Cited by 1,273Hemophilia Treatment and ResearchVirus-based gene therapy researchRNA Interference and Gene Delivery

Long-Term Safety and Efficacy of Factor IX Gene Therapy in Hemophilia B

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Nathwani, Amit C., Reiss, Ulreke M., Tuddenham, Edward G.D., Rosales, Cecilia, Chowdary, Pratima, McIntosh, Jenny, Della Peruta, Marco, Lheriteau, Elsa +22 more·2014·New England Journal of Medicine

Abstract

BACKGROUND: In patients with severe hemophilia B, gene therapy that is mediated by a novel self-complementary adeno-associated virus serotype 8 (AAV8) vector has been shown to raise factor IX levels for periods of up to 16 months. We wanted to determine the durability of transgene expression, the vector dose-response relationship, and the level of persistent or late toxicity. METHODS: We evaluated the stability of transgene expression and long-term safety in 10 patients with severe hemophilia B: 6 patients who had been enrolled in an initial phase 1 dose-escalation trial, with 2 patients each receiving a low, intermediate, or high dose, and 4 additional patients who received the high dose (2×10(12) vector genomes per kilogram of body weight). The patients subsequently underwent extensive clinical and laboratory monitoring. RESULTS: A single intravenous infusion of vector in all 10 patients with severe hemophilia B resulted in a dose-dependent increase in circulating factor IX to a level that was 1 to 6% of the normal value over a median period of 3.2 years, with observation ongoing. In the high-dose group, a consistent increase in the factor IX level to a mean (±SD) of 5.1±1.7% was observed in all 6 patients, which resulted in a reduction of more than 90% in both bleeding episodes and the use of prophylactic factor IX concentrate. A transient increase in the mean alanine aminotransferase level to 86 IU per liter (range, 36 to 202) occurred between week 7 and week 10 in 4 of the 6 patients in the high-dose group but resolved over a median of 5 days (range, 2 to 35) after prednisolone treatment. CONCLUSIONS: In 10 patients with severe hemophilia B, the infusion of a single dose of AAV8 vector resulted in long-term therapeutic factor IX expression associated with clinical improvement. With a follow-up period of up to 3 years, no late toxic effects from the therapy were reported. (Funded by the National Heart, Lung, and Blood Institute and others; ClinicalTrials.gov number, NCT00979238.).

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Authors
Nathwani, A. C., Reiss, U. M., Tuddenham, E. G. D., Rosales, C., Chowdary, P., McIntosh, J., Della Peruta, M., Lheriteau, E., Patel, N., Raj, D., Riddell, A., Pie, J., Rangarajan, S., Bevan, D., Recht, M., Shen, Y.-M., Halka, K. G., Basner-Tschakarjan, E., Mingozzi, F., High, K. A., Allay, J., Kay, M. A., Ng, C. Y. C., Zhou, J., Cancio, M., Morton, C. L., Gray, J. T., Srivastava, D., Nienhuis, A. W., & Davidoff, A. M.
Affiliations
  • NHS Blood and Transplant (GB)
  • Royal Free London NHS Foundation Trust (GB)
  • University College London (GB)
  • St Thomas' Hospital (GB)
  • Oregon Health & Science University (US)
  • The University of Texas Southwestern Medical Center (US)
  • Children's Hospital of Philadelphia (US)
  • St. Jude Children's Research Hospital (US)
  • Stanford Medicine (US)
Venue
New England Journal of Medicine
Published
2014-11-20
Volume
371
Issue
21
Pages
1994-2004
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W1969271703
Cited by
1,273
References
17
Citations by year
2026: 44 · 2025: 64 · 2024: 80 · 2023: 99 · 2022: 118 · 2021: 119 · 2020: 133 · 2019: 125 · 2018: 139 · 2017: 144 · 2016: 108 · 2015: 92 · 2014: 2 · 2013: 4
FWCI
81.02
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • HAL (submittedVersion)
  • ePrints Soton (University of Southampton) (submittedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • Assisi Foundation of Memphis
  • NHS Blood and Transplant
  • American Lebanese Syrian Associated Charities
  • National Institute for Health and Care Research (RP-PG-0310-1001, NF-SI-0513-10071)
  • University College London
  • University College London Hospitals NHS Foundation Trust
  • Medical Research Council
  • National Heart, Lung, and Blood Institute (HL094396, R01HL094396, R01HL073838, R01HL064274)
  • National Cancer Institute (P30CA021765)
Topics
  • Health Sciences › Medicine › Hematology › Hemophilia Treatment and Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
hemophilia B, AAV8 vector, self-complementary AAV, dose-response relationship, long-term safety, late toxicity, alanine aminotransferase elevation, bleeding events
MeSH terms
Dependovirus, Adult, Alanine Transaminase, Hemophilia B, Factor IX, Follow-Up Studies, Genetic Vectors, Humans, Infusions, Intravenous, Male, Middle Aged, Genetic Therapy, Gene Expression, Transgenes, Young Adult

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