Results at 2 Years after Gene Therapy for RPE65-Deficient Leber Congenital Amaurosis and Severe Early-Childhood-Onset Retinal Dystrophy

Richard G. Weleber, Mark E. Pennesi, David J. Wilson, Shalesh Kaushal, Laura R. Erker, Lauren Jensen, Maureen T. McBride, Terence R. Flotte, Margaret Humphries, Roberto Calcedo, William W. Hauswirth, Jeffrey D. Chulay, J. Timothy Stout

Research output: Contribution to journalArticle

93 Scopus citations

Abstract

Purpose To provide an initial assessment of the safety of a recombinant adeno-associated virus vector expressing RPE65 (rAAV2-CB-hRPE65) in adults and children with retinal degeneration caused by RPE65 mutations. Design Nonrandomized, multicenter clinical trial. Participants Eight adults and 4 children, 6 to 39 years of age, with Leber congenital amaurosis (LCA) or severe early-childhood-onset retinal degeneration (SECORD). Methods Patients received a subretinal injection of rAAV2-CB-hRPE65 in the poorer-seeing eye, at either of 2 dose levels, and were followed up for 2 years after treatment. Main Outcome Measures The primary safety measures were ocular and nonocular adverse events. Exploratory efficacy measures included changes in best-corrected visual acuity (BCVA), static perimetry central 30° visual field hill of vision (V30) and total visual field hill of vision (VTOT), kinetic perimetry visual field area, and responses to a quality-of-life questionnaire. Results All patients tolerated subretinal injections and there were no treatment-related serious adverse events. Common adverse events were those associated with the surgical procedure and included subconjunctival hemorrhage in 8 patients and ocular hyperemia in 5 patients. In the treated eye, BCVA increased in 5 patients, V30 increased in 6 patients, VTOT increased in 5 patients, and kinetic visual field area improved in 3 patients. One subject showed a decrease in BCVA and 2 patients showed a decrease in kinetic visual field area. Conclusions Treatment with rAAV2-CB-hRPE65 was not associated with serious adverse events, and improvement in 1 or more measures of visual function was observed in 9 of 12 patients. The greatest improvements in visual acuity were observed in younger patients with better baseline visual acuity. Evaluation of more patients and a longer duration of follow-up will be needed to determine the rate of uncommon or rare side effects or safety concerns.

Original languageEnglish (US)
Pages (from-to)1606-1620
Number of pages15
JournalOphthalmology
Volume123
Issue number7
DOIs
StatePublished - Jul 1 2016

ASJC Scopus subject areas

  • Ophthalmology

Fingerprint Dive into the research topics of 'Results at 2 Years after Gene Therapy for RPE65-Deficient Leber Congenital Amaurosis and Severe Early-Childhood-Onset Retinal Dystrophy'. Together they form a unique fingerprint.

  • Cite this

    Weleber, R. G., Pennesi, M. E., Wilson, D. J., Kaushal, S., Erker, L. R., Jensen, L., McBride, M. T., Flotte, T. R., Humphries, M., Calcedo, R., Hauswirth, W. W., Chulay, J. D., & Stout, J. T. (2016). Results at 2 Years after Gene Therapy for RPE65-Deficient Leber Congenital Amaurosis and Severe Early-Childhood-Onset Retinal Dystrophy. Ophthalmology, 123(7), 1606-1620. https://doi.org/10.1016/j.ophtha.2016.03.003