Lentiviral globin gene therapy with reduced-intensity conditioning in adults with ß-thalassemia: a phase 1 trial.
Nat Med
; 28(1): 63-70, 2022 01.
Article
em En
| MEDLINE
| ID: mdl-34980909
ABSTRACT
ß-Thalassemias are inherited anemias that are caused by the absent or insufficient production of the ß chain of hemoglobin. Here we report 6-8-year follow-up of four adult patients with transfusion-dependent ß-thalassemia who were infused with autologous CD34+ cells transduced with the TNS9.3.55 lentiviral globin vector after reduced-intensity conditioning (RIC) in a phase 1 clinical trial ( NCT01639690) . Patients were monitored for insertional mutagenesis and the generation of a replication-competent lentivirus (safety and tolerability of the infusion product after RIC-primary endpoint) and engraftment of genetically modified autologous CD34+ cells, expression of the transduced ß-globin gene and post-transplant transfusion requirements (efficacy-secondary endpoint). No unexpected safety issues occurred during conditioning and cell product infusion. Hematopoietic gene marking was very stable but low, reducing transfusion requirements in two patients, albeit not achieving transfusion independence. Our findings suggest that non-myeloablative conditioning can achieve durable stem cell engraftment but underscore a minimum CD34+ cell transduction requirement for effective therapy. Moderate clonal expansions were associated with integrations near cancer-related genes, suggestive of non-erythroid activity of globin vectors in stem/progenitor cells. These correlative findings highlight the necessity of cautiously monitoring patients harboring globin vectors.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Globinas
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Terapia Genética
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Talassemia beta
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Lentivirus
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Condicionamento Pré-Transplante
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Vetores Genéticos
Limite:
Adolescent
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Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Nat Med
Assunto da revista:
BIOLOGIA MOLECULAR
/
MEDICINA
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Estados Unidos