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Pharmacological Approaches to the Management of Secondary Progressive Multiple Sclerosis

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Abstract

It is well recognised that the majority of the impact of multiple sclerosis (MS), both personal and societal, arises in the progressive phase where disability accumulates inexorably. As such, progressive MS (PMS) has been the target of pharmacological therapies for many years. However, there are no current licensed treatments for PMS. This stands in marked contrast to relapsing remitting MS (RRMS) where trials have resulted in numerous licensed therapies. PMS has proven to be a more difficult challenge compared to RRMS and this review focuses on secondary progressive MS (SPMS), where relapses occur before the onset of gradual, irreversible disability, and not primary progressive MS where disability accumulation occurs without prior relapses. Although there are similarities between the two forms, in both cases pinpointing when PMS starts is difficult in a condition in which disability can vary from day to day. There is also an overlap between the pathology of relapsing and progressive MS and this has contributed to the lack of well-defined outcomes, both surrogates and clinically relevant outcomes in PMS. In this review, we used the search term ‘randomised controlled clinical drug trials in secondary progressive MS’ in publications since 1988 together with recently completed trials where results were available. We found 34 trials involving 21 different molecules, of which 38% were successful in reaching their primary outcome. In general, the trials were well designed (e.g. double blind) with sample sizes ranging from 35 to 1949 subjects. The majority were parallel group, but there were also multi-arm and multidose trials as well as the more recent use of adaptive designs. The disability outcome most commonly used was the Expanded Disability Status Scale (EDSS) in all phases, but also magnetic resonance imaging (MRI)-measured brain atrophy has been utilised as a surrogate endpoint in phase II studies. The majority of the treatments tested in SPMS over the years were initially successful in RRMS. This has a number of implications in terms of targeting SPMS, but principally implies that the optimal strategy to target SPMS is to utilise the prodrome of relapses to initiate a therapy that will aim to both prevent progression and slow its accumulation. This approach is in agreement with the early targeting of MS but requires treatments that are both effective and safe if it is to be used before disability is a major problem. Recent successes will hopefully result in the first licensed therapy for PMS and enable us to test this approach.

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Authors and Affiliations

  1. Wolfson Neuroscience Laboratories, Faculty of Medicine, Imperial College London, Hammersmith Hospital Campus, 160 Du Cane Road, London, W12 0NN, UK

    A. Nandoskar, J. Raffel, A. S. Scalfari & R. S. Nicholas

  2. Department of Medical Statistics, University Medical Center Göttingen, Humboltallee 32, 37073, Göttingen, Germany

    T. Friede

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  1. A. Nandoskar
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  2. J. Raffel
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Correspondence to R. S. Nicholas.

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Conflict of interest

Dr. Ashwini Nandoskar has no conflicts of interest.

Dr. Joel Raffel has no conflicts of interest.

Dr. Antonio Scalfari has received honoraria for speaking (Teva and Genzyme) and support for attending conferences (Biogen, Teva, Genzyme, Novartis).

Professor Tim Friede has received personal fees for consultancies (including data monitoring committees) from Novartis, Bayer, Biogen, AstraZeneca, Janssen, Grünenthal, Pharmalog, SGS and Roche, all outside the submitted work.

Richard Nicholas has received an honorarium for advisory boards (Biogen Idec, Roche, Novartis, Genzyme), speaking (Biogen Idec, Novartis, Genzyme), funds for organising education (Biogen Idec, Genzyme), and for staff/research (Biogen). He has been a principal investigator in RRMS (Biogen, Novartis) and progressive MS (dirucotide, simvastatin, dronabinol, natalizumab, siponimod, MS-SMART) trials.

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Nandoskar, A., Raffel, J., Scalfari, A.S. et al. Pharmacological Approaches to the Management of Secondary Progressive Multiple Sclerosis. Drugs 77, 885–910 (2017). https://doi.org/10.1007/s40265-017-0726-0

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