VITAL - VITamins to Slow ALzheimer's Disease (Homocysteine Study)
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|ClinicalTrials.gov Identifier: NCT00056225|
Recruitment Status : Completed
First Posted : March 10, 2003
Last Update Posted : June 12, 2009
|Condition or disease||Intervention/treatment||Phase|
|Alzheimer's Disease||Drug: Folate Drug: Vitamin B6 Drug: Vitamin B12||Phase 3|
Blood levels of homocysteine are elevated in Alzheimer's disease (AD), and hyperhomocysteinemia may contribute to disease pathophysiology by vascular and direct neurotoxic mechanisms. Homocysteine levels can be reduced by administration of high dose supplements of folate (folic acid) and vitamins B6 and B12. The proposed study is for a multicenter, randomized, controlled clinical trial to determine whether reduction of homocysteine levels with high-dose folate/B6/B12 supplementation will slow the rate of cognitive decline in subjects with AD.
This will be a parallel design study, including two groups of unequal size: 60% of subjects will receive daily high-dose supplements (folate 5mg, vitamin B6 25mg, vitamin B12 1 mg), and 40% will receive an identical looking placebo. The duration of treatment will be 18 months, and participants will make eight visits to the assigned study site for safety and efficacy assessments of the medications. The primary outcome measure will be the longitudinal decline in the ADAScog, a psychometric instrument that evaluates memory, attention, reasoning, language, orientation and praxis (Rosen et al 1984). To power the trial to detect a 25% reduction in rate of ADAScog decline (80% power, alpha=0.05, drop-out estimate 20%, drop-in estimate 10%), it will enroll a total of 400 participants. Persons of minority racial groups are also being recruited, although all participants must be able to speak either English or Spanish.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||340 participants|
|Intervention Model:||Parallel Assignment|
|Official Title:||High Dose Supplements to Reduce Homocysteine and Slow the Rate of Cognitive Decline in Alzheimer's Disease (Vitamins to Slow Alzheimer's - VITAL)|
|Study Start Date :||January 2003|
|Actual Primary Completion Date :||June 2007|
|Actual Study Completion Date :||June 2007|
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00056225
Show 38 Study Locations
|Principal Investigator:||Paul Aisen, MD||Georgetown University, Department of Neurology|