Early Initiation of Tumor Necrosis Factor Antagonist-Based Therapy for Patients With Crohn's Disease Reduces Costs Compared With Late Initiation

The authors aimed to determine the cost effectiveness of initiating treatment early in the disease course (within 2 years of CD diagnosis) vs later in the disease course (more than 2 years after diagnosis). To do so, the authors constructed a Markov model of a hypothetical cohort of patients with CD in Canada to simulate disease progression after initiation of infliximab or adalimumab therapy. They used published loss-of-response rates to compare the lifetime cost effectiveness of early vs late initiation of anti-TNF therapies. Transition probabilities and utilities were obtained through a literature search, and costs were obtained from the Alberta Ministry of Health. Sensitivity analysis was used to characterize uncertainty.