Risk of incident autoimmune diseases in patients with newly diagnosed psoriatic disease: a nationwide population-based study

There are limited large population-based cohort studies on the risk of incident autoimmune diseases among patients with newly diagnosed psoriatic disease. The objective of this study was to assess the risk of autoimmune diseases in patients with newly diagnosed psoriatic disease. Using the Korean National Health Insurance Service database, patients with newly diagnosed psoriatic disease between 2007 and 2019 were included. Comparators were randomly selected and matched according to age and sex. A total of 321,354 patients with psoriatic disease and 321,354 matched comparators were included in this study. Patients with psoriatic disease had a significantly higher risk of Crohn’s disease [adjusted hazard ratio (aHR), 1.95; 95% confidence interval (CI) 1.42–2.67], ulcerative colitis (aHR, 1.65; 95% CI 1.39–1.96), systemic lupus erythematosus (aHR, 1.86; 95% CI 1.34–2.57), rheumatoid arthritis (aHR, 1.63; 95% CI 1.52–1.76), ankylosing spondylitis (aHR, 2.32; 95% CI 1.95–2.77), alopecia areata (aHR, 1.41; 95% CI 1.35–1.46), and type 1 diabetes (aHR, 1.23; 95% CI 1.11–1.37). However, the risk of Graves’ disease, Hashimoto’s disease, Sjögren’s syndrome, and systemic sclerosis was not significantly different between the groups. In conclusion, patients with newly diagnosed psoriatic disease may have a significantly increased risk of incident autoimmune diseases.