Psoriasis as a Potential Risk Factor for Inflammatory Bowel Disease: Findings from a Nationally Representative Korean...

Area of Science:

• Immunodermatology
• Gastroenterology
• Epidemiology

Background:

• Psoriasis and inflammatory bowel disease (IBD) share immune-mediated pathways.
• Previous studies suggest a psoriasis-IBD link, but Asian data are limited.
• This study investigates the association in a nationwide Korean cohort.

Purpose of the Study:

• To assess the association between psoriasis and the risk of developing IBD in a Korean population.
• To determine if the association differs between ulcerative colitis (UC) and Crohn's disease (CD).

Main Methods:

• Retrospective, nested case-control study using Korean National Health Insurance Service data (2002-2019).
• 10,966 IBD cases matched 1:4 to 43,864 controls.
• Weighted logistic regression analyzed psoriasis history and IBD risk.

Main Results:

• Psoriasis was associated with a 1.63-fold increased risk of IBD.
• The risk was higher for UC (aOR 1.77) than for CD (aOR 1.37).
• Increased UC risk was observed across most subgroups; CD risk was significant only in those <45 years.

Conclusions:

• Psoriasis is linked to a significantly increased risk of subsequent IBD, particularly UC, in the Korean population.
• Findings suggest potential shared pathophysiology and highlight the need for gastrointestinal comorbidity screening in psoriasis patients.
• While causality isn't proven, the association warrants clinical consideration.