NCT04545736 Oral Metformin for Treatment of ABCA4 Retinopathy
| NCT ID | NCT04545736 |
| Status | Recruiting |
| Phase | Phase 1, Phase 2 |
| Sponsor | National Eye Institute (NEI) |
| Condition | ABCA4 Retinopathy |
| Study Type | INTERVENTIONAL |
| Enrollment | 56 participants |
| Start Date | 2020-11-23 |
| Primary Completion | 2028-09-30 |
Eligibility & Interventions
Eligibility Fast-Check
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What to Expect as a Participant
You will actively receive the study intervention — which may be a drug, biologic, device, or procedure.
Phase 1 is the earliest stage of human testing — safety and dosage are the primary focus. Visits are frequent and medical supervision is intensive. You will be among the first people to receive this treatment.
This trial targets 56 participants in total. It began in 2020-11-23 with a primary completion date of 2028-09-30.
⚠ This information is for research awareness only. Always consult your physician before joining any clinical trial. Participation is voluntary and you may withdraw at any time.
Brief Summary
Background: ABCA4 retinopathy is a genetic disease in which the ABCA4 protein is absent or faulty. It can cause waste material to collect in the eye and may cause cells to die. The cell death can lead to vision loss. Researchers want to see if an oral drug called metformin can help. Objective: To see if metformin is safe and possibly helps to slow the rate of ABCA4 retinopathy. Eligibility: People age 12 and older who have ABCA4 retinopathy and have problems with their vision. Design: Participants will be screened under a separate protocol. Participants will have a medical and family history. They will complete a questionnaire about their vision and daily activities. They will have a physical exam. They may have blood drawn through a needle in the arm. Participants will have an eye exam. Their pupils may be dilated with eye drops. Their retina may be photographed. Participants will have a visual field test. They will sit in front of a large dome and press a button when they see a light within the dome. Participants will have an electroretinogram. It examines the function of the retina. They will sit in the dark for 30 minutes. Then their eyes will be numbed with eye drops. They will wear contact lenses that can sense signals from the retinas. They will watch flashing lights. Participants will have optical coherence tomography. This non-invasive procedure makes pictures of the retina. Participants will have fundus autofluorescence. A bright blue light will be shone into their eye. Participants will take metformin by mouth for 24 months. Participants will have study visits every 6 months. Participation will last for at least 36 months....
Eligibility Criteria
* INCLUSION CRITERIA: To be eligible, the following inclusion criteria must be met, where applicable. 1. Participant must be at least 12 years of age. 2. Participant (or legal guardian) must understand and sign the protocol s informed consent document. 3. Participant must have at least one definite pathogenic or likely pathogenic mutation in ABCA4 and a typical clinical presentation of Stargardt disease and phenotypic presentation of ABCA4 retinopathy in both eyes. 4. Participant must have at least two years of natural history data from at least four data points (a) The separation between any two consecutive data points must be at least six months (b) The most recent data point must be at least 4.5 months and no more than 16 months prior to the baseline visit (c) 1. Potential participants with three natural history data points may be enrolled to obtain their fourth natural history data point on protocol. 2. The separation between any two consecutive data points may fall short of 6 months by no more than 45 days; however, the total separation among the data points must allow for at least two years of natural history data. 3. Potential participants with four or more natural history data points completed off protocol, all of which having occurred more than 16 months prior to the baseline visit, may be enrolled to complete an additional natural history data point on protocol within the required timeframe from the baseline visit. 5. Participant must agree to adhere to Lifestyle Considerations throughout study duration. 6. Any female participant of childbearing potential must have a negative urine pregnancy test at screening and be willing to undergo urine pregnancy tests throughout the study. 