Background: The definition of Helicobacter pylori-negative gastric cancer depends on the accuracy of diagnosis of H. pylori infection. The aim of this study was to determine the frequency of H. pylori-negative gastric cancer and to clarify relationships with histological atrophy, endoscopic atrophy, and serological atrophy. Methods: A total of 240 early gastric cancers were included in this study. The status of H. pylori infection was determined from the rapid urease test, 13C-urea breath test, H. pylori culture, histopathological examination and examination of IgG antibodies. In H. pylori-negative gastric cancer, histological atrophy and intestinal metaplasia, endoscopic atrophy and serological atrophy were assessed by pepsinogen. Results: The rate of H. pylori infection was 77.9% and 19 patients (7.9%) had a history of eradication. 34 patients (14.2%) were diagnosed with H. pylori-negative gastric cancer using diagnostic tools of H. pylori. However, most of the patients with H. pylori-negative gastric cancer had histological atrophy and intestinal metaplasia. Only 1 gastric cancer (0.42%) occurred in the mucosa without histological atrophy, endoscopic atrophy or serological atrophy. Conclusion: Early gastric cancers in the Japanese endoscopic submucosal dissection series were strongly related to current or past infection with H. pylori and to gastric mucosal atrophy.

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