Spinal muscular atrophy.

Spinal muscular atrophy (SMA) is an autosomal recessive motor neuron disease caused by deletion or mutation of SMN1. Four subtypes exist, characterized by different clinical severities. New therapeutic approaches have become available in the past few years, dramatically changing the natural history of all SMA subtypes, including substantial clinical improvement with the severe and advanced SMA type 1 variant. Trials have now demonstrated that phenotypic rescue is even more dramatic when pre-symptomatic patients are treated, and emerging real-world data are demonstrating the benefits of intervention even in the chronic phase of the condition. Here, we critically review how the field is rapidly evolving in response to the new therapies and questions that the new treatments have posed, including the effects of treatment at different ages and stages of disease, new phenotypes and long-term outcomes in patients who would not have survived without treatment, and decisions of who to treat and when. We also discuss how the outcomes associated with different timing of therapeutic intervention are contributing to our understanding of the biology and pathogenesis of SMA.

Spinal muscular atrophy — insights and challenges in the treatment era

Background There is an increasing number of papers reporting the real world use of Nusinersen in different cohorts of SMA patients. Main body The aim of this paper was to critically review the literature reporting real world data on motor function in type 2 and 3 patients treated with Nusinersen, subdividing the results according to SMA type, age and type of assessment and performing a meta-analysis of the available results. We also report the available data collected in untreated patients using the same measures. Of the 400 papers identified searching for Nusinersen and spinal muscular atrophy, 19 reported motor function in types 2 and 3: 13 in adults, 4 in children and 2 included both. Twelve papers reported untreated patients' data. All studies reported positive changes on at least one of the functional measures and at every time point while all-untreated cohorts showed negative changes. Conclusion Our review suggests that Nusinersen provides a favorable benefit in motor function across a wide range of SMA type 2 and 3 patients over a 10-14 month observation period. Although a direct comparison with studies reporting data from untreated patients cannot be made, the longitudinal changes in the treated cohorts (consistently positive) are divergent from those observed in the untreated cohorts (consistently negative). The difference could be observed both in the global cohorts and in smaller groups subdivided according to age, type or functional status.

/pdf/motor-function-in-type-2-and-3-sma-patients-treated-with-1pxdzggg9a.pdf

Motor function in type 2 and 3 SMA patients treated with Nusinersen: a critical review and meta-analysis.

5q-associated spinal muscular atrophy (SMA) is a rare neuromuscular disorder with the leading symptom of a proximal muscle weakness. Three different drugs have been approved by EMA and FDA for the treatment of SMA patients, however long-term experience is still scarce. In contrast to clinical trial data with restricted patient populations and short observation periods, we here report real-world evidence on a broad spectrum of patients with early-onset SMA treated with nusinersen focusing on effects regarding motor milestones, and respiratory and bulbar insufficiency during the first years of treatment. Within the SMArtCARE registry, all patients under treatment with nusinersen who never had the ability to sit independently before start of treatment were identified for data analysis. Primary outcome of this analysis was the change in motor function evaluated with the CHOP INTEND score and motor milestones considering WHO criteria. Further, we evaluated data on the need for ventilator support and tube feeding, and mortality. In total, 143 patients with early-onset SMA were included in the data analysis with a follow-up period of up to 38 months. We observed major improvements in motor function evaluated with the CHOP INTEND score. Improvements were greater in children less than two years of age at start of treatment than in older children. 24.5% of children gained the ability to sit independently. Major improvements were observed during the first 14 months of treatment. The need for intermittent ventilator support and tube feeding increased despite treatment with nusinersen. Our findings confirm the increasing real-world evidence that treatment with nusinersen has a dramatic influence on disease progression and survival in patients with early-onset SMA. Major improvements in motor function are seen in children younger than two years at start of treatment. Bulbar and respiratory function needs to be closely monitored, as these functions do not improve equivalent to motor function.

Effect of nusinersen on motor, respiratory and bulbar function in early-onset spinal muscular atrophy.

Abstract The natural history of spinal muscular atrophy has been radically changed by the advent of improved standards of care and the availability of disease-modifying therapies. The aim of this paper is to provide the current therapeutic scenario including new perspectives and to report the challenges related to new phenotypes a few years after the therapies have become available. The paper also includes a review of real-world data that provides information on safety and efficacy in individuals that were not included in clinical trials. Special attention is paid to future perspectives both in terms of new drugs that are currently investigated in clinical trials or providing details on current developments in the use of the available drugs, including combination therapies or new modalities of dose or administration. Conclusion : Clinical trials and real world data support the efficacy and safety profiles of the available drugs. At the moment there is not enough published evidence about the superiority of one product compared to the others. What is Known: • Safety and efficacy results of clinical trials have led in the last 6 years to the marketing of three drugs for spinal muscular atrophy, with different mechanisms of action. What is New: • Since the drug’s approval, real-world data allow us to have data on bigger and heterogeneous groups of patients in contrast with those included in clinical trials. • In addition to the new molecules, combinations of therapies are currently being evaluated. 

/pdf/new-therapies-for-spinal-muscular-atrophy-where-we-stand-and-1qli8veg.pdf

New therapies for spinal muscular atrophy: where we stand and what is next

The natural history of patients with spinal muscular atrophy (SMA) has changed due to advances in standard care and development of targeted treatments. Nusinersen was the first drug approved for the treatment of all SMA patients. The transfer of clinical trial data into a real-life environment is challenging, especially regarding the advice of patients and families to what extent they can expect a benefit from the novel treatment. We report the results of a modified Delphi consensus process among child neurologists from Germany, Austria and Switzerland about the indication or continuation of nusinersen treatment in children with SMA type 1 based on different clinical case scenarios.

Treatment with Nusinersen - Challenges Regarding the Indication for Children with SMA Type 1.

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Treatment with Nusinersen - Challenges Regarding the Indication for Children with SMA Type 1.