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Published in: Neurology and Therapy 3/2023

Open Access 15-04-2023 | Multiple Sclerosis | ORIGINAL RESEARCH

Efficacy of Dimethyl Fumarate in Young Adults with Relapsing-Remitting Multiple Sclerosis: Analysis of the DEFINE, CONFIRM, and ENDORSE Studies

Authors: Lilyana Amezcua, Yang Mao-Draayer, Wendy S. Vargas, Rebecca Farber, Sara Schaefer, Filipe Branco, Sarah M. England, Nicholas Belviso, James B. Lewin, Jason P. Mendoza, Sai L. Shankar, the ENDORSE Study Investigators

Published in: Neurology and Therapy | Issue 3/2023

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Abstract

Introduction

Dimethyl fumarate (DMF) showed favorable benefit-risk in patients with relapsing-remitting multiple sclerosis (MS) in phase 3 DEFINE and CONFIRM trials and in the ENDORSE extension study. Disease activity can differ in younger patients with MS compared with the overall population.

Methods

Randomized patients received DMF 240 mg twice daily or placebo (PBO; years 0–2 DEFINE/CONFIRM), then DMF (years 3–10; continuous DMF/DMF or PBO/DMF; ENDORSE); maximum follow-up (combined studies) was 13 years. This integrated post hoc analysis evaluated safety and efficacy of DMF in a subgroup of young adults aged 18–29 years.

Results

Of 1736 patients enrolled in ENDORSE, 125 were young adults, 86 treated continuously with DMF (DMF/DMF) and 39 received delayed DMF (PBO/DMF) in DEFINE/CONFIRM. Most (n = 116 [93%]) young adults completed DMF treatment in DEFINE/CONFIRM. Median (range) follow-up time in ENDORSE was 6.5 (2.0–10.0) years. Young adults entering ENDORSE who had been treated with DMF in DEFINE/CONFIRM had a model-based Annualized Relapse Rate (ARR; 95% CI) of 0.24 (0.16–0.35) vs. 0.56 (0.35–0.88) in PBO patients. ARR remained low in ENDORSE: 0.07 (0.01–0.47) at years 9–10 (DMF/DMF group). At year 10 of ENDORSE, EDSS scores were low in young adults: DMF/DMF, 1.9 (1.4); PBO/DMF, 2.4 (1.6). At ~ 7 years, the proportion of young adults with no confirmed disability progresion was 81% for DMF/DMF and 72% for PBO/DMF. Patient-reported outcomes (PROs) (SF-36 and EQ-5D) generally remained stable during ENDORSE. The most common adverse events (AEs) in young adults during ENDORSE were MS relapse (n = 53 [42%]). Most AEs were mild (n = 20 [23.3%], n = 7 [17.9%]) to moderate (n = 45 [52.3%], n = 23 [59.0%]) in the DMF/DMF and PBO/DMF groups, respectively. The most common serious AE (SAE) was MS relapse (n = 19 [15%]).

Conclusion

The data support a favorable benefit-risk profile of DMF in young adults, as evidenced by well-characterized safety, sustained efficacy, and stable PROs.

Clinical Trial Information

Clinical trials.gov, DEFINE (NCT00420212), CONFIRM (NCT00451451), and ENDORSE (NCT00835770).
Appendix
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Literature
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Metadata
Title
Efficacy of Dimethyl Fumarate in Young Adults with Relapsing-Remitting Multiple Sclerosis: Analysis of the DEFINE, CONFIRM, and ENDORSE Studies
Authors
Lilyana Amezcua
Yang Mao-Draayer
Wendy S. Vargas
Rebecca Farber
Sara Schaefer
Filipe Branco
Sarah M. England
Nicholas Belviso
James B. Lewin
Jason P. Mendoza
Sai L. Shankar
the ENDORSE Study Investigators
Publication date
15-04-2023
Publisher
Springer Healthcare
Published in
Neurology and Therapy / Issue 3/2023
Print ISSN: 2193-8253
Electronic ISSN: 2193-6536
DOI
https://doi.org/10.1007/s40120-023-00475-8

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