Abstract Background Long-term data on the use of vedolizumab in children with Crohn’s disease (CD) and ulcerative colitis (UC) are lacking and the drug is not yet approved in pediatrics. The VEDOKIDS prospective multicenter cohort study aimed to assess the effectiveness and safety of vedolizumab as maintenance therapy in children with CD and UC; this study reports the 3-year final visit outcomes (ClinicalTrials.gov, NCT02862132). Methods Children commenced on vedolizumab at any disease duration and with any degree of disease activity were enrolled in 17 pediatric centers in Europe, the USA and the Middle East and followed prospectively through 3 years. The primary outcome was complete remission at 3 years (i.e. steroid-free clinical remission and normal ESR/CRP with sustained vedolizumab treatment and without a surgery). Secondary outcome was loss of response (PUCAI ≥ 10 or wPCDAI ≥ 12.5 for children with UC and CD, respectively) in those achieving clinical remission at week 6. Results Altogether, 137 children were enrolled, of whom 53 (39%) continued vedolizumab treatment through three years. Sustainability rate was higher in UC (35/73 [48%]) than in CD (18/64 [28%]; OR 2.4 [95%CI 1.2-4.8]). Complete remission at three years was achieved in 19/73 (26%) children with UC vs. 9/64 (14%) with CD (OR 2.2 [95%CI 0.9-5.2]) using ITT analysis. The best predictor of complete remission at 3 years was clinical remission at week 6 measured in CD by wPCDAI ≤12.5 (AUROC 0.78 [95%CI 0.64-0.963]), and in UC by PUCAI<10 (AUROC 0.74 [0.63-0.85]). Similarly, in adjusted multivariable logistic regression, complete remission at 3 years was more likely in week-6 remitters or responders compared to non-responders (HR 2.6 [95%CI 1.1-7.2]). Of the 51 (37%) children who achieved clinical remission at week 6 (32 UC and 19 CD), the likelihood of achieving complete remission at 3 years was 41% for UC and 26% for CD (OR 1.9 [95%CI 0.6-6.6]). Of those achieving clinical remission at week 6, 22%, 28%, 31% and 38% lost response by 30, 54, 108 and 162 weeks, respectively, for UC, while for the fewer children with CD who achieved remission at week 6, 5%, 5%, 11% and 16%, respectively, lost response (Figure). Forty adverse events were recorded in 23 children (17%) as possibly related to vedolizumab, none were serious, with the most common being headache, myalgia and fever. Conclusion Vedolizumab was safe and effective for maintaining long-term remission in children with UC and CD. Remission rates were higher in UC compared to CD at the end of induction, but UC patients experienced a higher rate of loss of response over time. Achieving clinical remission by week 6 after initiation of the drug was the best predictor of long-term effectiveness in both UC and CD.
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