FDA Narrows Skysona Access as Post-Marketing Data Shows Elevated Cancer Risk
SHERIDAN, WYOMING – August 12, 2025 – The U.S. Food and Drug Administration (FDA) has significantly tightened prescribing criteria for bluebird bio’s Skysona, an autologous hematopoietic stem cell-based gene therapy for cerebral adrenoleukodystrophy (CALD). The treatment is now limited to patients with no other therapeutic options or available stem cell donors, following post-marketing findings of a substantially higher incidence of hematologic malignancies than previously reported.