Metabolic Polymoryphisms, Smoking, and Oral Cancer in Puerto Rico
Genetic polymorphisms resulting in variation in metabolism of tobacco carcinogens may influence oral cancer risk. In a population-based case–control study in Puerto Rico, genotypes of CYP1A1, GSTM1, and GSTT1 were determined by a PCR-based method for 132 oral cancer patients and 143 control subjects. Genotype-associated risks were estimated by logistic regression. The null variant of GSTM1 was associated with a marginally significant decrease in oral cancer risk [odds ratio (OR) = 0.6, 95% confidence interval (CI) = 0.3–1.0, and P for trend = 0.09]. Risks increased with increasing cigarette use among subjects with the GSTM1-present genotype (P for trend <0.0001), rising to OR = 9.5, 95% CI = 3.0–30, among the heaviest cigarette users. In contrast, among subjects with the GSTM1-null genotype, risks did not clearly increase with increasing cigarette use (P for trend <0.61; OR = 1.8, 95% CI = 0.6–5.2 among the heaviest tobacco users). The GSTT1-null variant (OR = 1.0, 95% CI = 0.5–1.9) and CYP1A1462Val variant (OR = 0.9, 95% CI = 0.5–1.7) were not associated with the risk. Risks rose with increasing cigarette use in a similar manner for subjects with or without the CYP1A1462Val variant (P for interaction = 0.3) and for subjects with or without the GSTT1-null genotype (P for interaction = 0.4). In conclusion, cigarette use significantly increased the risk of oral cancer in this population. The GSTM1-present genotype was associated with higher tobacco-associated risk for oral cancer among heavy smokers than the null genotype.
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Document Type: Research Article
*Division of Cancer Treatment and Diagnosis, National Cancer Institute, Bethesda, MD 20892
†Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD 20892
¶Lombardi Cancer Center, Georgetown University Medical Center, Washington, DC 20007
‡Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD 20892
#School of Dentistry, University of Puerto Rico, San Juan, PR 00936-5067
**Center for Pharmacogenomics and Complex Disease Research, New Jersey Dental School, UMDNJ, Newark, NJ 07101-1709
§Laboratory of Human Carcinogenesis, National Cancer Institute, Bethesda, MD 20892
Publication date: 01 January 2003
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