Evidence map›Paper›PMID 33199875›Full record

ArticleNature biotechnology2021

A long-term study of AAV gene therapy in dogs with hemophilia A identifies clonal expansions of transduced liver cells.

Giang N Nguyen, John K Everett, Samita Kafle, Aoife M Roche, Hayley E Raymond, Jacob Leiby, Christian Wood, Charles-Antoine Assenmacher, Elizabeth P Merricks, C Tyler Long and 4 more

Open access · greenAbstract read
In one paragraph

Article in Nature biotechnology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 241 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
241citing papers in PubMed, 1 pooled it
41.6field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

241 citing papers in PubMed, 1 synthesis or guideline pooled it, 436 citations in OpenAlex.

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  19. Malignancy and gene therapy in hemophilia.Research and practice in thrombosis and haemostasis · 2026
    Article
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181 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

14 authors at 4 institutions in 1 country.

Giang N Nguyen *The Raymond G. Perelman Center for Cellular and Molecular Therapeutics, Children's Hospital of Philadelphia, Philadelphia, PA, USA.
John K Everett *Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Samita KafleThe Raymond G. Perelman Center for Cellular and Molecular Therapeutics, Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Aoife M RocheDepartment of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Hayley E RaymondDepartment of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Jacob LeibyDepartment of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Christian WoodThe Raymond G. Perelman Center for Cellular and Molecular Therapeutics, Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Charles-Antoine AssenmacherDepartment of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA.ORCID http://orcid.org/0000-0003-0073-2730
Elizabeth P MerricksDepartment of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
C Tyler LongDepartment of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Haig H KazazianDepartment of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA.
Timothy C NicholsDepartment of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Frederic D BushmanDepartment of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.ORCID http://orcid.org/0000-0003-4740-4056
Denise E SabatinoThe Raymond G. Perelman Center for Cellular and Molecular Therapeutics, Children's Hospital of Philadelphia, Philadelphia, PA, USA. dsabatin@pennmedicine.upenn.edu.ORCID http://orcid.org/0000-0002-6116-5453
University of Pennsylvania · USChildren's Hospital of Philadelphia · USUniversity of North Carolina at Chapel Hill · USJohns Hopkins University · US

Funding

Virus & Reservoirs CoreP30AI045008 · NIAID · UNIVERSITY OF PENNSYLVANIA · PI DAVID S METZGER · 1999 to 2026
$78.6M
Maintenance of Models of Human Hemophilia and VWDR24HL063098 · NHLBI · UNIV OF NORTH CAROLINA CHAPEL HILL · PI NICHOLS, TIMOTHY CHARLES · 1999 to 2019
$15.1M
Modeling HIV CAR-T cell trafficking and persistence in Non-Human PrimatesU19AI149680 · NIAID · UNIVERSITY OF PENNSYLVANIA · PI RILEY, JAMES L. · 2020 to 2024
$13.2M
Sequencing and Viral Evolution CoreU19AI117950 · NIAID · UNIVERSITY OF PENNSYLVANIA · PI WHERRY, E. JOHN · 2015 to 2019
$12.0M
A Phase I Clinical Trial Testing Feasibility of Hematopoietic Stem Cell Gene Therapy Using Platelet Factor VIII to Safely Improve Hemostasis for Severe Hemophilia A with Inhibitory AntibodiesR01HL142791 · NHLBI · MEDICAL COLLEGE OF WISCONSIN · PI EAPEN, MARY, WILCOX, DAVID ALLEN · 2019 to 2023
$8.2M
Massively Parallel Analysis of Integration in Therapeutic Gene TransferR01AI082020 · NIAID · UNIVERSITY OF PENNSYLVANIA · PI BUSHMAN, FREDERIC D · 2009 to 2018
$3.5M
Linking insertional mutagenesis and cell function to improve CAR T cell therapyR01CA241762 · NCI · UNIVERSITY OF PENNSYLVANIA · PI BUSHMAN, FREDERIC D, MELENHORST, JAN J · 2019 to 2023
$3.1M
Novel factor VIII variants for improved efficacy in gene therapy for hemophilia AR01HL126850 · NHLBI · CHILDREN'S HOSP OF PHILADELPHIA · PI SABATINO, DENISE E · 2016 to 2020
$2.1M
Preclinical gene correction of hemophilia AR01HL083017 · NHLBI · UNIVERSITY OF PENNSYLVANIA · PI KAZAZIAN, HAIG H. · 2007 to 2010
$1.6M
NCI NIH HHS R01 CA241762NHLBI NIH HHS R01 HL083017NHLBI NIH HHS R01 HL126850NHLBI NIH HHS R01 HL142791NHLBI NIH HHS R24 HL063098NIAID NIH HHS P30 AI045008NIAID NIH HHS R01 AI082020NIAID NIH HHS U19 AI117950NIAID NIH HHS U19 AI149680
6 · The paper itself

Abstract

Nine dogs with hemophilia A were treated with adeno-associated viral (AAV) gene therapy and followed for up to 10 years. Administration of AAV8 or AAV9 vectors expressing canine factor VIII (AAV-cFVIII) corrected the FVIII deficiency to 1.9-11.3% of normal FVIII levels. In two of nine dogs, levels of FVIII activity increased gradually starting about 4 years after treatment. None of the dogs showed evidence of tumors or altered liver function. Analysis of integration sites in liver samples from six treated dogs identified 1,741 unique AAV integration events in genomic DNA and expanded cell clones in five dogs, with 44% of the integrations near genes involved in cell growth. All recovered integrated vectors were partially deleted and/or rearranged. Our data suggest that the increase in FVIII protein expression in two dogs may have been due to clonal expansion of cells harboring integrated vectors. These results support the clinical development of liver-directed AAV gene therapy for hemophilia A, while emphasizing the importance of long-term monitoring for potential genotoxicity.

Indexed as

Factor VIIIHemophilia ALiverAnimalsDependovirusDogsGenetic TherapyHepatocytesProspective StudiesFactor VIII

Identifiers

PMID33199875
PMCPMC7855056
OpenAlexW3102945151

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.