The head of the Department of Ophthalmology at the Center for Medical Genetics, Ghent University Hospital, discussed the main takeaways of a post-marketing study on the gene therapy.
“[P]atients are navigating in conditions where they were never able to see anything before—so much so that when people now go out, during a sunny day, they start wearing sunglasses... Like for example here in New Orleans, with highly intense sunshine, I have to wear sunglasses to be comfortable—and that's what they say as well. So I think the main takeaway is it does work. It works as intended. And there are no surprises at the level of safety, as well.”
Spark Therapeutics’ voretigene neparvovec (Luxturna) was approved by the FDA in December 2017 and by the European Medicines Agency (EMA) in 2018 for the treatment of inherited retinal dystrophy related to mutations in the RPE65 gene.1,2 The FDA approval was based in part on the results of a pivotal phase 3 clinical trial (NCT00999609) which evaluated the efficacy and safety of the treatment.
Findings from a post-marketing study intended to confirm the results of this trial in a real-world setting were presented in a poster entitled “Results of Belgian patients with RPE65-related inherited retinal dystrophy 6 months after treatment with voretigene neparvovec” at the Association for Research in Vision and Ophthalmology (ARVO) 2023 Annual Meeting, held April 23-27, 2023, in New Orleans, Louisiana.3
In an interview with CGTLive™, Bart P. Leroy, MD, PhD, the head of the Department of Ophthalmology at the Center for Medical Genetics, Ghent University Hospital, who co-authored the poster, discussed the implications of the main results. He stated that the efficacy findings, which included improvements in full-field sensitivity testing (FST), but no significant improvements in best corrected visual acuity (BCVA), confirm the results seen in the phase 3 clinical trial and earlier studies. He also noted that there were no unexpected safety findings in the new study. Leroy gave several examples of how the FST improvements can translate to meaningful changes in daily living for patients and additionally elaborated on the likely reasons why improvements in BCVA were not observed, pointing out that Luxturna has very little impact on central cone function.
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