Year 2016 / Volume 108 / Number 9
Original
Gastric microbiota and carcinogenesis: the role of non-Helicobacter pylori bacteria - A systematic review

530-540

DOI: 10.17235/reed.2016.4261/2016

Emanuel Dias-Jácome, Diogo Libânio, Marta Borges-Canha, Ana Galaghar, Pedro Pimentel-Nunes,

Abstract
Background and aim: Helicobacter pylori is the strongest risk factor for gastric cancer. However, recent advances in DNA sequencing technology have revealed a complex microbial community in the stomach that could also contribute to the development of gastric cancer. The aim of this study was to present recent scientific evidence regarding the role of non-Helicobacter pylori bacteria in gastric carcinogenesis. Methods: A systematic review of original articles published in PubMed in the last ten years related to gastric microbiota and gastric cancer in humans was performed. Results: Thirteen original articles were included. The constitution of gastric microbiota appears to be significantly affected by gastric cancer and premalignant lesions. In fact, differences in gastric microbiota have been documented, depending on Helicobacter pylori status and gastric conditions, such as non-atrophic gastritis, intestinal metaplasia and cancer. Gastric carcinogenesis can be associated with an increase in many bacteria (such as Lactobacillus coleohominis, Klebsiella pneumoniae or Acinetobacter baumannii) as well as decrease in others (such as Porphyromonas spp, Neisseria spp, Prevotella pallens or Streptococcus sinensis). However, there is no conclusive data that confirms if these changes in microbiota are a cause or consequence of the process of carcinogenesis. Conclusions: Even though there is limited evidence in humans, microbiota differences between normal individuals, pre-malignant lesions and gastric cancer could suggest a progressive shift in the constitution of gastric microbiota in carcinogenesis, possibly resulting from a complex cross-talk between gastric microbiota and Helicobacter pylori. However, further studies are needed to elucidate the specific role (if any) of different microorganisms.
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Dias-Jácome E, Libânio D, Borges-Canha M, Galaghar A, Pimentel-Nunes P. Gastric microbiota and carcinogenesis: the role of non-Helicobacter pylori bacteria - A systematic review. 4261/2016


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Publication history

Received: 10/02/2016

Accepted: 13/06/2016

Online First: 08/09/2016

Published: 06/09/2016

Article revision time: 119 days

Article Online First time: 211 days

Article editing time: 209 days


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