Background: Helicobacter pylori and non-steroidal anti-inflammatory drugs (NSAIDs) are recognized as the major causes of peptic ulcer disease. The status of H. pylori infection in the background population may influence the incidence of H. pylori-negative peptic ulcer disease.
Objective: To examine the incidence of H. pylori-negative peptic ulcer disease without intake of NSAIDs in Japan.
Patients: A total of 398 patients who had no eradication therapy for H. pylori prior to this study, including 246 patients with gastric ulcer (GU) and 152 patients with duodenal ulcer (DU), were enrolled.
Methods: H. pylori status was assessed by rapid urease tests, histological examinations (haematoxylin & eosin stain, Giemsa stain and/or immunostaining) and serum IgG antibody. Two biopsy specimens were taken from the antrum within 3 cm of the pyloric and two from the middle corpus of the stomach, along the greater curvature. Patients were asked a series of questions regarding risk factors, including the use of NSAIDs. The presence of gastritis, gastric atrophy and intestinal metaplasia was examined according to the updated Sydney system.
Results: Of the 246 patients with GU, 12 patients (4.9%) were considered to be H. pylori-negative. Of the 152 patients with DU, two patients (1.3%) were considered to be H. pylori-negative. Hence, a total of 14 patients were found to be H. pylori-negative. Nine of them were taking NSAIDs. Consequently, the frequency of H. pylori-negative ulcer without intake of NSAIDs was 1.3%. There was no significant difference in the frequencies of H. pylori-negative patients between the GU and DU groups.
Conclusion: The incidence of H. pylori-negative peptic ulcer disease without intake of NSAIDs was very low in the Japanese population.
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