Experimental gene therapy offers hope for rare blindness condition

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Subjects who were randomly assigned as the control group in a multicenter, randomized controlled, Phase III clinical trial (Protocol number: ZYA-2024-001) on the efficacy and safety of a single subretinal injection of ZVS101e in subjects with BCD and completed a 52-week safety follow-up were included. 2. Voluntarily participate in clinical trials and sign informed consent forms, and be willing to complete all trial procedures as required by the protocol. 3. Study the BCVA of the eye ≤60 ETDRS letters. Exclusion Criteria: 1. The study eye currently has or has had macular degeneration such as macular holes or neovascularization in the macular area; Other ocular diseases such as glaucoma and diabetic retinopathy that may hinder surgery or interfere with the interpretation of the study endpoint. 2. The study eye had undergone retinal repositioning surgery, vitrectomy, or had undergone any intraocular surgery within 3 months prior to enrollment, such as phacoemulsification for cataract. 3. Within one month prior to enrollment, the patient had a viral infectious disease that may affect the efficacy and safety evaluation of the investigational drug or had received an antiviral vaccine. 4. Any eye has previously received gene therapy or stem cell therapy for BCD and other ocular diseases, including but not limited to other viral vector gene therapies, mRNA therapies, etc. 5. Known to be allergic to the drugs planned to be used in the study. 6. The following laboratory test abnormalities have clinical significance: Liver function: ALT or AST\>2 times the upper limit of the normal value; Abnormal coagulation function (prothrombin time ≥ the upper limit of normal value by 3 seconds, activated partial thromboplastin time ≥ the upper limit of normal value by 10 seconds). 7. Pregnant or lactating women.