Objective: To determine discontinuation rate and degree of adherence to first-line treatment with interferon-beta (INFβ) in patients with multiple sclerosis (MS), identifying causes and associated factors.
Material and method: A retrospective observational study that included patients with MS treated with INFβ during 2001. The patients were followed-up from the beginning of treatment until the end of 2006. The data sources used were a computer database compiled in the outpatients' area, medical records and application protocols for beginning and monitoring treatment for MS. Patient characteristics at baseline, treatment and continuity were included in the information collected.
Results: The study included 131 patients. Mean follow-up was 74 ± 26 years. 641% of the patients were treated with only one drug during the study. At 2 years follow-up 99% of patients had discontinued INFβ therapy and at 5 years 412% had done so. Men, patients with relapsing-remitting MS and those treated with INFβ1a i.m. continued treatment for a longer period, but this was statistically significant only in patients with 10 years or less of disease progression at the beginning of therapy. Main causes of discontinuation were lack of efficacy (388%) and adverse effects (328%). Compliant patients presented lower discontinuation rates (558% vs. 75%).
Conclusions: treatment of MS patients with IFNβ is discontinued mainly due to lack of efficacy and adverse effects. Greater understanding of patients' views can help to identify those at greatest risk of lack of adherence, thereby helping to improve treatment.
Copyright © 2010 SEFH. Published by Elsevier Espana. All rights reserved.