Summary Background Early treatment for Crohn's disease (CD) with immunomodulators and/or anti‐TNF agents improves outcomes in comparison to a slower ‘step up’ algorithm. However, there remains a limited ability to identify those who would benefit most from early intensive therapy. Aim To develop a validated, individualised, web‐based tool for patients and clinicians to visualise individualised risks for developing Crohn's disease complications. Methods A well‐characterised cohort of adult patients with CD was analysed. Available data included: demographics; clinical characteristics; serologic immune responses; NOD2 status; time from diagnosis to complication; and medication exposure. Cox proportional analyses were performed to model the probability of developing a CD complication over time. The Cox model was validated externally in two independent CD cohorts. Using system dynamics analysis (SDA), these results were transformed into a simple graphical web‐based display to show patients their individualised probability of developing a complication over a 3‐year period. Results Two hundered and forty three CD patients were included in the final model of which 142 experienced a complication. Significant variables in the multivariate Cox model included small bowel disease (HR 2.12, CI 1.05–4.29), left colonic disease (HR 0.73, CI 0.49–1.09), perianal disease (HR 4.12, CI 1.01–16.88), ASCA (HR 1.35, CI 1.16–1.58), Cbir (HR 1.29, CI 1.07–1.55), ANCA (HR 0.77, CI 0.62–0.95), and the NOD2 frameshift mutation/SNP13 (HR 2.13, CI 1.33–3.40). The Harrell's C (concordance index for predictive accuracy of the model) = 0.73. When applied to the two external validation cohorts (adult n = 109, pediatric n = 392), the concordance index was 0.73 and 0.75, respectively, for adult and pediatric patients. Conclusions A validated, web‐based tool has been developed to display an individualised predicted outcome for adult patients with Crohn's disease based on clinical, serologic and genetic variables. This tool can be used to help providers and patients make personalised decisions about treatment options.

BACKGROUND-Immunomodulators and biologics are effective treatments for children with Crohn's disease (CD). The challenge of communicating the anticipated disease course with and without therapy to patients and parents is a barrier to the timely use of these agents. The aim of this project was to develop a tool to graphically display the predicted risks of CD and expected benefits of therapy.

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