Long-term Follow-up Study in Subjects Who Received Voretigene Neparvovec-rzyl (AAV2-hRPE65v2)
Study Details
Study Description
Brief Summary
Multi-site, non-randomized, observational study, for up to 15 years after subretinal AAV2-hRPE65v2 administration for each subject. The study is a non-interventional, follow-up study of subjects who participated in previous AAV2-hRPE65v2 gene therapy clinical trials.
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Detailed Description
This is an observational follow-up study of subjects who participated in previous Phase 1 and Phase 3 clinical trials of AAV2-hRPE65v2 gene therapy (voretigene neparvovec-rzyl) to evaluate long term durability and safety for 15 years after subretinal administration.
Study Design
Outcome Measures
Primary Outcome Measures
- Mobility testing, Bilateral [15 years]
Mobility testing will be videotaped at each study visit at which it is conducted. Independent reviewers may grade subjects' mobility videos. Graders will use a defined combination of speed and accuracy to grade each course attempt at a given light intensity. The course will be re-configured between each attempt, using twelve standardized templates, to reduce the impact of a potential learning effect. Each subject will be tested, using both eyes, under at least two and sometimes three different (specified) lighting conditions. The levels of light, selected to span lighting conditions that individuals encounter in daily life, range from a studio with floodlights (400 lux) or a brightly lit office (250 lux) down to a poorly lit sidewalk at night (1 lux).
Secondary Outcome Measures
- Full-field light sensitivity threshold (FST) testing [15 years]
FST testing measures the light sensitivity of the entire visual field by recording the luminance at which a subject reports seeing the dimmest flash. The test is carried out on subjects with dilated eyes in a dark-adapted state; subjects are seated in front of a Ganzfeld dome in which the light flashes are generated. The light sensitivity of each eye is measured separately by patching one eye (and then the other). A sound is generated and the subject presses one button when they see a flash or a second button if they do not see a flash. Flashes of varying luminance (in a range spanning ~80 dB) are presented in a randomized order with no flashes, except that the series starts with dim flashes. From this data, an algorithm calculates the minimum luminance (for each eye) at which the subject perceives light.
- Mobility testing, Monocular [15 years]
Mobility testing will be videotaped at each study visit at which it is conducted. Independent reviewers may grade subjects' mobility videos. Graders will use a defined combination of speed and accuracy to grade each course attempt at a given light intensity. The course will be re-configured between each attempt, using twelve standardized templates, to reduce the impact of a potential learning effect. Each subject will be tested, using the first treated eye, under at least two and sometimes three different (specified) lighting conditions. The levels of light, selected to span lighting conditions that individuals encounter in daily life, range from a studio with floodlights (400 lux) or a brightly lit office (250 lux) down to a poorly lit sidewalk at night (1 lux).
- Visual acuity [15 years]
Visual acuity measures central vision using the ability to resolve standard optotype images presented as letters corresponding to different visual angles, i.e., image size. This testing will include age-adapted tests, such as ETDRS testing or HOTV testing (which uses the letters H, O, T, V, which can be identified even by young children and all four of which center around a vertical axis). The level of central visual resolution is converted to a visual angle score (LogMAR). Subjects may, in some cases, need to undergo repeated testing sessions, including on successive days, to establish consistent measurements on psychophysical tests, such as visual acuity.
Other Outcome Measures
- Visual field testing - Humphrey and/or Goldmann [15 years]
Visual field parameters will evaluate alterations in function of different regions of the retina; kinetic fields will be measured with Goldmann perimetry and static fields with Humphrey computerized testing.
- Visual function questionnaire [15 years]
The gene therapy study investigators developed a questionnaire relevant to the deficit experienced by patients with RPE65 gene mutations. This patient-reported outcome consists of 25 questions pertaining to activities of daily living that are dependent upon vision or have a vision component. Subjects and/or their parent or guardian will be asked to provide all responses regarding the perceived degree of difficulty of these activities of daily living.
Eligibility Criteria
Criteria
Inclusion Criteria:
- Subjects who participated in prior subretinal AAV2-hRPE65v2 gene therapy clinical studies
Exclusion Criteria:
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Subjects who will not consent for study.
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Subjects who the investigators believe are not capable of performing study assessments
Contacts and Locations
Locations
No locations specified.Sponsors and Collaborators
- Spark Therapeutics
Investigators
- Principal Investigator: Albert Maguire, MD, University of Pennsylvania
- Principal Investigator: Stephen Russell, MD, University of Iowa
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- AAV2-hRPE65v2-LTFU-01