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  • Title: Causal association between autoimmune liver disease and Sjögren's syndrome: A Mendelian randomization study.
    Author: Li Y, Wang J, Jiang H, Zhang J, Qi J, Jiang Z, Chen L, Ying Z.
    Journal: Int J Rheum Dis; 2024 May; 27(5):e15151. PubMed ID: 38720573.
    Abstract:
    BACKGROUND: Observational studies have found an association between autoimmune liver disease (AILD) and Sjögren's syndrome (SS). However, the causal relationship between the two remains unknown. Clinical guidelines indicate that the coexistence of AILD with other autoimmune diseases may impact prognosis and quality of life; hence, early recognition and management of extrahepatic autoimmune diseases is particularly crucial. Against this backdrop, this study aimed to utilize Mendelian randomization (MR) methods to investigate the potential causal relationship between AILD and SS. METHODS: We extracted summary statistics on AILD and SS from publicly available genome-wide association studies (GWAS) databases to identify appropriate instrumental variables (IVs). The inverse-variance weighted (IVW) method was utilized as the primary approach, with the weighted median (WM) method and MR-Egger method employed as supplementary methods to evaluate the potential causal relationship between the two conditions. Sensitivity analyses, including Cochran's Q test, MR-polynomial residuals and outliers (MR-PRESSO), MR-Egger intercept test, and the leave-one-out test, were performed to assess the stability of the results. RESULTS: The MR study results indicate a significant causal relationship between PBC and PSC with the risk of SS in the European population (IVW: odds ratio [OR] = 1.155, 95% confidence interval [CI]: 1.092-1.222, p < .001; IVW: OR = 1.162, 95% CI: 1.051-1.284, p = .003). A series of sensitivity analyses have confirmed the reliability of the results. CONCLUSIONS: Our study indicates that the presence of both PBC and PSC increases the susceptibility to SS. However, no reliable causal relationship was found between SS and the risk of PBC or PSC. These findings contribute to elucidating the potential pathogenic mechanisms of the disease and are of significant importance for the management of patients with PBC and PSC.
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