Glutathione S‐transferase T1 null‐genotype is associated with an increased risk of lung cancer

Glutathione S‐transferases (GSTs) are involved in detoxification of carcinogens, e.g., from tobacco smoke. Therefore, polymorphisms in the GST genes have been considered as potential modifiers of individual cancer risk. In a population‐based case‐cohort study where cases and the subcohort sample were matched on duration of smoking, we investigated the occurrence of lung cancer and histological subtypes of lung cancer in relation to deletion polymorphism in both GSTM1 and GSTT1, single nucleotide polymorphisms (SNPs) in GSTP1 (Ile105Val and Ala114Val) and a 3 base pair deletion polymorphism in GSTM3. We further investigated the effects of the GST polymorphisms on lung cancer risk within subgroups of subjects defined by gender and age. The results showed a 2.4‐fold (CI = 1.31–4.41) increased risk of lung cancer in GSTT1 null‐genotype carriers but no significant effects of the polymorphisms in GSTM1, GSTM3, GSTP1‐105 or GSTP1‐114. The association was strongest in lower age groups, with a 9.6‐fold increase in risk for subjects with the GSTT1 null‐genotype in the 50–55 years age interval (CI = 3.03–30.59). Positive associations were found for GSTT1 within all major histological subtypes. Squamous cell carcinoma was the histological type most strongly associated with the GSTT1 genotype, with a 5.0‐fold (CI = 2.26–11.18) increase in risk for subjects carrying the GSTT1 null‐genotype. The effects of the GSTT1 null‐genotype seemed stronger in the presence of the GSTM1 null‐genotype or the GSTP1‐105 variant allele. These results suggest that the GSTT1 null‐genotype is associated with an increased risk of lung cancer, especially in younger individuals. © 2004 Wiley‐Liss, Inc.

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