Life-Saving Treatments for Spinal Muscular Atrophy: Global Access and Availability.

Background and Objectives

Spinal muscular atrophy (SMA) is a neurodegenerative disorder manifesting with progressive muscle weakness and atrophy. SMA type 1 used to be fatal within the first 2 years of life, but is now treatable with therapies targeting splicing modification and gene replacement. Nusinersen, risdiplam, and onasemnogene abeparvovec-xioi improve survival, motor strength, endurance, and ability to thrive, allowing many patients to potentially attain a normal life; all have been recently approved by major regulatory agencies. Although these therapies have revolutionized the world of SMA, they are associated with a high economic burden, and access to these therapies is limited in some countries. The primary objective of this study was to compare the availability and implementation of treatment of SMA from different regions of the world.

Methods

In this qualitative study, we surveyed health care providers from 21 countries regarding their experiences caring for patients with SMA. The main outcome measures were provider survey responses on newborn screening, drug availability/access, barriers to treatment, and related questions.

Results

Twenty-four providers from 21 countries with decades of experience (mean 26 years) in treating patients with SMA responded to the survey. Nusinersen was the most available therapy for SMA. Our survey showed that while genetic testing is usually available, newborn screening is still unavailable in many countries. The provider-reported treatment cost also varied between countries, and economic burden was a major barrier in treating patients with SMA.

Discussion

Overall, this survey highlights the global inequality in managing patients with SMA. The spread of newborn screening is essential in ensuring improved access to care for patients with SMA. With the advancement of neurotherapeutics, more genetic diseases will soon be treatable, and addressing the global inequality in clinical care will require novel approaches to mitigate such inequality in the future.

Informations de copyright

© 2023 American Academy of Neurology.

