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Objective: To investigate associations between potentially functional tagSNP in the DNMT3A promoter region and susceptibility to gastric cancer risk inJiangsu population.Methods: We employed a haplotype-based tagging SNPs(tagSNPs) approach (http://gvs.gs.washington.edu/GVS/and http://snpifo.ninehs.nih.gov/) and Haploview software from the HapMap and dbSNP database for the Chinese to identify tagSNP (25566340 T > C) in the promoter region of DNMT3A.The transcription factor binding region at 25566340 T > C was analyzed using an online search program (http://mbs.cbrc.