Stargardt disease type 1 (STGD1) is a rare genetic eye condition that causes progressive vision loss, often beginning in childhood or adolescence. It is the most common form of inherited macular degeneration and can lead to legal blindness. STGD1 is caused by mutations in the ABCA4 gene, which normally helps clear waste from the photoreceptor cells in the retina. When ABCA4 gene doesn't function properly, toxic substances like A2E accumulate and damage the retinal pigment epithelium (RPE), leading to vision loss.
There are currently no approved treatments for STGD1. HG005 is an investigational gene therapy designed to deliver a healthy copy of the ABCA4 gene to the retina. Because the gene is too large to fit into a single AAV (adeno-associated virus) vector, HG005 used two AAV vectors that work together in retinal cells to produce the full-length, functional ABCA4 protein. The goal of HG005 is to restore normal waste removal, protect retinal cells from further damage, and slow or stop vision loss.
Patient ≥ 6 and ≤17 years at the time of signing informed consent, with clinical diagnosis of Stargardt disease;
At least one ABCA4 allele on each chromosome;
Both eyes must have well-defined macular atrophic lesions consistent with the diagnosis of Stargardt macular dystrophy.
Meet visual acuity criteria based on ETDRS letter chart
Presence of active intraocular inflammation or uveitis history in either eye;
Presence of ocular or periocular infection history in either eye within 2 weeks prior to selection;
History or presence of corneal dystrophy in the study eye;
History of HIV or hepatitis A, B, or C infection;
Single group
HG005
GeneticOnce subretinal injection; The duration of the study is about 52 weeks for each subject, including a 4 weeks screening period, enrollment visit, treatment visit, and 56 weeks follow-up period.
Incidence and severity of systemic adverse events
Number of adverse events (AEs), serious adverse events (SAEs), and dose-limiting toxicities (DLTs)
Change of study eye versus control eye in Low Luminance Visual Acuity(LLVA)
Change of study eye versus control eye in Fundus Autofluorescence (FAF)
Change of study eye versus control eye in Optical Coherence Tomography (OCT)
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