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Restoration of Cone Sensitivity to Individuals with Congenital Photoreceptor Blindness within the Phase 1/2 Sepofarsen Trial. | LitMetric

AI Article Synopsis

Article Abstract

Purpose: To understand consequences of reconstituting cone photoreceptor function in congenital binocular blindness resulting from mutations in the () gene.

Design: Phase 1b/2 open-label, multicenter, multiple-dose, dose-escalation trial.

Participants: A homogeneous subgroup of 5 participants with light perception (LP) vision at the time of enrollment (age range, 15-41 years) selected for detailed analyses. Medical histories of 4 participants were consistent with congenital binocular blindness, whereas 1 participant showed evidence of spatial vision in early life that was later lost.

Intervention: Participants received a single intravitreal injection of sepofarsen (160 or 320 μg) into the study eye.

Main Outcome Measures: Full-field stimulus testing (FST), visual acuity (VA), and transient pupillary light reflex (TPLR) were measured at baseline and for 3 months after the injection.

Results: All 5 participants with LP vision demonstrated severely abnormal FST and TPLR findings. At baseline, FST threshold estimates were 0.81 and 1.0 log cd/m for control and study eyes, respectively. At 3 months, study eyes showed a large mean improvement of -1.75 log versus baseline ( < 0.001), whereas untreated control eyes were comparable with baseline. Blue minus red FST values were not different than 0 ( = 0.59), compatible with cone mediation of remnant vision. At baseline, TPLR response amplitude and latency estimates were 0.39 mm and 0.72 seconds, respectively, for control eyes, and 0.28 mm and 0.78 seconds, respectively, for study eyes. At 3 months, study eyes showed a mean improvement of 0.44 mm in amplitude and a mean acceleration of 0.29 seconds in latency versus baseline ( < 0.001), whereas control eyes showed no significant change versus baseline. Specialized tests performed in 1 participant confirmed and extended the standardized results from all 5 participants.

Conclusions: By subjective and objective evidence, intravitreal sepofarsen provides improvement of light sensitivity for individuals with LP vision. However, translation of increased light sensitivity to improved spatial vision may occur preferentially in those with a history of visual experience during early neurodevelopment. Interventions for congenital lack of spatial vision in -associated Leber congenital amaurosis may lead to better results if performed before visual cortex maturity.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9562351PMC
http://dx.doi.org/10.1016/j.xops.2022.100133DOI Listing

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