Abstract:
Purpose:Asymmetry in disease progression between left and right eyes can occur in Stargardt disease (STGD1), and this needs to be considered in novel therapeutic trials with a fellow-eye paired controlled design. This study investigated the inter-eye discordance of best-corrected visual acuity (BCVA) and progression of RPE atrophy in STGD1. Methods:We performed a retrospective cohort study collecting 68 STGD1 patients (136 eyes) with ≥1 ABCA4 variants and ≥0.5-year follow-up on BCVA and fundus autofluorescence. We compared inter-eye correlations of RPE atrophy progression between early-onset (≤10 years), intermediate-onset (11-44), and late-onset (≥45) STGD1 and ABCA4 variant combinations by χ2 tests. We identified associations of discordant baseline BCVA and RPE atrophy with discordant RPE atrophy progression by odds ratios (OR). We defined discordance by differences >1.5 interquartile ranges ± first/third interquartiles. Results:Progression of RPE atrophy correlated moderately between eyes (ρ = 0.766), which decreased with later onset (P = 9.8 × 10-7) and lower pathogenicity of ABCA4 combinations (P = 0.007). Twelve patients (17.6%) had discordant inter-eye RPE atrophy progression, associated with baseline discordance of RPE atrophy (OR, 6.50 [1.35-31.34]), but not BCVA (OR, 0.33 [0.04-2.85]). Conclusions:Lower inter-eye correlations are more likely found in late-onset STGD1 and patients carrying low pathogenic ABCA4 combinations. To achieve the highest power in a therapeutic trial, early-phase studies should minimize inter-eye discordance by selecting early-onset STGD1 patients carrying severe ABCA4 variants without evidence of asymmetry at baseline.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Lambertus S,Bax NM,Groenewoud JM,Cremers FP,van der Wilt GJ,Klevering BJ,Theelen T,Hoyng CBdoi
10.1167/iovs.16-20963subject
Has Abstractpub_date
2016-12-01 00:00:00pages
6824-6830issue
15eissn
0146-0404issn
1552-5783pii
2595015journal_volume
57pub_type
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