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These data demonstrate sustained effectiveness of infliximab in children and adolescents with luminal CD. Durability of response is increased by concomitant immunomodulation. Clinical response is associated with enhanced linear growth, particularly when therapy is initiated early.

Diagnostic delay was more common in CD and associated with height impairment that persisted 1 year after presentation. The greatest contributor to time to diagnosis was time from symptom onset to referral.

The existing limited evidence does not support an association between any TDM strategy and superior clinical remission rates but does support a cost savings benefit [particularly for reactive TDM] and suggests a potential benefit for anti-TNF durability [particularly proactive TDM]. Additional, longer-term studies are needed, particularly to further investigate proactive TDM, and to generate data on other anti-TNF agents, the induction period and paediatric populations.