A Phase 1/2, First-in-Human Dose Escalation/Expansion Study to Evaluate the Safety, Tolerability and Preliminary Efficacy of a Subretinal Injection of SB-007 in Subjects With Stargardt Disease (STGD1)

Prior treatment

• Have had any intraocular surgery (including cataract surgery) or thermal laser within 90 days of the Screening Visit or planned intraocular surgery (including cataract surgery) or thermal laser during the period of the study, in the study eye.
• Have had any major surgical procedure within 30 days of the Screening Visit or planned or anticipated major surgery during the period of the study.
• Have received any investigational therapy within 90 days of the Screening Visit or 5 half-lives, whichever is longer.

Other illness

• Have a history of amblyopia in the study eye.
• Have any ophthalmic history of gene therapy, stem cell therapy, surgical implantation of prosthetic retinal chips, or intravitreal or sub-retinal or supra-choroidal injections.
• Have known serious allergies to the fluorescein dye that might be used to measure IOP, ocular dilating drops, topical ocular anesthetic, steroid medication, or components of the SB-007 formulation.
• Have any significant ocular or non-ocular disease/disorder which, in the opinion of the Investigator and with concurrence of the Medical Monitor, may either put the subject at risk because of participation in the study, may influence the results of the study, or affect the subject's ability to participate in the study.

Other

• Subjects must be excluded from participating in the study if they:
• Have two pathogenic or likely pathogenic variants in IRD genes (other than ABCA4) or a single pathogenic or likely pathogenic variant in autosomal dominant or X-linked IRD genes.
• Are unwilling to stop taking the following products at Screening and throughout the study:
  • Supplements containing vitamin A or beta-carotene, liver-based products.
  • Prescription oral retinoids. Topical products containing vitamin A or retinoids are not exclusionary.
• Are an immediate family member (e.g., child, sibling) of the Sponsor or study site personnel.

• To be eligible for study participation, subjects must meet the following criteria:
• Provide written consent. Subjects under legal age will also provide informed assent according to guidelines set forth by the same.
• Are male or female adolescents and adults, aged as follows:
  • In Part A, subjects will be ≥18 to ≤65\* years (inclusive)
  • In Part B, subject age is planned as ≥12 to ≤65\* years (inclusive) \*Subjects aged \>65 years may be eligible in Parts A and B, following discussion with, and approval by, the Medical Monitor.
• Are able to understand and comply with the study procedures.
• Have a diagnosis of STGD1 caused by bi-allelic pathogenic, or likely pathogenic, variants in the ABCA4 gene confirmed genotypically by an accredited genetic testing laboratory
• Clinical evidence consistent with Stargardt Disease type 1.
• For women of child-bearing potential (WOCBP), have a negative pregnancy test at Screening and, if due to receive active treatment, at Day 0.
• For both WOCBP and male subjects (or their female partners who are of child-bearing potential), agree to either strict abstinence or, if sexually active, use an acceptable contraception measure for 3 months from Day 0
• Must have clear ocular media and adequate pupillary dilation in the study eye, including no allergy to dilating eyedrops, to permit good quality retinal imaging.
• Fulfil visual acuity criteria based on ETDRS letter chart
• Fulfil baseline lesion size measurement, as measured by the Reading Center
• Evidence of disease progression as determined by the Medical Monitor following consultation with the Investigator.