Abstract Background Long-term data on the efficacy and safety of biologics in pediatric inflammatory bowel disease (IBD) are crucial for guiding clinicians in optimizing their use. This study aims to evaluate real-life durability, usage patterns, and factors influencing treatment discontinuation in pediatric IBD. Methods This registry-based study analyzed data of patients from the IBD registry of the Italian Society of Pediatric Gastroenterology, Hepatology and Nutrition (SIGENP) who started biologic therapy between 2009 and 2022, with a minimum 1-year follow-up. Results 1184 patients (749 Crohn’s Disease [CD], 437 Ulcerative Colitis or IBD-undetermined [UC/IBD-U]) were retrieved. The median follow-up was 43 months (IQR 28-64). Infliximab was the first biologic in 807 patients (68%) followed by adalimumab in 378 patients (31%). 393 patients (33%) received a second-line biologic, 107 (9%) a third-line and 24 (2%) a fourth-line. At last follow-up, 544 patients (47%) had discontinued the first biologic, with a median time to discontinuation of 14 months (IQR 5-27). Main reasons were loss of response (36%) followed by primary non-response (33%) and infusion reactions (13%). For first-line biologics, treatment durability was superior in patients who received adalimumab compared to infliximab (Figure 1a) and in patients managed with TDM (Figure 2b). In the multivariate analysis risk factors for first biologic discontinuation were age < 6 years (HR 1.8, 95%CI 1.3-2.4), UC/IBD-U (HR 1.4, 95%CI 1.1-1.8), moderate/severe disease activity (HR 1.3, 95%CI 1.1-1.6) and Infliximab vs adalimumab (HR 2.1; 95% CI 1.6-2.7) while the use of TDM emerged as protective, significantly lowering the risk (HR 0.50; 95% CI 0.40-0.63). Combination therapy did not influence biologic durability (HR 0.95; 95% CI 0.77-1.18). Conclusion strategies for optimizing treatment efficacy of biologics in pediatric IBD should be tailored considering patients age, IBD type and severity and integrating TDM in patients’ management. The contribution of concomitant immunomodulation in the pediatric setting might be negligible.
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