Objective: To assess the cost-effectiveness of colorectal cancer screening using computed tomography colonography (CTC) and immunological fecal occult blood test (iFOBT).
Methods: CTC and iFOBT strategies were compared with Nn screening or guaiac FOBT (gFOBT) using Markov modeling. CTC was proposed at 50, 60, and 70 years, whereas gFOBT and iFOBT were performed every 2 years beginning at 50 years until 74 years of age with a 30-year time horizon. We calculated incremental cost-effectiveness ratios and efficiency ratios (ERs). Then, we performed univariate and probabilistic sensitivity analyses.
Results: With gFOBT as reference, colorectal cancer prevention rate was 18% for CTC and 11% for iFOBT. The incremental cost-effectiveness ratio of CTC and iFOBT were respectively 3204 and 5458 euro per life years gained (LYG), the ER for CTC was 0.22 and the ER for iFOBT was 2.08 colonoscopies per LYG. Cost-effectiveness results were sensitive to CTC cost. In the probabilistic sensitivity analysis, compared with CTC, iFOBT strategy was cost-effective for 84.6% of simulations when we assumed a willingness to pay (WTP) of 20,000 euro/LYG.
Conclusion: CTC requires substantially less colonoscopies than iFOBT and is cost-effective for low values of WTP. However, iFOBT is the preferred screening strategy for a WTP greater than 6207 euro/LYG.
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