- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00000114
Randomized Trial of Vitamin A and Vitamin E Supplementation for Retinitis Pigmentosa
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Retinitis pigmentosa (RP) is a group of inherited retinal degenerations with a worldwide prevalence of about 1 in 4,000. Patients typically report night blindness in adolescence and lose vision in the midperipheral followed by far-peripheral visual field in adulthood due to progressive loss of both rod and cone function. Most patients have reductions in central vision by age 50 to 80 years. Modern-day electroretinograms (ERGs) make it possible to record retinal responses from most patients with remaining vision and thereby monitor objectively the course of their disease.
While the natural course of retinal degeneration in the common forms of RP was being studied, it was noted that a subgroup of patients aged 18 through 49 who were treating themselves with both vitamin A and vitamin E and other nutritional supplements exhibited less decline in ERG amplitude over a 2-year period. These preliminary findings, as well as the known roles of vitamins A and E in maintaining normal photoreceptor function and structure, prompted this randomized, controlled trial to determine whether these vitamins alone or in combination would halt or slow the progression of the common forms of RP.
This study was a randomized, controlled double-masked trial with 2 x 2 factorial design and duration of 4 to 6 years. Patients were assigned to one of four treatment groups:
15,000 IU/day vitamin A
15,000 IU/day vitamin A + 400 IU/day vitamin E
trace amounts of both vitamins A and E
400 IU/day of vitamin E
The main outcome measure was the 30-Hz cone ERG amplitude. In addition, visual field and visual acuity were measured annually.
Study Type
Phase
- Phase 3
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Factorial Assignment
- Masking: Double
Collaborators and Investigators
Sponsor
Publications and helpful links
General Publications
- Berson EL, Rosner B, Sandberg MA, Hayes KC, Nicholson BW, Weigel-DiFranco C, Willett W. A randomized trial of vitamin A and vitamin E supplementation for retinitis pigmentosa. Arch Ophthalmol. 1993 Jun;111(6):761-72. doi: 10.1001/archopht.1993.01090060049022.
- Sandberg MA, Weigel-DiFranco C, Rosner B, Berson EL. The relationship between visual field size and electroretinogram amplitude in retinitis pigmentosa. Invest Ophthalmol Vis Sci. 1996 Jul;37(8):1693-8.
Study record dates
Study Major Dates
Study Start
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Eye Diseases
- Retinal Degeneration
- Retinal Diseases
- Genetic Diseases, Inborn
- Eye Diseases, Hereditary
- Retinal Dystrophies
- Retinitis
- Retinitis Pigmentosa
- Physiological Effects of Drugs
- Molecular Mechanisms of Pharmacological Action
- Protective Agents
- Micronutrients
- Antioxidants
- Vitamin E
- Vitamins
- Vitamin A
Other Study ID Numbers
- NEI-10
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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