Vertex Pharmaceuticals IncFDA approval of Casgevy for younger children expands market and revenue potential.

The U.S. Food and Drug Administration has approved Casgevy, a gene therapy, for patients aged 2 years and older with sickle cell disease with recurrent vaso-occlusive crises or transfusion-dependent β thalassemia, marking the first gene therapy available for this younger age group. Previously approved only for those 12 and older, the expanded indication was supported by clinical trials in patients aged 5 to less than 12 years, where all eight evaluable sickle cell patients achieved the primary efficacy outcome of VF12, meaning no severe vaso-occlusive crises for at least 12 consecutive months within 24 months post-infusion. In a separate trial for transfusion-dependent β thalassemia, eight of nine evaluable patients achieved transfusion independence for 12 consecutive months, with a median duration of 20.1 months. The approval, granted to Vertex Pharmaceuticals, was issued just 53 days after filing under the Commissioner's National Priority Voucher pilot program, and the therapy carries warnings for risks including neutrophil engraftment failure and off-target genome editing.
Vertex Pharmaceuticals IncFDA approval of Casgevy for younger children expands market and revenue potential.