AGTC Announces Positive Three-Month Interim Results From Skyline Trial of AGTC-501 for the Treatment of X-Linked Retinitis Pigmentosa

UF startup and UF Innovate | Sid Martin Biotech graduate Applied Genetic Technologies Corporation (AGTC), a clinical stage biotechnology company focused on the development of adeno-associated virus (AAV)-based gene therapies for the treatment of rare and debilitating diseases with an initial focus on inherited retinal diseases, today reported positive three-month interim data from its ongoing Phase 2 Skyline trial of AGTC-501, a recombinant AAV viral vector-based gene therapy targeting mutations in the RPGR gene in patients with X-linked retinitis pigmentosa (XLRP).

There were robust improvements in visual sensitivity, the trial’s primary efficacy endpoint, in multiple patients three months after dosing, with a 62.5% response rate in dose group B and a 25% response rate in dose group A. This is well above the statistically significant 50% response rate the Vista Phase 2/3 trial for XLRP is powered to detect. The Company considers a responder to be a patient who has an improvement in visual sensitivity as assessed by microperimetry of at least 7 decibels (dB) in at least 5 loci. Importantly, for responders in this trial, the number of loci that improved by at least 7 dB was between 9 and 17. It is also notable that the mean visual sensitivity of the entire macula increased and the area of the macula with visual sensitivity also increased in the patients who were responders. Although these results exceeded the current standard set by the United States Food and Drug Administration (FDA) that at least 5 loci increase by at least 7 dB, the improved loci were not pre-specified, as also required in the FDA standard.

There was a significant difference in visual sensitivity as assessed by MAIA microperimetry in the treated eyes compared with the untreated eyes of all Skyline responders at 3 months. In the Phase 1/2 trial, patients who were responders at 3 months remained responders at 12 months. Based on the durability of the Phase 1/2 improvements in visual sensitivity, we believe the results observed at 3 months in the Skyline trial will be consistent at 12 months. Additional data related to the Skyline trial is available on the AGTC website or by clicking here.

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