Impact of long-term elosulfase alfa treatment on clinical and patient-reported outcomes in patients with mucopolysaccharidosis type IVA: results from a Managed Access Agreement in England
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Published:2021-01-21
Issue:1
Volume:16
Page:
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ISSN:1750-1172
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Container-title:Orphanet Journal of Rare Diseases
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language:en
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Short-container-title:Orphanet J Rare Dis
Author:
Cleary MaureenORCID, Davison James, Gould Rachel, Geberhiwot Tarekegn, Hughes Derralynn, Mercer Jean, Morrison Alexandra, Murphy Elaine, Santra Saikat, Jarrett James, Mukherjee Swati, Stepien Karolina M.
Abstract
Abstract
Background
We present baseline characteristics and follow-up data of a Managed Access Agreement (MAA), including patients with mucopolysaccharidosis IVA (MPS IVA) receiving elosulfase alfa enzyme replacement therapy (ERT) in England on a conditional basis. Patients enrolled in the MAA programme are reviewed on an annual basis. Therapy can be continued if patients are compliant, able to tolerate infusions, and meet four out of five pre-defined clinical and patient-reported outcomes (PRO) criteria. Baseline and follow-up clinical and PRO data are presented for all participants who completed ≥ 1 year of assessments in the MAA.
Results
The analysis included data from 55 patients, including 26 patients previously enrolled in clinical trials and 29 who started ERT after enrolling in the MAA. In patients with both baseline and follow-up data, mean 6-min walk test distance increased from 217 m at baseline to 244 m after a mean follow-up of 4.9 years. Improvement or stabilisation was seen regardless of age at treatment initiation or duration of treatment. Mean forced vital capacity and forced expiratory volume in 1 s were 0.87 L and 0.78 L, respectively at baseline and 1.05 L and 0.88 L after a mean follow-up of 5.5 years. PRO data showed overall improvements over time in Mobility, Self-care, and Caregiver assistance scores of the MPS-Health Assessment Questionnaire, relatively stable quality of life, and some improvements in pain scores.
Conclusions
The MAA data confirm the effects of elosulfase alfa on clinical and PRO results observed in the clinical trials and provide real-world evidence for long-term stabilisation in these measures, suggesting a positive impact on the natural history of MPS IVA.
Funder
BioMarin Pharmaceutical
Publisher
Springer Science and Business Media LLC
Subject
Pharmacology (medical),Genetics (clinical),General Medicine
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