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. 2024 Apr 2;20(5):38.
doi: 10.3892/mco.2024.2736. eCollection 2024 May.

Causal relationship between gut microbiota and gastric cancer: A two‑sample Mendelian randomization analysis

Jianling Zhang  1 , Chunlu Dong  2 , Yanyan Lin  2 , Lifeng Shang  3 , Junming Ma  4 , Ruiping Hu  5 , Hejing Wang  6
Affiliations

Causal relationship between gut microbiota and gastric cancer: A two‑sample Mendelian randomization analysis

Jianling Zhang et al. Mol Clin Oncol. .

Abstract

The gut microbiota is associated with GC; however, the causal association between the gut microbiota and GC remains to be determined. The aim of the present study was to investigate the causal association between gut microbiota and gastric cancer (GC) from the perspective of Mendelian randomization (MR). The present study performed MR analysis using summary statistics from a genome-wide association study of the gut microbiome and GC. Inverse-variance weighted, MR-Egger and weighted median methods were used to investigate the causal relationship between gut microbiota and GC. Heterogeneity tests were performed using Cochrane's Q statistic. Horizontal polytropy was detected using Mendelian Randomization Pleiotropy RESidual Sum and Outlier were eliminated. Estimates from MR indicated that nine gut microorganism remained stable with regard to acceptance of heterogeneity and sensitivity methods. Among them, the genera Prevotella 7, Roseburia and Ruminococcaceae UCG014 were associated with an increased risk of GC; by contrast, the family Enterobacteriaceae, the genera Allisonella, Lachnospiraceae FCS020, Ruminococcaceae UCG004 and Ruminococcaceae UCG009, and the order Enterobacteriales decreased the risk of GC development. The present study demonstrated the potential importance of modulating the abundance of gut microbiota for the prevention and treatment of GC.

Keywords: Mendelian randomization; causal relationship; gastric cancer; genome-wide association study; gut microbiota.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Figure 1
Figure 1
Overview of Mendelian randomization analysis. SNP, single nucleotide polymorphism.
Figure 2
Figure 2
Primary Mendelian randomization results of gastric cancer.
See this image and copyright information in PMC

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Grants and funding

Funding: The present study was supported by the 2021 Natural Science Foundation of Gansu Province (grant no. 21JR7RA670).