Cancer Epidemiology Biomarkers & Prevention, Vol 7, Issue 1 19-23, Copyright © 1998 by American Association for Cancer Research

ARTICLES

Larynx cancer risk in relation to glutathione S-transferase M1 and T1 genotypes and tobacco smoking

N Jourenkova, M Reinikainen, C Bouchardy, P Dayer, S Benhamou and A Hirvonen
Unit of Cancer Epidemiology (INSERM U351), Institut Gustave-Roussy, Villejuif, France.

Glutathione S-transferase (GST) isoenzymes are involved in the detoxification of several tobacco smoke-derived carcinogens. It is thus conceivable that deficiency in GST activity due to homozygous deletion of the GSTM1 and GSTT1 genes (the null genotypes) may modulate susceptibility to smoking-induced cancers. The effects of the GSTM1 and GSTT1 null genotypes on laryngeal cancer risk were evaluated using peripheral blood DNA from 129 larynx cancer patients and 172 noncancer controls, all of whom were regular smokers. Increased larynx cancer risk was related to the GSTM1 null genotype [odds ratio (OR) = 1.6, 95% confidence interval (CI) = 1.0-2.8]. The OR associated with the GSTT1 null genotype was increased, although not significantly (OR = 1.4, 95% CI = 0.7-2.9). Individuals with concurrent lack of GSTM1 and GSTT1 genes had a doubled, although not significant, risk for larynx cancer when compared with those having at least one of these genes (OR = 2.0, 95% CI = 0.8-5.2) and had almost a 3-fold risk (OR = 2.7, 95% CI = 1.0-7.4) when compared with those with both genes. Moreover, a significant interaction between the GSTM1 genotype and levels of tobacco consumption (P < 0.05) was found; the GSTM1 null genotype was associated with an increased risk of larynx cancer among smokers of 20 g/day or less (OR = 2.9, 95% CI = 1.3-6.3) but not among heavier smokers (OR = 1.0; 95% CI = 0.5-2.0). In contrast, the GSTT1 null genotype posed an increased, although not significant, risk among long-term smokers (OR = 2.3, 95% CI = 0.9-5.4).

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