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Abstract
Introduction: Rituximab, an anti-CD20 monoclonal antibody, has shown effectiveness in reducing disease relapses and disability accrual through relapses in patients with neuromyelitis optica spectrum disorders (NMOSD). However, its higher cost compared to oral immunosuppressants raises questions about its cost-effectiveness, particularly in low and middle-income countries. This study aimed to compare the cost-effectiveness of early rituximab treatment versus escalation treatment in NMOSD patients. Methods: We conducted a retrospective study of NMOSD patients treated with rituximab in the first five years of disease at a hospital in São Paulo, Brazil, from 2015 to 2019. The Early Group consisted of NMOSD patients who received rituximab as a first-line treatment. The Escalating Therapy Group included patients who were prescribed rituximab after experiencing disease activity while on oral immunosuppressants, primarily azathioprine. An economic model based on Expanded Disability Status Score (EDSS) transitions was used to assess cost-effectiveness. Cost and utility data were derived from previous studies, and sensitivity analyses for different willingness to pay (WTP) thresholds and percentage of patients upscaling from oral immunossupressants to rituximab were performed. Results: Thirty NMOSD patients were included. In the Early Group, the proportion of patients reaching the highest EDSS states (6.5 or more) decreased over five years compared to baseline. In contrast, the Escalating Therapy Group experienced an increase in this proportion over the same period. Cost-effectiveness was achieved for willingness to pay (WTP) of €20-80,000 in our main analysis, sustained in our sensitivity analysis. Conclusion: Early treatment with rituximab has the potential to lower healthcare costs and enhance quality of life for NMOSD patients, supporting its early prescription for preventive treatment.
Published Version
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