• Florian Eichler, Christine N Duncan, Patricia L Musolino, Troy C Lund, Ashish O Gupta, Satiro De Oliveira, Adrian J Thrasher, Patrick Aubourg, Jörn-Sven Kühl, Daniel J Loes, Hernan Amartino, Nicholas Smith, Juliana Folloni Fernandes, Caroline Sevin, Raman Sankar, Shaun A Hussain, Paul Gissen, Jean-Hugues Dalle, Uwe Platzbecker, Gerald F Downey, Elizabeth McNeil, Laura Demopoulos, Andrew C Dietz, Himal L Thakar, Paul J Orchard, and David A Williams.
• From Massachusetts General Hospital and Harvard Medical School (F.E., P.L.M.) and Dana-Farber/Boston Children's Cancer and Blood Disorders Center, Harvard Medical School (C.N.D., D.A.W.), Boston, Bluebird Bio, Somerville (G.F.D., L.D., A.C.D., H.L.T.), and McNeil Pediatrics Consultancy, Sudbury (E.M.) - all in Massachusetts; the Division of Blood and Marrow Transplantation, Department of Pediatrics, University of Minnesota (T.C.L., A.O.G., P.J.O.), and Midwest Radiology (D.J.L.) - both in Minneapolis; David Geffen School of Medicine, University of California, Los Angeles, Los Angeles (S.D.O., R.S., S.A.H.); University College London Great Ormond Street Hospital Institute of Child Health and Great Ormond Street Hospital NHS Trust, London (A.J.T., P.G.); INSERM, Université Paris-Saclay, Hôpital Kremlin-Bicêtre (P.A.), the Reference Center for Leukodystrophies, Hôpital Kremlin-Bicêtre, Assistance Publique-Hôpitaux de Paris, Université Paris-Saclay (C.S.), and Robert-Debre Hospital, GHU Nord-Université de Paris (J.-H.D.) - all in Paris; the Departments of Pediatric Oncology/Hematology/Hemostaseology (J.-S.K.) and Hematology, Cellular Therapy, Hemostaseology and Infectious Diseases (U.P.), University Hospital Leipzig, Leipzig, Germany; Instituto Neurogenia and Hospital Universitario Austral - both in Buenos Aires (H.A.); Women's and Children's Health Network and the University of Adelaide - both in Adelaide, SA, Australia (N.S.); ITACI/Instituto da Criança-Hospital das Clínicas da Universidade de São Paulo, Sao Paulo (J.F.F.); and Shape Therapeutics, Seattle (A.C.D.).
• N. Engl. J. Med. 2024 Oct 10; 391 (14): 130213121302-1312.

BackgroundCerebral adrenoleukodystrophy is a severe form of X-linked adrenoleukodystrophy characterized by white-matter disease, loss of neurologic function, and early death. Elivaldogene autotemcel (eli-cel) gene therapy, which consists of autologous CD34+ cells transduced with Lenti-D lentiviral vector containing ABCD1 complementary DNA, is being tested in persons with cerebral adrenoleukodystrophy.MethodsIn a phase 2-3 study, we evaluated the efficacy and safety of eli-cel therapy in boys with early-stage cerebral adrenoleukodystrophy and evidence of active inflammation on magnetic resonance imaging (MRI). The primary efficacy end point was survival without any of six major functional disabilities at month 24. The secondary end points included overall survival at month 24 and the change from baseline to month 24 in the total neurologic function score.ResultsA total of 32 patients received eli-cel; 29 patients (91%) completed the 24-month study and are being monitored in the long-term follow-up study. At month 24, none of these 29 patients had major functional disabilities; overall survival was 94%. At the most recent assessment (median follow-up, 6 years), the neurologic function score was stable as compared with the baseline score in 30 of 32 patients (94%); 26 patients (81%) had no major functional disabilities. Four patients had adverse events that were directly related to eli-cel. Myelodysplastic syndrome (MDS) with excess blasts developed in 1 patient at month 92; the patient underwent allogeneic hematopoietic stem-cell transplantation and did not have MDS at the most recent follow-up.ConclusionsAt a median follow-up of 6 years after lentiviral gene therapy, most patients with early cerebral adrenoleukodystrophy and MRI abnormalities had no major functional disabilities. However, insertional oncogenesis is an ongoing risk associated with the integration of viral vectors. (Funded by Bluebird Bio; ALD-102 and LTF-304 ClinicalTrials.gov numbers NCT01896102 and NCT02698579, respectively.).Copyright © 2024 Massachusetts Medical Society.

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