Glutathione S-transferase and cytochrome-P-450 polymorphism as risk factors for squamous cell carcinoma of the larynx
Abstract
While cigarette smoking and alcohol consumption are recognized covariates for laryngeal carcinoma, the role of genetic factors in determining individual susceptibility is unknown. We describe the influence of polymorphism in carcinogen-metabolizing enzymes on susceptibility to squamous cell carcinoma of the larynx. We investigated 269 patients with T1-T4 laryngeal carcinoma and 216 controls. Enzyme genotypes at the glutathione-S-transferase GSTM1 (A, B, A/B, null), GSTM3 (A, B), GSTT1 (null and expressors), and cytochrome P-450, CYP2D6 (intron 3/exon 4 boundary mutation and exon 5 deletion), CYP1A1 (3'-mutation and exon 7 mutation), and CYP2E1 (mutation at the 5' flanking region) loci were determined using polymerase chain reaction and restriction-based approaches. While the frequencies of the heterozygote GSTM1 A/B and homocygote GSTM3 B/ B were statistically significantly lower in cases than controls, the frequency of the GSTT1 null genotype was higher in the cases than controls. Genotype frequencies of 123 patients suffering squamous cell carcinomas located at different sites within the upper aerodigestive tract showed no differences between cases and controls. The data provide evidence that susceptibility to laryngeal carci...Continue Reading
References
Genetic polymorphism of cytochromes P450 1A1, 2D6 and 2E1: regulation and toxicological significance
Citations
Epidemiology of carcinogen metabolism genes and risk of squamous cell carcinoma of the head and neck
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