Cited by 796Retinal Development and DisordersVirus-based gene therapy researchRetinal Diseases and Treatments

Retinal gene therapy in patients with choroideremia: initial findings from a phase 1/2 clinical trial

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MacLaren, Robert E, Groppe, Markus, Barnard, Alun R, Cottriall, Charles L, Tolmachova, Tanya, Seymour, Len, Clark, K Reed, During, Matthew J +6 more·2014·The Lancet

Abstract

Background Choroideremia is an X-linked recessive disease that leads to blindness due to mutations in the CHM gene, which encodes the Rab escort protein 1 (REP1). We assessed the effects of retinal gene therapy with an adeno-associated viral (AAV) vector encoding REP1 (AAV.REP1) in patients with this disease.Methods In a multicentre clinical trial, six male patients (aged 35-63 years) with choroideremia were administered AAV.REP1 (0·6-1·0×10(10) genome particles, subfoveal injection). Visual function tests included best corrected visual acuity, microperimetry, and retinal sensitivity tests for comparison of baseline values with 6 months after surgery. This study is registered with ClinicalTrials.gov, number NCT01461213.Findings Despite undergoing retinal detachment, which normally reduces vision, two patients with advanced choroideremia who had low baseline best corrected visual acuity gained 21 letters and 11 letters (more than two and four lines of vision). Four other patients with near normal best corrected visual acuity at baseline recovered to within one to three letters. Mean gain in visual acuity overall was 3·8 letters (SE 4·1). Maximal sensitivity measured with dark-adapted microperimetry increased in the treated eyes from 23·0 dB (SE 1·1) at baseline to 25·3 dB (1·3) after treatment (increase 2·3 dB [95% CI 0·8-3·8]). In all patients, over the 6 months, the increase in retinal sensitivity in the treated eyes (mean 1·7 [SE 1·0]) was correlated with the vector dose administered per mm(2) of surviving retina (r=0·82, p=0·04). By contrast, small non-significant reductions (p>0·05) were noted in the control eyes in both maximal sensitivity (-0·8 dB [1·5]) and mean sensitivity (-1·6 dB [0·9]). One patient in whom the vector was not administered to the fovea re-established variable eccentric fixation that included the ectopic island of surviving retinal pigment epithelium that had been exposed to vector.Interpretation The initial results of this retinal gene therapy trial are consistent with improved rod and cone function that overcome any negative effects of retinal detachment. These findings lend support to further assessment of gene therapy in the treatment of choroideremia and other diseases, such as age-related macular degeneration, for which intervention should ideally be applied before the onset of retinal thinning.Funding UK Department of Health and Wellcome Trust.

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Crossref · 10.1016/s0140-6736(13)62117-0

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  • Despite a 28-day oral corticosteroid therapy started 2 days before the first IVT, 70.7% of lenadogene nolparvovec-treated eyes developed some degree of intraocular inflammation versus 10.2% of placebo-treated eyes.

    “Despite a 28-day oral corticosteroid therapy started 2 days before the first IVT, a regimen similar to that provided in several other clinical studies using IVT or sub-retinal AAV-based gene therapies,41–45 70.7% of lenadogene nolparvovec-treated eyes developed some degree of intraocular inflammation versus 10.2% of placebo-treated eyes.”

    From Randomized trial of bilateral gene therapy injection for m.11778G&amp;gt;A <i>MT-ND4</i> Leber optic neuropathy (2023) · cites this paper as [44]

    The Methods > Surgery passage describes a subretinal AAV gene-therapy study in which patients received oral prednisolone starting two days before surgery. That supports the cited comparison in route and timing, but the course lasted 10 days, not 28. The inflammation percentages follow the citation and are not attributed to this source. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Wild-type AAV-based gene therapies for ophthalmologic indications generally require relatively high doses and/or administration via subretinal injection, an invasive surgical procedure that requires detachment of photoreceptors from the RPE and reportedly results in transduction of less than 5% of the retinal surface.

    “As a consequence, wild-type AAV-based gene therapies for ophthalmologic indications generally require relatively high doses and/or administration via subretinal injection, an invasive surgical procedure that requires detachment of photoreceptors from the RPE and reportedly results in transduction of <5% of the retinal surface. 25 – 27”

    From Design and Characterization of a Novel Intravitreal Dual-Transgene Genetic Medicine for Neovascular Retinopathies (2024) · cites this paper as [26]

    Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

    Experimental — accuracy not yet measured
  • AAV vector-mediated retinal gene therapies have demonstrated efficacy in clinical trials for inherited retinal dystrophies.

    “Although adeno-associated viral (AAV) vector-mediated retinal gene therapies have demonstrated efficacy”
  • A phase I choroideremia trial showed promising signs of efficacy.

    “Moreover, a recent phase I trial for choroideremia showed promising signs of efficacy.15”
  • AAV has been successful in clinical gene therapy trials for LCA, hemophilia, familial lipoprotein lipase deficiency, and choroideremia.

    “Adeno-associated virus has been successful in clinical gene therapy trials for Leber's congenital amaurosis, hemophilia, familial lipoprotein lipase deficiency, and choroideremia.8–15,26,27,60,61”

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Authors
MacLaren, R. E., Groppe, M., Barnard, A. R., Cottriall, C. L., Tolmachova, T., Seymour, L., Clark, K. R., During, M. J., Cremers, F. P. M., Black, G. C. M., Lotery, A. J., Downes, S. M., Webster, A. R., & Seabra, M. C.
Affiliations
  • Moorfields Eye Hospital NHS Foundation Trust (GB)
  • University of Oxford (GB)
  • NIHR Oxford Biomedical Research Centre (GB)
  • Imperial College London (GB)
  • Nationwide Children's Hospital (US)
  • The Ohio State University Wexner Medical Center (US)
  • Radboud University Nijmegen (NL)
  • Manchester Academic Health Science Centre (GB)
  • University of Southampton (GB)
Venue
The Lancet
Publisher
Elsevier BV
Published
2014-03
Volume
383
Issue
9923
Pages
1129-1137
ISSN
  • 0099-5355 (ISSN-L)
  • 0140-6736
OpenAlex
W2126115955
Cited by
796
References
28
Citations by year
2026: 24 · 2025: 29 · 2024: 46 · 2023: 42 · 2022: 37 · 2021: 62 · 2020: 68 · 2019: 78 · 2018: 85 · 2017: 109 · 2016: 80 · 2015: 83 · 2014: 51 · 2013: 1
FWCI
44.12
Type
journal article
Language
en
Open access
Locations
  • The Lancet (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • ePrints Soton (University of Southampton) (acceptedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • Research Explorer (The University of Manchester) (submittedVersion)
  • Radboud Repository (Radboud University) (submittedVersion)
Funders
  • Wellcome Trust (091984)
  • Cancer Research UK (11339)
  • National Institute for Health and Care Research (NF-SI-0509-10185)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
Keywords
choroideremia, retinal gene therapy, adeno-associated virus vectors, Rab escort protein 1, CHM gene, X-linked retinal degeneration, visual acuity improvement, retinal sensitivity, microperimetry, retinal detachment, vector dose, rod and cone function, retinal pigment epithelium, eccentric fixation, blindness treatment
MeSH terms
Adenoviridae, Adult, Aged, Fluorescence, Genetic Vectors, Humans, Male, Middle Aged, Retinal Detachment, Visual Acuity, Genetic Therapy, Choroideremia, Gene Transfer Techniques, Transgenes, Adaptor Proteins, Signal Transducing, Injections, Intraocular

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