; D012307:Risk Factors; D014861:Washington / Q000453:epidemiology
chemical_list: D004273:DNA, Neoplasm; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase; D007527:Isoenzymes; C413545:glutathione S-transferase T1; C496556:GSTP1 protein, human