Secukinumab-Induced Crohn's Disease in a Patient Treated for Juvenile Idiopathic Arthritis.

Juvenile idiopathic arthritis (JIA) is a common form of arthritis that occurs in children, typically with an onset before the age of 16 years. It can affect joints in any part of the body. As per the International League of Rheumatology, JIA is classified into systemic arthritis, oligoarthritis, extended oligoarthritis, polyarthritis (rheumatoid factor positive), polyarthritis (rheumatoid factor negative), enthesitis-related arthritis (ERA), juvenile psoriatic arthritis (JPsA), and other arthritis . JIA is treated with disease-modifying antirheumatic medications (DMARDs), which include both nonbiologic agents like methotrexate (MTX) and biologic agents like inhibitors of tumor necrosis factor-alpha, interleukin-1 (IL-1), IL-6, and T-cell co-stimulation modulators. As per recent studies, in December 2021, Secukinumab, an IL-17A inhibitor, is one of the most recent biologic agents approved for active ERA and JPsA. A few reports have suggested Secukinumab is related to new-onset inflammatory bowel diseases (IBDs). We present a case of a 20-year-old female who was being treated with Secukinumab for JIA, and six months into therapy, she developed symptoms suggestive of Crohn's disease (CD). The diagnosis was confirmed with colonoscopy, histopathology, and radiology results. Her symptoms completely resolved four weeks after discontinuing Secukinumab and oral steroid therapy. The efficacy and side effects of Secukinumab have been studied mainly on middle-aged populations who were being treated for psoriasis and ankylosing spondylitis (AS); however, there is limited literature on younger populations. With this case report, we would like to highlight the possible relationship between the development of IBD and Secukinumab therapy in the adolescent population and emphasize the importance of regular screening for IBD in this population.