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Microbiome and Gastric Cancer

Abstract

The late 1800s Louis Pasteur and Robert Koch introduced and popularized the germ theory of disease. At that time, gastric cancer was the most common cause of cancer deaths in most countries making the stomach an early site of microbial research with a focus on gastric luminal and mucosal bacteria and the role of Boas-Oppler bacillus (Lactobacillus) in the diagnosis of gastric cancer. In the 1970s, the research focus evolved to studies of the gastric microbiome in the production of nitrosamines and included development of the Correa cascade. Interest in nitrosamine production peaked in the late 1980s and was replaced by studies of the newly described Helicobacter pylori and studies of its role in gastritis, gastric atrophy, and gastric cancer. The last decade has witnessed a rebirth in interest in the gastric microbiota as part of worldwide interest in the human microbiome. Although fungi were prominent in the studies of gastric microbiology in the nineteenth century, their potential role in disease pathogenesis has yet to be addressed using modern techniques. Overall, current studies of the gastric bacterial microbiome do not provide convincing evidence to expand the role of the gastric microbiome in cancer pathogenesis beyond what is directly attributable to the oncogenic potential of H. pylori and its role in persisting acute-on-chronic inflammation.

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Funding

Dr. Engstrand is supported in part by Ferring Phamaceuticals (public–private partnership) and grants from European Union (Horizon 2020) and the Swedish research council. Dr. Graham is supported in part by the Office of Research and Development Medical Research Service Department of Veterans Affairs, Public Health Service grant DK56338 which funds the Texas Medical Center Digestive Diseases Center.

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Correspondence to David Y. Graham.

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Conflicts of interest

Dr. Graham is a consultant for RedHill Biopharma and Phathom Pharmaceuticals regarding novel H. pylori therapies and has received research support for culture of Helicobacter pylori and is the PI of an international study of the use of antimycobacterial therapy for Crohn’s disease. Dr. Engstrand has no relevant conflicts.

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Engstrand, L., Graham, D.Y. Microbiome and Gastric Cancer. Dig Dis Sci (2020). https://doi.org/10.1007/s10620-020-06101-z

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Keywords

  • Helicobacter pylori
  • Microbiome
  • Gastric cancer
  • Inflammation
  • Culture
  • Next-generation sequencing