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• W2914705959 abstract "<h3>Importance</h3> Intravitreal gene therapy is regarded as generally safe with limited mild adverse events, but its systemic effects remain to be investigated. <h3>Objective</h3> To examine the association between immune response and intraocular inflammation after ocular gene therapy with recombinant adeno-associated virus 2 carrying the<i>ND4</i>gene (rAAV2/2-<i>ND4</i>). <h3>Design, Setting, and Participants</h3> This secondary analysis of an open-label, dose-escalation phase 1/2 randomized clinical trial of rAAV2/2-<i>ND4 </i>included data from February 13, 2014 (first patient visit), to March 30, 2017 (last patient visit at week 96), the first 2 years after injection. Patients older than 15 years with diagnosed<i>ND4 </i>Leber hereditary optic neuropathy (LHON) and visual acuity of at least counting fingers were enrolled in 1 of 5 cohorts. Four dose cohorts of 3 patients each were treated sequentially. An extension cohort of 3 patients received the dose of 9 × 10¹⁰viral genomes per eye. <h3>Interventions</h3> Patients received increasing doses of rAAV2/2-<i>ND4</i>(9 × 10⁹, 3 × 10¹⁰, 9 × 10¹⁰, and 1.8 × 10¹¹viral genomes per eye) as a single unilateral intravitreal injection. Patients were monitored for 96 weeks after injection; ocular examinations were performed regularly, and blood samples were collected for immunologic testing. <h3>Main Outcomes and Measures</h3> A composite ocular inflammation score (OIS) was calculated based on grades of anterior chamber cells and flare, vitreous cells, and haze according to the Standardization of Uveitis Nomenclature. The systemic immune response was quantified by enzyme-linked immunospot (cellular immune response), enzyme-linked immunosorbent assay (IgG titers), and luciferase assay (neutralizing antibody [NAb] titers). <h3>Results</h3> The present analysis included 15 patients (mean [SD] age, 47.9 [17.2] years; 13 men and 2 women) enrolled in the 5 cohorts of the clinical trial. Thirteen patients experienced intraocular inflammation after rAAV2/2-<i>ND4</i>administration. Mild anterior chamber inflammation and vitritis were reported at all doses, and all cases were responsive to treatment. A maximum OIS of 9.5 was observed in a patient with history of idiopathic uveitis. Overall, OIS was not associated with the viral dose administered. No NAbs against AAV2 were detected in aqueous humor before treatment. Two patients tested positive for cellular immune response against AAV2 at baseline and after treatment. Humoral immune response was not apparently associated with the dose administered or with the immune status of patients at baseline. No association was found between OISs and serum NAb titers. <h3>Conclusions and Relevance</h3> In this study, intravitreal administration of rAAV2/2-<i>ND4</i>in patients with LHON was safe and well tolerated. Further investigations may shed light into the local immune response to rAAV2/2-<i>ND4</i>as a potential explanation for the observed intraocular inflammation." @default.
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• W2914705959 date "2019-04-01" @default.
• W2914705959 modified "2023-10-16" @default.
• W2914705959 title "Immune Response and Intraocular Inflammation in Patients With Leber Hereditary Optic Neuropathy Treated With Intravitreal Injection of Recombinant Adeno-Associated Virus 2 Carrying the <i>ND4</i> Gene" @default.
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• W2914705959 doi "https://doi.org/10.1001/jamaophthalmol.2018.6902" @default.
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