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BMC Proceedings

Open Access

Polymorphisms of GSTM1, GSTT1, GSTP1 and CYP1A1 genes and susceptibility to lung cancer

BMC Proceedings20104(Suppl 2):P4

Published: 24 September 2010


Lung CancerHydrocarbonGene CopyGenotype DistributionGene Copy Number

Biotransformation enzymes are related with lung cancer that arises as a consequence of exposure to mutagenic agents. CYP1A1 gene codifies the phase I enzyme, aryl hydrocarbon hydroxilase, belonging to the Cytochrome P450 system, that plays a major role in the bioactivation of tobacco procarcinogenes, while glutathione-S-transferases genes, GSTM1, GSTT1 and GSTP1, codify conjugation enzymes associated with detoxification processes of free radicals, xenobiotics and cytotoxic drugs [1]. Our main goal was to verify possible associations between polymorphisms of these genes and susceptibility to lung cancer.

CYP1A1 polymorphisms, m1 (T6235C) and m2 (A4889G) were studied by RFLP assay, GSTM1 and GSTT1 (GSTM1*0 and GSTT1*0) by PCR multiplex and GSTP1 (rs1695) by real time PCR, in 197 patients and 237 controls. For CYP1A1 alleles and genotype distributions, no statistically significant differences were found between both populations. GSTT1 *0/*0 genotype was associated with a higher susceptibility to lung cancer (OR: 1.6; 95%CI: 1.02-2.44; p < 0.05). In the patient population, smoking burden of 21-100 pack-years were more frequently associated with GSTT1 *0/*0 genotype than in controls (p < 0.02). This difference was even more significant for ex-smokers (p < 0.001). Gene copy number assay exposed an association between GSTM1*1/*0and lung cancer (p < 0.001).

The results reveal a possible association between GSTT1 *0/*0and susceptibility to lung cancer related with smoking habbits.

Authors’ Affiliations

Unidade de Genética Médica, Faculdade de Medicina, Universidade de Coimbra, Coimbra, Portugal
Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, Coimbra, Portugal
Centro de Pneumologia, Faculdade de Medicina, Universidade de Coimbra, Coimbra, Portugal


  1. Taioli E: Gene-environment interaction in tobacco-related cancer. Carcinogenesis. 2008, 29: 1467-1474. 10.1093/carcin/bgn062.PubMed CentralView ArticlePubMedGoogle Scholar


© Mota et al; licensee BioMed Central Ltd. 2010

This article is published under license to BioMed Central Ltd.