Exagamglogene autotemcel (Casgevy – Vertex), a cell-based gene therapy recently approved for treatment of sickle cell disease1, has now been approved by the FDA for treatment of patients ≥12 years old with transfusion-dependent beta thalassemia. Casgevy is the first gene therapy that uses CRISPR/Cas9 gene-editing technology to be approved in the US for any disorder. Betibeglogene autotemcel (Zynteglo), an autologous lentiviral vector cell-based gene therapy, was approved in the US in 2022 for treatment of transfusion-dependent beta thalassemia.

Two cell-based gene therapies – exagamglogene autotemcel (Casgevy – Vertex) and lovotibeglogene autotemcel (Lyfgenia – Bluebird Bio) – have been approved by the FDA for treatment of sickle cell disease in patients ≥12 years old with recurrent vaso-occlusive crises. They are the first gene therapies to be approved in the US for use in sickle cell disease; Casgevy is the first treatment to be approved in the US that uses CRISPR/Cas9 gene-editing technology.