7. Any female participant of childbearing potential must: * Have had a surgical sterilization OR * Completely abstain from intercourse OR * Practice at least one form of contraception while actively taking IP on the study and at least one week after IP discontinuation OR * Have a partner who had a surgical sterilization OR * Have a partner who practices one form of contraception while the female participant is actively taking IP and at least one week after the female participant discontinues IP. Any male participants must: * Have had a surgical sterilization OR * Completely abstain from intercourse OR * Practice at least one form of contraception while actively taking IP on the study and at least for 3 months after IP discontinuation OR * Have a partner who had a surgical sterilization OR * Have a partner who practices one form of contraception while the male participant actively takes IP and at least 3 months after the male participant discontinues IP. 1. Acceptable forms of surgical sterilization include: vasectomy, hysterectomy, or tubal ligation. 2. Acceptable methods of contraception include: hormonal contraception (i.e., birth control pills, injected hormones, dermal patch or vaginal ring), intrauterine device, or barrier methods (diaphragm, condom) with spermicide. EXCLUSION CRITERIA: An individual who meets any of the following criteria will be excluded from participation in this study: 1. Participant is actively receiving study IP in another investigational study. 2. Participant has a condition that would preclude participation in the study (e.g., unstable medical status including blood pressure and glycemic control) by interfering with the participant s ability to engage in the required protocol evaluation and testing and/or comply with study visits. 3. Any female participant of childbearing potential that is pregnant or breast-feeding at the time of enrollment or planning to become pregnant during the study. 4. Participant has definitive pathogenic or likely pathogenic mutations in RDS/peripherin (PRPH2), PROM1, and/or ELOVL4. 5. Participant has a history of chronic renal impairment as measured in the acute care panel estimated glomerular filtration rate (eGFR)\<45 ml/min/1.73 m2) or severe hepatic, pulmonary, or cardiovascular disease (hypoxic state). 6. Participant is taking any medication that could adversely interact with metformin (e.g., cimetidine, furosemide, nifedipine) and cannot switch to an alternative medication. 7. Participant is currently taking metformin or participant has taken metformin during the period of natural history data collection that will be used for this study for a cumulative total of more than one month (\> 31 days). 8. Participant has a known hypersensitivity to metformin. 9. Participant has not stopped taking a glucagon-like peptide 1 (GLP-1) agonist at least two weeks prior to enrollment or is currently taking a GLP-1 agonist. 10. Participant has a history of chronic lactic acidosis, including diabetic ketoacidosis, with or without coma. 11. Participant has type 1 diabetes mellitus. 12. Scarring due to choroidal neovascularization (CNV) is present in either eye. QUALIFYING EYE ELIGIBILITY CRITERIA: In order to participate in the study, the participant must have at least one qualifying eye that meets all of the inclusion and none of the exclusion criteria listed below. Qualifying Eye Inclusion Criteria: 1\. A growth rate of square root AreaEZloss \> 0.025 mm/year based on calculation from natural history data. Qualifying Eye Exclusion Criteria: 1\. Retinal degeneration has advanced beyond a point where reliable measurement of the integrity of the IS-OS on OCT is possible.
Contact & Investigator
Brian P Brooks, M.D.
PRINCIPAL INVESTIGATOR
National Eye Institute (NEI)
Frequently Asked Questions
Who can join the NCT04545736 clinical trial?
This trial is open to participants of all sexes, aged 12 Years or older, up to 100 Years, studying ABCA4 Retinopathy. Full inclusion and exclusion criteria are listed in the Eligibility Criteria section. Always confirm your eligibility with the research team before applying.
What phase is the NCT04545736 trial and what does that mean for participants?
Phase 1 trials are the first stage of human testing. The primary goal is to assess safety and determine appropriate dosage levels. Participants are closely monitored. These trials typically involve a small number of volunteers.
Is NCT04545736 currently recruiting?
Yes, NCT04545736 is actively recruiting participants. Contact the research team at cathy.kangale-whitney@nih.gov for enrollment information.
Where is the NCT04545736 trial being conducted?
This trial is being conducted at Bethesda, United States, Ann Arbor, United States.
Who is sponsoring the NCT04545736 clinical trial?
NCT04545736 is sponsored by National Eye Institute (NEI). The principal investigator is Brian P Brooks, M.D. at National Eye Institute (NEI). The trial plans to enroll 56 participants.