The allele frequency of DQA1*0102 was significantly lower in the H. pylori (+) atrophic gastritis group than in the H. pylori (+) superficial gastritis and H. pylori (-) normal control groups.
Immunogenetic analysis of the human leukocyte antigen DQA1 locus in patients with duodenal ulcer or chronic atrophic gastritis harbouring Helicobacter pylori.