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Genetic polymorphisms of GSTO2, GSTM1, and GSTT1 and risk of gastric cancer

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Abstract

Objective The glutathione S-transferases (GSTs) are a superfamily of proteins that participates in detoxification. The GSTs were dividing into several classes including omega (GSTO), mu (GSTM) and theta (GSTT) classes. In human GSTO2, GSTM1, and GSTT1 are polymorphic. In order to study whether GSTO2, GSTM1, and GSTT1 polymorphisms are associated with increased gastric cancer risk in Iranian patients, the present case–control study was done. Methods Genomic DNA was extracted from peripheral blood of 67 gastric cancer patients and 134 control subjects. The genotyping was performed using PCR-based method. The possible association of gastric cancer with the GSTO2 N142D polymorphism was estimated with assuming additive, dominant, and recessive effect of the variant 142D allele. To investigate whether profiles of GST genotypes are associated with the risk of gastric cancer, we used unconditional logistic regression analysis. Results The GSTO2 142D allele in additive, dominant and recessive models was not associated with the risk. Because GSTM1, GSTT1, and GSTO2 genes belong to low-penetrance genes which might be involved in the carcinogenesis, patients and controls without family of cancer in first-degree relatives were also analyzes separately. To investigate whether profiles of GST genotypes are associated with the risk of gastric cancer, we used unconditional logistic regression analysis with GSTM1, GSTT1, and GSTO2 genotypes as predictor factors. The GSTO2 DD genotype was associated with decreased risk as compared to GSTO2 NN genotype (OR = 0.21, 95% CI: 0.05–0.92, P = 0.038). Conclusions Present findings show that GSTO2 DD genotype decreases the risk of gastric cancer in individuals without history of cancer in their first-degree relatives.

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Acknowledgments

The authors are indebted to the participants for their close cooperation. The authors are indebted to Dr. Maryam Ansari-Lari for critical reading of the manuscript and for her contribution in discussion. This study was supported by Shiraz University.

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Authors and Affiliations

  1. Department of Biology, College of Sciences, Shiraz University, Shiraz, 71454, Iran

    Mohammad Masoudi, Iraj Saadat & Mostafa Saadat

  2. Institute of Biotechnology, Shiraz University, Shiraz, Iran

    Iraj Saadat & Mostafa Saadat

  3. Department of Chemotherapy, Shiraz University of Medical Sciences, Shiraz, Iran

    Shahpour Omidvari

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  1. Mohammad Masoudi
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  2. Iraj Saadat
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  3. Shahpour Omidvari
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  4. Mostafa Saadat
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Correspondence to Mostafa Saadat.

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Masoudi, M., Saadat, I., Omidvari, S. et al. Genetic polymorphisms of GSTO2, GSTM1, and GSTT1 and risk of gastric cancer. Mol Biol Rep 36, 781–784 (2009). https://doi.org/10.1007/s11033-008-9245-0

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  • DOI: https://doi.org/10.1007/s11033-008-9245-0

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