Association between chronic kidney disease and risk of bullous pemphigoid: a nationwide population‐based cohort study.

Summary: Background: Studies have shown that bullous pemphigoid (BP) occurs in patients with chronic kidney disease (CKD). However, the risk of developing BP in patients with CKD remains inconclusive. Objective: To investigate whether CKD increases the risk of BP. Methods: Participants were recruited from the National Health Insurance Database of Taiwan between 2007 and 2018. Overall, 637,664 newly diagnosed patients with CKD and 637,664 age‐, sex‐, and comorbidity‐matched non‐CKD participants were selected. A competing risk model was used to evaluate the risk of development of BP. Results: After adjusting for age, sex, and comorbid diseases in the multivariate model, CKD was a significant risk factor for BP (adjusted hazard ratio [aHR]: 1.29; 95% confidence interval [CI]: 1.17–1.42; p < 0.001). CKD patients were classified into the dialytic or non‐dialytic groups and compared to non‐CKD participants, and this revealed that patients with dialysis‐dependent CKD had the highest risk of BP (aHR 1.75; 95% CI 1.51–2.03), followed by patients with non‐dialysis‐dependent CKD (aHR 1.20; 95% CI 1.08–1.32). Limitations: We lacked detailed laboratory data on the severity of CKD. Conclusions: Compared with individuals without CKD, those with CKD had a 1.3‐fold increased risk of BP. Patients with dialysis‐dependent CKD had an even higher BP risk (1.8‐fold). [ABSTRACT FROM AUTHOR]