ProQR Announces Fourth Quarter and Full Year 2020 Operating and Financial Results ProQR Announces Fourth Quarter and Full Year 2020 Operating and Financial Results Phase 2/3 pivotal Brighten pediatric trial of sepofarsen to begin in 2021; additional data from Phase 1/2 InSight extension study to be reported in H2 2021 QR-421a Stellar Phase 1/2 trial for Usher syndrome and non-syndromic retinitis pigmentosa interim analysis on track for late Q1/early Q2 2021 Further pipeline progress anticipated with first clinical data in 2021 from QR-1123 program for autosomal dominant retinitis pigmentosa and QR-504a clinical study in Fuchs endothelial corneal dystrophy expected to start in H1 2021 Cash runway into 2023