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Objective Functional inactivation of MMR genes,such as human mutL homolog 1(hMLH1),by promoter methylation is responsible for the MSI-high(MSI-H)phenotype in gastric cancer.MLH1 gene methylation have been shown to play pivotal roles in gastric cancer pathogenesis,the significance of this event on clinicopathological feathures and survival outcomes in patients with gastric cancer remains unknown.