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Objective Depression is common in patients with primary biliary cholangitis （PBC）， but the role of depression in disease progression remains unclear. This study aims to investigate the association between depression and treatment response and the impact of depression on liver cirrhosis in PBC patients. Methods A retrospective analysis was performed for the clinical data of 141 patients with PBC who attended the outpatient service of autoimmune liver diseases in General Hospital of Tianjin Medical University from January 2018 to December 2020 and received standard ursodeoxycholic acid （UDCA） monotherapy for 1 year, and 170 healthy controls, matched for age and sex, who underwent physical examination in Physical Examination Center were enrolled as healthy control group. Patient Health Questionnaire-9（PHQ-9） was used to evaluate depressive state in the patients with PBC and the healthy controls. The independent-samples t test was used for comparison of normally distributed continuous data between two groups, and the Mann-Whitney U test was used for comparison of non-normally distributed continuous data between two groups the chi-square test was used for comparison of categorical data between two groups. The binary logistic regression model and the decision tree model were used to analyze the influencing factors for liver cirrhosis in patients with PBC, as well as the influence of depression and the HLA-DRB1 gene on liver cirrhosis. The receiver operating characteristic （ROC） curve, the area under the ROC curve （AUC), and goodness of fit were used to evaluate model performance. All 13 variables were used to establish a classification and regression tree （CART） model， i.e.， age, sex, PHQ-9 score, the DRB1* 03∶01 gene, and the serum levels of alanine aminotransferase， aspartate aminotransferase， alkaline phosphatase （ALP）， gamma-glutamyl transpeptidase （GGT）， total bilirubin， immunoglobulin G, immunoglobulin M （IgM), C3, and C4. The indications including AUC， sensitivity， and specificity were used to evaluate the performance of CART model in the model cohort. Results Compared with the normal control group， the PBC group had a significantly higher proportion of the patients with depression （53.9% vs 15.3%，χ2 =57.836，P<0.001）. Compared with the PBC patients without depression， the PBC patients with depression had a significantly poorer response to UDCA treatment （χ2 =7.549，P=0.006） and significant increases in the serum levels of ALP （Z=−2.157，P=0.031）， GGT （Z=−2.180，P=0.029）， and IgM （Z=−2.000，P=0.046）. Compared with the PBC patients without depression，the PBC patients carrying the HLA-DRB1* 03∶01 allele had a significant increase in the risk of liver cirrhosis （P<0.001）. The binary logistic regression model analysis showed that PHQ-9 score （OR=1.148，95%CI： 1.050 — 1.255，P=0.002）， the HLA-DRB1* 03∶01 gene （OR=5.150，95%CI：1.362 — 19.478，P=0.016）， age （OR=1.057， 95%CI：1.009—1.106，P=0.018), and serum ALP level （OR=1.009，95%CI：1.001—1.017，P=0.020） were independent risk factors for liver cirrhosis in patients with PBC. The decision tree analysis showed that PHQ-9 score ≥3.5 was also a risk factor for liver cirrhosis in PBC patients. Conclusion Depression is associated with poor treatment response in patients with PBC， and it is an independent risk factor for liver cirrhosis in patients with PBC. This study highlights the important clinical significance of the identification and early management of depressive state in patients with PBC. [ABSTRACT FROM AUTHOR]

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