The lack of influence of CagA positive Helicobacter pylori strains on gastro-oesophageal reflux disease.

摘要

OBJECTIVE infection of the gastric mucosa may influence gastro-oesophageal reflux disease (GORD). The protein of cytotoxin associated gene A (CagA) is assumed to be a virulence factor of. CagA positive strains may induce severe gastroduodenal peptic ulcer disease. The aim of this study was to evaluate the association between strains expressing CagA and GORD.SUBJECTS AND METHODS Nine hundred and thirty patients were examined by endoscopy. Antral and corpus biopsies for the urease test and serum samples for the detection of IgG antibodies to CagA were taken. Serum samples were assayed by using the western blot technique.RESULTS The results from 811 patients were analysed statistically. This study population consisted of 264 infected patients (264/811, 32%). The prevalence was 33% (89/266) in patients with reflux oesophagitis and did not differ from those patients without oesophagitis (175/545, 32%). In contrast, patients with Barrett's oesophagus showed a significantly lower prevalence of infection than the other three groups (8/35, 23%). There was no significant influence of CagA, as one of the virulence factors, on GORD. Antibodies against CagA were slightly, but insignificantly, more frequent in patients with oesophagitis (55/89, 62%) than in patients without oesophagitis (94/175, 54%). CONCLUSIONS In a large cohort of GORD patients no significant difference in the prevalence of in patients with and without GORD was found. In addition, there is no correlation between patients carrying CagA positive strains and development of reflux oesophagitis. However, in the case of histopathologically proven Barrett's oesophagus the prevalence of was significantly lower. The influence of CagA positive strains on oesophageal mucosa is discussed.