Effects of High- and Low-Efficacy Therapy in Secondary Progressive Multiple Sclerosis
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Abstract
Objective To compare the clinical effectiveness of high- and low-efficacy treatments in patients with recently active and inactive secondary progressive multiple sclerosis (SPMS) after accounting for therapeutic lag.
Methods Patients treated with high-efficacy (natalizumab, alemtuzumab, mitoxantrone, ocrelizumab, rituximab, cladribine, fingolimod) or low-efficacy (interferon beta, glatiramer acetate, teriflunomide) therapies after SPMS onset were selected from MSBase and Observatoire Français de la Sclérose en Plaques (OFSEP), 2 large observational cohorts. Therapeutic lag was estimated for each patient from their demographic and clinical characteristics. Propensity score was used to match patients treated with high- and low-efficacy therapies. Outcomes after the period of therapeutic lag was disregarded were compared in paired, pairwise-censored analyses.
Results One thousand patients were included in the primary analysis. Patients with active SPMS treated with high-efficacy therapy experienced less frequent relapses than those on low-efficacy therapy (hazard ratio [HR] 0.7, p = 0.006). In patients with inactive SPMS, there was no evidence for a difference in relapse frequency between groups (HR 0.8, p = 0.39). No evidence for a difference in the risk of disability progression was observed.
Conclusion In treated patients with SPMS, high-efficacy therapy is superior to low-efficacy therapy in reducing relapses in patients with active but not those with inactive SPMS. However, more potent therapies do not offer an advantage in reducing disability progression in this patient group.
Classification of Evidence This study provides Class III evidence that high-efficacy therapy is superior to low-efficacy therapy in reducing relapses in patients with active SPMS, although we did not find a difference in disability progression between patients treated with high- and low-efficacy therapy.
Glossary
- ARR=
- annualized relapse rate;
- ASCEND=
- Effect of Natalizumab on Disease Progression in Secondary Progressive Multiple Sclerosis;
- CI=
- confidence interval;
- DMT=
- disease-modifying therapy;
- EDSS=
- Expanded Disability Status Scale;
- EXPAND=
- Exploring the Efficacy and Safety of Siponimod in Patients With Secondary Progressive Multiple Sclerosis;
- HR=
- hazard ratio;
- MS=
- multiple sclerosis;
- OFSEP=
- Observatoire Français de la Sclérose en Plaques;
- SPECTRIMS=
- Secondary Progressive Efficacy Clinical Trial of Recombinant Interferon-Beta-1a in MS
Footnotes
Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
Editorial, page 407
Patient page e972
Class of Evidence: NPub.org/coe
- Received September 30, 2020.
- Accepted in final form May 19, 2021.
- © 2021 American Academy of Neurology
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