• 1. Dalian Medical University, Dalian, 116000, Liaoning, P. R. China;
  • 2. Department of Thoracic Surgery, Northern Jiangsu People's Hospital, Yangzhou, 225001, Jiangsu, P. R. China;
SHU Yusheng, Email: shuyusheng65@163.com
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Objective  To assess any potential associations between lung cancer and gut microbiota. Methods  Mendelian randomization (MR) analysis was carried out by utilizing summary data from genome-wide association studies (GWAS) of the gut microbiota and lung cancer. The gut microbiota served as an exposure. Instrumental ariables (IVs) were identified from the GWAS of 18340 participants. The GWAS study of lung cancer from Europe served as an outcome, including 29 266 lung cancer patients and 56450 controls. We used the inverse-variance weighted (IVW) method as the primary analysis. Sensitivity analysis was used to test the reliability of MR analysis results. Results  IVW results showed that Genus Parabacteroides (OR=1.258, 95%CI 1.034 to 1.531, P=0.022) and Phylum Bacteroidetes (OR=1.192, 95%CI 1.001 to 1.419, P=0.048) had a positive causal association with lung cancer, and there was a negative causal association between family Bifidobacteriaceae (OR=0.845, 95%CI 0.721 to 0.989, P=0.037) and order Bifidobacteriales (OR=0.865, 95%CI 0.721 to 0.989, P=0.037) with lung cancer. Sensitivity analysis showed no evidence of reverse causality, pleiotropy, and heterogeneity. Conclusion  This study demonstrates that Genus Parabacteroides and Phylum Bacteroidetes are related to an increased risk of lung cancer, family Bifidobacteriaceae and order Bifidobacteriales can reduce the risk of lung cancer. Our thorough investigations provide evidence in favor of a potential causal relationship between a number of gut microbiota-taxa and lung cancer. To demonstrate how gut microbiota influences the development of lung cancer, further research is necessary.

Citation: REN Qinglin, HE Wenbo, YUE Jiarui, XIAO Hongbi, SHU Yusheng. Association of lung cancer and gut microbiota: A two-sample Mendelian randomization analysis. Chinese Journal of Clinical Thoracic and Cardiovascular Surgery, 2023, 30(11): 1618-1627. doi: 10.7507/1007-4848.202307033 Copy

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