Phase 1-2 Trial of AAVS3 Gene Therapy in Patients with Hemophilia B.
Journal
The New England journal of medicine
ISSN: 1533-4406
Titre abrégé: N Engl J Med
Pays: United States
ID NLM: 0255562
Informations de publication
Date de publication:
21 07 2022
21 07 2022
Historique:
entrez:
20
7
2022
pubmed:
21
7
2022
medline:
23
7
2022
Statut:
ppublish
Résumé
FLT180a (verbrinacogene setparvovec) is a liver-directed adeno-associated virus (AAV) gene therapy that uses a synthetic capsid and a gain-of-function protein to normalize factor IX levels in patients with hemophilia B. In this multicenter, open-label, phase 1-2 trial, we assessed the safety and efficacy of varying doses of FLT180a in patients with severe or moderately severe hemophilia B (factor IX level, ≤2% of normal value). All the patients received glucocorticoids with or without tacrolimus for immunosuppression to decrease the risk of vector-related immune responses. After 26 weeks, patients were enrolled in a long-term follow-up study. The primary end points were safety and efficacy, as assessed by factor IX levels at week 26. Ten patients received one of four FLT180a doses of vector genomes (vg) per kilogram of body weight: 3.84×10 Sustained factor IX levels in the normal range were observed with low doses of FLT180a but necessitated immunosuppression with glucocorticoids with or without tacrolimus. (Funded by Freeline Therapeutics; ClinicalTrials.gov numbers, NCT03369444 and NCT03641703; EudraCT numbers, 2017-000852-24 and 2017-005080-40.).
Sections du résumé
BACKGROUND
FLT180a (verbrinacogene setparvovec) is a liver-directed adeno-associated virus (AAV) gene therapy that uses a synthetic capsid and a gain-of-function protein to normalize factor IX levels in patients with hemophilia B.
METHODS
In this multicenter, open-label, phase 1-2 trial, we assessed the safety and efficacy of varying doses of FLT180a in patients with severe or moderately severe hemophilia B (factor IX level, ≤2% of normal value). All the patients received glucocorticoids with or without tacrolimus for immunosuppression to decrease the risk of vector-related immune responses. After 26 weeks, patients were enrolled in a long-term follow-up study. The primary end points were safety and efficacy, as assessed by factor IX levels at week 26.
RESULTS
Ten patients received one of four FLT180a doses of vector genomes (vg) per kilogram of body weight: 3.84×10
CONCLUSIONS
Sustained factor IX levels in the normal range were observed with low doses of FLT180a but necessitated immunosuppression with glucocorticoids with or without tacrolimus. (Funded by Freeline Therapeutics; ClinicalTrials.gov numbers, NCT03369444 and NCT03641703; EudraCT numbers, 2017-000852-24 and 2017-005080-40.).
Identifiants
pubmed: 35857660
doi: 10.1056/NEJMoa2119913
doi:
Substances chimiques
Glucocorticoids
0
Immunosuppressive Agents
0
Factor IX
9001-28-9
Transaminases
EC 2.6.1.-
Tacrolimus
WM0HAQ4WNM
Banques de données
ClinicalTrials.gov
['NCT03369444', 'NCT03641703']
EudraCT
['2017-000852-24', '2017-005080-40']
Types de publication
Clinical Trial, Phase I
Clinical Trial, Phase II
Journal Article
Multicenter Study
Langues
eng
Sous-ensembles de citation
IM
Pagination
237-247Subventions
Organisme : Medical Research Council
ID : MR/L013185/1
Pays : United Kingdom
Commentaires et corrections
Type : CommentIn
Informations de copyright
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