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MTHFR polymorphisms and H. pylori infection in GC patients and in GC-first grade relatives. a The table indicates the number of persons (columns 2 and 4) with a confirmed histological HP infection in association with the 677 and 1298 genotypes. b The graphic evidences the similar HP infection frequency in GC and in GC-relatives series. No preferential HP distribution was found among the 677 genotypes
