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Safety of Onasemnogene Abeparvovec for Patients With Spinal Muscular Atrophy 8.5 kg or Heavier in a Global Managed Access Program. | LitMetric

AI Article Synopsis

  • Spinal muscular atrophy is a rare disorder linked to mutations in the SMN1 gene, and onasemnogene abeparvovec is a gene therapy that has expanded access through the Global Managed Access Program (GMAP) for children over 8.5 kg who couldn't previously receive treatment.
  • A review revealed that 102 children in GMAP met the weight criteria, with over half experiencing adverse events (AEs) after treatment, including some serious outcomes linked to respiratory issues.
  • Common AEs reported included liver function abnormalities, low platelet counts, fever, vomiting, and decreased appetite, aligning with safety results from previous clinical trials.

Article Abstract

Background: Spinal muscular atrophy is a rare, neurodegenerative disorder caused by biallelic deletions in the survival motor neuron (SMN1) gene. Onasemnogene abeparvovec is a one-time, intravenous gene replacement therapy designed to deliver the SMN1 transgene. Although available in many geographies, it is not approved globally. The Global Managed Access Program (GMAP) expanded treatment access to patients in countries where treatment was not approved. Previous onasemnogene abeparvovec clinical trials included patients with body weight <8.5 kg. Through GMAP, children weighing ≥8.5 kg received onasemnogene abeparvovec. We describe safety data for heavier patients in GMAP.

Methods: GMAP records were reviewed to identify patients weighing ≥8.5 kg at onasemnogene abeparvovec dosing. To obtain corresponding adverse event (AE) data, the Novartis ARGUS safety database was searched using patient identification numbers and birth dates/dosing dates for any reported AE for GMAP patients.

Results: As of September 2, 2021, 102 patients weighing ≥8.5 kg at time of dosing were identified. Fifty-four (53%) had one or more reported AEs. Three patients were reported to be deceased. All three deaths were assessed to be secondary to acute respiratory events. Most (62%) AEs were non-serious. The most frequently reported AEs included increases in hepatic laboratory values, decreased platelets and thrombocytopenia, pyrexia, vomiting, and decreased appetite.

Conclusions: Safety findings for patients weighing ≥8.5 kg administered onasemnogene abeparvovec through GMAP were consistent with those described in clinical trials and included hepatotoxicity, thrombotic microangiopathy, and thrombocytopenia.

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Source
http://dx.doi.org/10.1016/j.pediatrneurol.2022.05.001DOI Listing

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