© 1996 Oxford University Press
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Glutathione S-transferase M1 (GSTM1) and T1 (GSTT1) genetic polymorphism and susceptibility to gastric and colorectal adenocarcinoma
1National Institute of Environmental Health Sciences PO Box 12233, Research Triangle Park, North Carolina, 27709, USA
2Branch of Public Health, School of Medical Technology, University of Occupational and Environmental Health Kitakyushu, Japan
3Department of First Surgery, School of Medicine, University of Occupational and Environmental Health Kitakyushu, Japan
4Department of Surgery, Mitsubishi Kagaku Hospital Kitakyushu, Japan
5To whom correspondence should be addressed
Genes coding for the glutatione S-transferase M1 (GSTM1) and Theta 1 (GSTT1) proteins are polymorphic in humans and these genes are absent, or homozygous null, in 1060% of different ethnic populations. These enzymes catalyze the conjugation of glutathione to numerous carcinogenic chemicals and previous epidemiologic studies have associated the null genotypes of these GST genes with higher risk of cancer. In this study the frequency of GSTM1 and GSTT1 null genotypes was determined in Japanese patients with gastric adenocarcinoma and colorectal adenocarcinoma and compared to frequencies determined in a community-based control group. The frequency of the null GSTM1 genotype in patients with gastric adenocarcinoma (56.8%) showed a statistically significant increase compared to the control group frequency (43.6%) (odds ratio (OR) = 1.70; 95% CI, 1.052.76). The frequency of GSTM1 null individuals was also higher among all colorectal adenocarcinoma cases, but this increase did not reach statistical significance. After grouping by tumor site, the GSTM1 null genotype was a risk factor among the subgroup with distal colorectal tumors (61.1%) (OR = 2.03; 95% CI, 1.063.90). No consistent difference was observed between smoking patients and corresponding controls for the frequency of the GSTM1 null genotype for either cancer, although a large risk (OR = 5.76; 95% CI 1.1828.3) was associated with the GSTM1 null genotype in the low smoking group of gastric adenocarcinoma patients. On the other hand, no statistically significant differences were observed in the frequency of null GSTT1 genotypes in gastric (47.5%) or colorectal (48.5%) adenocarcinoma patients when compared with the control population (44.4%). These results suggest that the GSTM1 null genotype may be associated with susceptibility to gastric adenocarcinoma and distal colorectal adenocarcinoma in Japanese; however, the associations observed were relatively weak and additional studies will be needed to confirm these findings.
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