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Zhao, Jiaxi; Li, Kaixin; Liao, Xiaoyang; Zhao, Qian
Scientific reports, 07/2023, Volume: 13, Issue: 1Journal Article
Inflammatory bowel disease (IBD) has been reported to be associated with hepatobiliary diseases. Previous observational and Mendelian randomization (MR) studies have suggested a causal association between IBD and primary sclerosing cholangitis (PSC). However, it is unclear whether IBD has a causal association with primary biliary cholangitis (PBC): another autoimmune liver disease. We obtained genome-wide association study (GWAS) statistics from published GWASs for PBC, UC, and CD. We screened qualified instrumental variables (IVs) based on the three major assumptions of MR. To determine the causal relationships between UC or CD and PBC, two-sample MR analyses were performed using inverse variance-weighted (IVW), MR-Egger, and weighted median (WM) methods, and sensitivity analyses were conducted to validate the robustness of the results. We also conducted reverse MR analysis to reveal the causal association between PBC and UC or CD. UC was associated with a higher risk of PBC (OR 1.35, 95% CI 1.05-1.73, P = 0.02) in the IVW method, and CD was associated with an increased risk of PBC (OR 1.18, 95% CI 1.03-1.36, P = 0.02) in IVW. The weighted median and MR-Egger regression of both diseases showed a consistent direction but were not statistically significant. Results of the reverse MR analysis did not suggest genetic susceptibility that PBC was associated with an increased risk of UC (OR 1.05, 95% CI 0.95-1.17, P = 0.34) or CD (OR 1.1, 95% CI 0.99-1.20, P = 0.06). The present study revealed that IBD subtypes could increase the incidence of PBC, but in turn, PBC did not increase the incidence of IBD subtypes. Understanding that IBD and PBC constitute mutual risk factors can help with the clinical management of both diseases.
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