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Helicobacter pylori (H. pylori) is widely recognized as a definite carcinogen in gastric cancer (GC). Although H. pylori eradication reduces the risk of GC, GC recurrence has been detected even after successful H. pylori eradication. Recently, the analysis of gut microbiota was reported. This study aimed to evaluate the correlation between gastric mucosa-associated microbiota (G-MAM) and early gastric cancer (EGC) after successful H. pylori eradication. In this pilot study, G-MAM were collected during the esophagogastroduodenoscopy of 17 patients, receiving H. pylori eradication therapy at least 5 years ago. The patients were divided into those with EGC (the EGC group, 8 patients) and those without EGC (the NGC group, 9 patients). Microbial samples in the greater curvature of the pyloric site were obtained using an endoscopic cytology brush, and the G-MAM profiles of each sample were analyzed using 16S rRNA V3-V4 gene sequencing. Between the two groups, there was no significant difference in the median age, sex, median period after successful eradication of H. pylori, the α diversity, and the average abundance at the phylum level. At the genus level, the average abundance of Unclassified Oxalobacteraceae, Capnocytophaga, and Haemophilus was significantly lower in the EGC group than in the NGC group (0.89 vs. 0.14%, P < 0.01, 0.28 vs. 0.00%, P < 0.01 and 5.84 vs. 2.16%, P = 0.034, respectively). We demonstrated alternations in the profiles of G-MAM between the two groups. Our results suggest that G-MAM may influence carcinogenesis after successful H. pylori eradication. © 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.


Takahiro Nakano, Osamu Dohi, Tomohisa Takagi, Yuji Naito, Hayato Fukui, Hajime Miyazaki, Takeshi Yasuda, Takuma Yoshida, Yuka Azuma, Tsugitaka Ishida, Hiroaki Kitae, Shinya Matsumura, Shun Takayama, Naoki Mizuno, Saori Kashiwagi, Katsura Mizushima, Ryo Inoue, Toshifumi Doi, Ryohei Hirose, Ken Inoue, Naohisa Yoshida, Kazuhiro Kamada, Kazuhiko Uchiyama, Takeshi Ishikawa, Hideyuki Konishi, Yoshito Itoh. Characteristics of Gastric Mucosa-Associated Microbiota in Patients with Early Gastric Cancer After Successful Helicobacter pylori Eradication. Digestive diseases and sciences. 2023 Dec;68(12):4398-4406

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PMID: 37875607

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