Cited by 1,864Hemophilia Treatment and ResearchVirus-based gene therapy researchRNA Interference and Gene Delivery

Adenovirus-Associated Virus Vector–Mediated Gene Transfer in Hemophilia B

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Nathwani, Amit C., Tuddenham, Edward G.D., Rangarajan, Savita, Rosales, Cecilia, McIntosh, Jenny, Linch, David C., Chowdary, Pratima, Riddell, Anne +24 more·2011·New England Journal of Medicine

Abstract

BACKGROUND: Hemophilia B, an X-linked disorder, is ideally suited for gene therapy. We investigated the use of a new gene therapy in patients with the disorder. METHODS: We infused a single dose of a serotype-8-pseudotyped, self-complementary adenovirus-associated virus (AAV) vector expressing a codon-optimized human factor IX (FIX) transgene (scAAV2/8-LP1-hFIXco) in a peripheral vein in six patients with severe hemophilia B (FIX activity, <1% of normal values). Study participants were enrolled sequentially in one of three cohorts (given a high, intermediate, or low dose of vector), with two participants in each group. Vector was administered without immunosuppressive therapy, and participants were followed for 6 to 16 months. RESULTS: AAV-mediated expression of FIX at 2 to 11% of normal levels was observed in all participants. Four of the six discontinued FIX prophylaxis and remained free of spontaneous hemorrhage; in the other two, the interval between prophylactic injections was increased. Of the two participants who received the high dose of vector, one had a transient, asymptomatic elevation of serum aminotransferase levels, which was associated with the detection of AAV8-capsid-specific T cells in the peripheral blood; the other had a slight increase in liver-enzyme levels, the cause of which was less clear. Each of these two participants received a short course of glucocorticoid therapy, which rapidly normalized aminotransferase levels and maintained FIX levels in the range of 3 to 11% of normal values. CONCLUSIONS: Peripheral-vein infusion of scAAV2/8-LP1-hFIXco resulted in FIX transgene expression at levels sufficient to improve the bleeding phenotype, with few side effects. Although immune-mediated clearance of AAV-transduced hepatocytes remains a concern, this process may be controlled with a short course of glucocorticoids without loss of transgene expression. (Funded by the Medical Research Council and others; ClinicalTrials.gov number, NCT00979238.).

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Crossref · 10.1056/nejmoa1108046

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  • Pre-existing antibodies correlated with decreased efficacy of gene therapy in clinical trials where administration exposes vector to serum.

    “the presence of pre-existing antibodies has been correlated with decreased efficacy of gene therapy in clinical trials where the route of administration exposes vector to serum.26,30,31”

    From Antibody neutralization poses a barrier to intravitreal adeno-associated viral vector gene delivery to non-human primates (2015) · cites this paper as [30]

    The Results section (Safety and Efficacy of Peripheral-Vein Infusion of Vector; page unavailable) reports that Participant 3 had higher pre-treatment anti-AAV8 antibody levels and initially low FIX activity, raising the possibility that antibodies blocked transduction. It does not establish a correlation across clinical trials: the authors describe one participant, and his later FIX levels were consistent with successful transgene expression. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • NABs are often the most commonly invoked exclusion criterion for patient enrollment.

    “NABs are often the most commonly invoked exclusion criterion for patent enrollment.30”

    From Antibody neutralization poses a barrier to intravitreal adeno-associated viral vector gene delivery to non-human primates (2015) · cites this paper as [30]

    The Methods > Study Design passage says that patients enrolled in this hemophilia B trial had to lack neutralizing antibodies to AAV8, supporting their use as an enrollment exclusion criterion. It does not establish that this criterion is often used or is the most commonly invoked across trials. No page number is available in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Liver-directed AAV treatments can raise liver transaminases alongside reduced FIX expression, probably because capsid-specific cytotoxic T cells destroy transduced hepatocytes.

    “liver-directed therapies resulting in liver transaminase elevation, which coincides with decreased factor IX (FIX) transgene expression, likely due to AAV capsid-specific cytotoxic T cells destroying transduced hepatocytes (12, 13).”
  • AAV clinical successes to date have involved delivery either to immune privileged regions or to subjects lacking apparent AAV immunological memory.

    “As a result, AAV clinical successes to date have involved delivery either to immune privileged regions or to subjects lacking apparent AAV immunological memory.8–14,30,42”
  • Certain host responses have only been observed with very high doses of intravenous AAV, suggesting a threshold effect for these host reactions.

    “Finally, certain host responses have only been observed with very high doses of intravenous AAV, suggesting a threshold effect for these host reactions [19–21].”

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Authors
Nathwani, A. C., Tuddenham, E. G. D., Rangarajan, S., Rosales, C., McIntosh, J., Linch, D. C., Chowdary, P., Riddell, A., Pie, A. J., Harrington, C., O'Beirne, J., Smith, K., Pasi, J., Glader, B., Rustagi, P., Ng, C. Y. C., Kay, M. A., Zhou, J., Spence, Y., Morton, C. L., Allay, J., Coleman, J., Sleep, S., Cunningham, J. M., Srivastava, D., Basner-Tschakarjan, E., Mingozzi, F., High, K. A., Gray, J. T., Reiss, U. M., Nienhuis, A. W., & Davidoff, A. M.
Affiliations
  • NHS Blood and Transplant (GB)
  • Basingstoke and North Hampshire Hospital (GB)
  • University College London (GB)
  • Queen Mary University of London (GB)
  • Stanford Medicine (US)
  • St. Jude Children's Research Hospital (US)
  • University of Chicago (US)
  • Children's Hospital of Philadelphia (US)
Venue
New England Journal of Medicine
Published
2011-12-22
Volume
365
Issue
25
Pages
2357-2365
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2122304523
Cited by
1,864
References
27
Citations by year
2026: 69 · 2025: 84 · 2024: 99 · 2023: 99 · 2022: 119 · 2021: 103 · 2020: 128 · 2019: 116 · 2018: 123 · 2017: 132 · 2016: 128 · 2015: 164 · 2014: 184 · 2013: 185 · 2012: 122
FWCI
108.53
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • ePrints Soton (University of Southampton) (submittedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • Queen Mary Research Online (Queen Mary University of London) (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • Assisi Foundation of Memphis
  • St. Jude Children's Research Hospital
  • NHS Blood and Transplant
  • American Lebanese Syrian Associated Charities
  • National Institute for Health and Care Research (NF-SI-0507-10370, RP-PG-0310-1001)
  • University College London
  • Medical Research Council
  • National Heart, Lung, and Blood Institute (HL094396, R01HL094396, R01HL073838, R01HL064274)
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, gene therapy, AAV8, factor IX, glucocorticoid therapy, aminotransferase elevation, bleeding phenotype, hepatocytes
MeSH terms
Dependovirus, Adult, Hemophilia B, Factor IX, Genetic Vectors, Humans, Infusions, Intravenous, Middle Aged, Genetic Therapy, Transgenes

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