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Stingl, Katarina; Stingl, Krunoslav; Schwartz, Hillary; Reid, Mark W; Kempf, Melanie; Dimopoulos, Spyridon; Kortuem, Friederike; Borchert, Mark S; Lee, Thomas C; Nagiel, Aaron
Ophthalmology (Rochester, Minn.) 130, Issue: 7Journal Article
To analyze demographic and ophthalmic data in patients with and without chorioretinal atrophy after voretigene neparvovec-rzyl (VN) to identify possible causes for this phenomenon. Retrospective cohort study with longitudinal follow-up. A total of 71 eyes of 38 patients aged 2 to 44 years with RPE65-mediated retinal dystrophy treated with VN across 2 large gene therapy centers in the United States and Germany. Patients treated with VN who developed atrophy were compared with those who did not. Gender, age, surgical center, spherical equivalent refraction, best-corrected visual acuity (BCVA), baseline full-field scotopic threshold testing (FST), and posttreatment change in FST. A total of 20 eyes of 12 patients developed atrophy after treatment with VN (28% of all eyes). There was no significant difference in gender, age, surgical center, or spherical equivalent refraction between the atrophy group and the no atrophy group. However, patients between school age and young adulthood were predominantly affected, whereas the youngest and the oldest patients did not develop atrophy. Baseline BCVA was better in patients who developed atrophy than those who did not (P = 0.006). The postoperative improvement in FST at 1 month was significantly higher in the atrophy group than in the no atrophy group (P = 0.0005), and this difference remained statistically significant at 1 year (P = 0.0001). There was no correlation to baseline FST, to inflammation, or to which eye was treated first. The degree of FST improvement after VN appears to be strongly correlated with the development of VN-related chorioretinal atrophy. This finding raises the possibility that atrophy may develop as a toxic or metabolic sequela of vector-mediated RPE65 expression. In light of the expanding number of retinal gene therapy clinical trials, this complication warrants further study because it may not be limited to VN. Proprietary or commercial disclosure may be found after the references.
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