New Therapeutic Strategies Have Changed the Natural History of Pediatric Crohn’s Disease: A Two-Decade Population-Based Study

We evaluated the impact of immunosuppressants (IS) and anti-tumor necrosis factor (TNF) introduction on Crohn's disease (CD) long-term outcomes in a large population-based, pediatric-onset cohort.All patients included in the EPIMAD registry with a diagnosis of CD occurring when they were younger than age 17 years and between 1988 and 2011 were followed up retrospectively until 2013. Three diagnostic periods were defined: 1988 to 1993 (period [P]1; pre-IS era), 1994 to 2000 (P2; pre-anti-TNF era), and 2001 to 2011 (P3; anti-TNF era). Medication exposure and disease outcomes were compared between the 3 diagnostic periods.A total of 1007 patients diagnosed with CD were followed up for a median duration of 8.8 years (interquartile range, 4.6-14.2 y). The IS and anti-TNF exposure rate at 5 years increased over time from 33.9% (in P1) to 76.5% (in P3) and from 0% (in P1) to 50.5% (in P3), respectively. In parallel, the risk for intestinal resection at 5 years decreased significantly over time (P1, 35%; P2, 31%; and P3, 22%; P = .0003, Ptrendlt; .0001), and between the pre-anti-TNF era (P1 + P2, 32%) and the anti-TNF era (P3, 22%) (P = .0007). The risk for progression from inflammatory to stricturing behavior decreased significantly over time (P1, 27%; P2, 28%; and P3, 20%; P = .11, Ptrend = .041) and between the pre-anti-TNF era (P1 + P2, 28%) and the anti-TNF era (P3, 20%) (P = .040). The risk for a CD flare-related hospitalization at 5 years remained stable over time (P1, 31%; P2, 31%; and P3, 29%; P = .76, Ptrend = .53).In parallel with the increased use of IS and anti-TNF, positive changes in the natural history of pediatric-onset CD were observed at the population level. A decreased risk of both intestinal resections and stricturing complications were observed during the anti-TNF era.