Déclaration de conflit d'intérêts

V.D. Armengol reports no disclosures relevant to the manuscript; B.T. Darras reports grants and non-financial support from, and being the FIREFISH Study Steering Committee Chair and an ad hoc scientific advisory board member for Roche/Genentech, which manufactures risdiplam, grant support from and being an ad hoc scientific board member for Biogen, which manufactures nusinersen; non-financial support from and being an ad hoc scientific board member for Novartis Gene Therapies (AveXis), which manufactures onasemnogene abeparvovec, grant support for the ENDEAR, CHERISH, and CS2/CS12 studies from Ionis Pharmaceuticals, grants from and being an ad hoc scientific board member for Sarepta Pharmaceuticals, grants from PTC Therapeutics, Fibrogen, Summit, the US NIH and National Institute of Neurological Disorders and Stroke, Slaney Family Fund for SMA, Spinal Muscular Atrophy Foundation, CureSMA, and Working on Walking Fund, being an ad hoc scientific board member for Vertex, and a data and safety monitoring board member for Amicus Inc; A.A. Abulaban reports no disclosures relevant to the manuscript; A. Alshehri reports no disclosures relevant to the manuscript; N. Barišić is investigator for Roche clinical trials, served as advisor or consultant, speaker or member of Advisory Boards for: Roche, Novartis, PTC, and Biogen/Medis-Adria; T. Ben-Omran reports no disclosures relevant to the manuscript; G. Bernert has served on Advisory boards for Avexis/Novartis Gene Therapies, Biogen, PTC, Roche, Pfizer and Santhera, he has received funding for travel or speaker honoraria for Biogen, Novartis, Pfizer, PTC, Roche, Santhera, and Merz, he has served as PI for DELOS, SIDEROS (SANTHERA), LELANTOS 1 + 2 (Fibrogen), and STRIDE Registry (PTC); C. Castiglioni has participated in advisory and educational activities by Biogen, Roche and Novartis and received honoraria for these activities; Y.H. Chien has served on advisory boards for Biogen and Novartis Gene Therapies and received honoraria for educational activities; M.A. Farrar is funded by a National Health and Medical Research Council of Australia Investigator grant (APP1194940), she has served on advisory boards for Biogen, Roche and Novartis Gene Therapies and received honoraria for educational activities; G. Kandawasvika reports no disclosures relevant to the manuscript; S. Khadilkar reports no disclosures relevant to the manuscript; J.K. Mah received research grants as PI in studies sponsored by Biogen, Roche, and the Alberta Children's Hospital Foundation; C. Marini-Bettolo reports participation in Scientific Advisory boards and teaching initiatives for Avexis, Biogen, and Roche, she is involved as an investigator in clinical trials from Avexis, and she is principal investigator for the UK SMA patient registry funded by SMA UK; D. Osredkar reports participation in scientific advisory boards and teaching initiatives for Biogen, Medis, Novartis Gene Therapies, PTC, Roche, and Serapta, and he is PI in studies sponsored partly by Biogen and PTC; G. Pfeffer reports no disclosures relevant to the manuscript; F. Piazzon reports no disclosures relevant to the manuscript; I. Pitarch-Castellano has participated in advisory and educational activities by Biogen, Roche and Novartis; S. Quijano-Roy is PI for clinical trials of Biogen (DEVOTE), Novartis Gene Therapies (SMART), and Roche (OLEOS), has served on advisory boards for Biogen, Novartis GT and Roche, and has received travel and speaker honoraria from Biogen Novartis and Roche; K. Saito is funded by the Practical Research Project for Rare/Intractable Diseases of the Japan Agency for Medical Research and Development, AMED (grant number: 22ek0109472h0003), and she is Principal Investigator for clinical trials of Biogen (DEVOTE), Novartis Gene Therapies, Inc./Novartis (SPR1NT, LT-002), and Chugai (Roche) (SUNFISH), has served on advisory boards for Biogen, Novartis Gene Therapies, Inc./Novartis, and Chugai (Roche), and has received honoraria from Biogen, Novartis and Chugai; J.H. Shin reports no disclosures relevant to the manuscript; J.F. Vázquez-Costa is funded by grants of the Instituto de Salud Carlos III (JR19/00030, PI Vázquez), served on advisory boards for Biogen and Roche and received travel and speaker honoraria from Biogen and Roche; M.C. Walter has served on advisory boards for Avexis, Biogen, Novartis, Roche, Santhera, Sarepta, PTC Therapeutics, Ultragenyx, Wave Sciences, received funding for Travel or Speaker Honoraria from Novartis, Biogen, Ultragenyx, Santhera, PTC Therapeutics, and worked as an ad hoc consultant for AskBio, Audentes Therapeutics, Biogen Pharma GmbH, Fulcrum Therapeutics, Novartis, PTC Therapeutics, Roche; J. Wanigasinghe receives support as principal investigator from NIH grant 1R21HD093563-01; H. Xiong is one of the investigators of Biogen (DEVOTE), Roche (FIREFISH, SUNFISH) and Novartis (STEER), but has no conflicts of interest related to this study; R.C. Griggs serves as Co-PI of a training grant from the NINDS for the Experimental Therapeutics of Neurological Diseases. He receives grant funding from the NIH, the Muscular Dystrophy Association, and the Parent Project for Muscular Dystrophy in support of clinical trials, and he also receives support from PTC Therapeutics, Sarepta Pharmaceuticals and Santhera Pharmaceutics for clinical trial data, and he serves as Chair of a DSMB for Solid Pharmaceuticals, Chair of the Research Advisory Committee of the American Brain Foundation, inaugural Chair of the American Academy of Neurology Section on Experimental Neurotherapeutics, and he receives compensation as an Editor of Cecil Textbook of Medicine; B. Roy has served as a consultant for Alexion Pharmaceuticals (now part of AstraZeneca), Takeda Pharmaceuticals, and argenx, but he has no conflicts directly related to this work. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp. TAKE-HOME POINTS → Stark global disparities in access to disease-modifying therapy (DMT) for spinal muscular atrophy (SMA) currently exist, and these disparities are not driven simply by differences in countries' wealth.→ The economic burden of DMT was identified by a majority of survey respondents as a barrier to treatment of SMA, with several other barriers also noted.→ Most respondents reported access to genetic testing, but newborn screening is unavailable in several countries included in this survey and is only implemented regionally in others.→ Increased awareness of unequal access to treatment is the first step toward mitigating inequities in rare neurologic diseases.