Inflammatory bowel disease among patients with psoriasis treated with ixekizumab: A presentation of adjudicated data from an integrated database of 7 randomized controlled and uncontrolled trials

Background Inflammatory bowel disease (IBD) occurs more frequently in patients with psoriasis. The 2 diseases have significant genetic overlap, but the pathogenesis underlying their co-occurrence is unknown. Objective We sought to report adjudicated IBD cases (Crohn's disease [CD] and ulcerative colitis [UC]) in patients exposed to ixekizumab, a high-affinity monoclonal antibody that selectively targets interleukin-17A. Methods Adverse events (AEs) integrated from 7 randomized controlled and uncontrolled trials were analyzed for the controlled induction period, controlled maintenance period, and all ixekizumab-treated patients. Suspected IBD cases were reviewed by blinded external experts using internationally recognized criteria (Registre Epidemiologique des Maladies de l'Appareil Digestif registry). Results In all, 4209 patients (6480 patient-exposure years) were exposed to ixekizumab. Suspected CD (N = 12) or UC (N = 17) AEs were reported; 19 were adjudicated as definite/probable IBD (CD, N = 7, incidence rate = 1.1/1000 patient-exposure years; UC, N = 12, incidence rate = 1.9/1000 patient-exposure years). Among these, 3 occurred during induction (CD, N = 1; UC, N = 2) and 7 during maintenance (CD, N = 4; UC, N = 3). Twelve of 16 patients with reported IBD history have not had an IBD treatment-emergent AE/serious AE to date. Limitations Clinical review (adjudication) was not prespecified. AE data collected post-hoc may have been limited by length of time from occurrence. Conclusion From an integrated database of 7 ixekizumab psoriasis trials, CD and UC cases were uncommon (