RT Journal Article
SR Electronic
T1 Changes in gastric mucosal microbiota in gastric carcinogenesis: a systematic review protocol
JF BMJ Open
JO BMJ Open
FD British Medical Journal Publishing Group
SP e045810
DO 10.1136/bmjopen-2020-045810
VO 11
IS 3
A1 Ruoyu Ji
A1 Xinyu Zhao
A1 Xinyuan Cao
A1 Yizhen Zhang
A1 Yingyun Yang
YR 2021
UL http://bmjopen.bmj.com/content/11/3/e045810.abstract
AB Introduction The human stomach is a complex and diverse microbial ecosystem. Consecutive alternations of gastric microbiota occur in gastric carcinogenesis, while the changing pattern during this process remains controversial across studies. We aim to identify the changes in the diversity and composition of gastric mucosal microbiota in gastric tumorigenesis.Methods and analysis We will search through PubMed, EMBASE and Cochrane databases, as well as conference proceedings and references of review articles for observational articles reporting either the relative abundance of bacteria at the phylum or genus level or at least one of the alpha diversity indexes respectively and clearly in both gastric cancer and non-cancer groups. Selection of studies and data extraction will be performed independently by two researchers. Disagreements will be resolved through discussion. Risk of bias will be assessed using the modified Newcastle-Ottawa Scale. Quantitative analyses will be performed using a random effects model, where the effect measurement will be expressed as the MD.Ethics and dissemination Ethical approval for this systematic review is not required, as the study is based exclusively on published documents and will not include any individual data. Findings of this study are expected to be disseminated through peer-reviewed journals or conference proceedings.PROSPERO registration number CRD42020206973.