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Background Treatment cost, efficacy, and safety are integral considerations when optimizing management of Crohn’s disease (CD). This study assessed the cost-effectiveness of initial immunomodulator and anti–tumor necrosis factor (anti-TNF) agents for the treatment of CD from a US third-party perspective, incorporating current treatment algorithms, optimization strategies, and reduced costs availed by biosimilars. Method A 1-year Markov model was developed to simulate the cost and quality-adjusted life-years (QALYs) of initial azathioprine, infliximab, and combination therapy for moderate to severe CD. Treatment was changed based on tolerability and clinical disease activity at 3-monthly intervals. Efficacy data were based on published literature. Results Initial azathioprine had the lowest cost and utility ($35,337 and 0.63 QALYs), whereas combination therapy was the costliest yet conferred the highest health benefits ($57,638 and 0.67 QALYs). The incremental cost-effectiveness of infliximab and combination therapy compared with azathioprine were both in excess of $500,000 per QALY gained. Initial azathioprine remained the most cost-effective treatment on sensitivity analysis compared with infliximab and combination therapy, with 90% reductions in anti-TNF therapy costs and a 5-year time horizon, although combination therapy had an acceptable cost-effectiveness when costs were reduced in the extended model. Initial infliximab, ustekinumab, and vedolizumab were dominated by combination therapy. Conclusions In the biosimilar era, initial azathioprine with escalation to infliximab appeared more cost-effective in the short term compared with infliximab or combination therapy, although initial combination therapy yields acceptable ICERs in the long term with continued reductions in anti-TNF therapy costs and will likely be the preferred treatment strategy in the future.

The Cost-effectiveness of Initial Immunomodulators or Infliximab Using Modern Optimization Strategies for Crohn’s Disease in the Biosimilar Era