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The association between glutathione S-transferase M1 (GSTM1) null genotype and risk of oral cancer in East Asians is uncertain owing to the inconclusive results from published studies. In the present study, we performed a meta-analysis of 12 studies from three East Asian countries (China, Japan, and Korea). Those 12 studies consisted of 1,718 cases and 2,236 controls. The pooled odds ratio (OR) and...
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