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- Title
FDA orphan drug designations for lysosomal storage disorders – a cross-sectional analysis.
- Authors
Garbade, Sven F.; Zielonka, Matthias; Mechler, Konstantin; Kölker, Stefan; Hoffmann, Georg F.; Staufner, Christian; Mengel, Eugen; Ries, Markus
- Abstract
Purpose: To provide a quantitative clinical-regulatory insight into the status of FDA orphan drug designations for compounds intended to treat lysosomal storage disorders (LSDs). Methods: Assessment of the drug pipeline through analysis of the FDA database for orphan drug designations with descriptive and comparative statistics. Results: Between 1983 and 2019, 124 orphan drug designations were granted by the FDA for compounds intended to treat 28 lysosomal storage diseases. Orphan drug designations focused on Gaucher disease (N = 16), Pompe disease (N = 16), Fabry disease (N = 10), MPS II (N = 10), MPS I (N = 9), and MPS IIIA (N = 9), and included enzyme replacement therapies, gene therapies, and small molecules, and others. Twenty-three orphan drugs were approved for the treatment of 11 LSDs. Gaucher disease (N = 6), cystinosis (N = 5), Pompe disease (N = 3), and Fabry disease (N = 2) had multiple approvals, CLN2, LAL-D, MPS I, II, IVA, VI, and VII one approval each. This is an increase of nine more approved drugs and four more treatable LSDs (CLN2, MPS VII, LAL-D, and MPS IVA) since 2013. Mean time between orphan drug designation and FDA approval was 89.7 SD 55.00 (range 8–203, N = 23) months. Conclusions: The drug development pipeline for LSDs is growing and evolving, with increased focus on diverse small-molecule targets and gene therapy. CLN2 was the first and only LSD with an approved therapy directly targeted to the brain. Newly approved products included "me-too"–enzymes and innovative compounds such as the first pharmacological chaperone for the treatment of Fabry disease.
- Subjects
UNITED States. Food &; Drug Administration; LYSOSOMAL storage diseases; ORPHAN drugs; ANGIOKERATOMA corporis diffusum; ERGOT alkaloids; CROSS-sectional method; MOLECULAR chaperones
- Publication
PLoS ONE, 2020, Vol 15, Issue 4, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0230898