The growing success of therapeutic interventions (including the antioxidant Vitamin E) for Alzheimer's disease in the general population requires a solution to the methodological problems so that therapeutic trials can be conducted in the aging population with Down syndrome which will ultimately improve their quality of life as well as that of their families and caregivers. The experience gained in this trial will be useful to the design of appropriate cognitive measures of Alzheimer's disease in persons with Down syndrome in subsequent trials.~The goal of this international three-year study is to determine whether the administration of vitamin E, which has been shown to delay the progression of Alzheimer's disease, will slow the rate of cognitive/functional decline in persons age 50 or older with Down syndrome. Persons with Down syndrome functioning at all levels of intellectual disability will be eligible. Men and women of approximately equal numbers and people from minorities and ethnic groups other than Caucasian will be included. A total of 350 individuals with Down syndrome, 50 years of age and older, have been recruited at approximately 21 trial sites. The study is a randomized, double-blind, placebo-controlled, parallel group design with stratification by geographic site and presence of Alzheimer disease according to DSM-IV (American Psychiatric Association) criteria for diagnosing this disease.~Apolipoprotein E (Apo E) genotype will be determined at the screening visit to allow secondary analyses of the impact of Apo E genotype (that may influence Alzheimer's disease risk) on outcome measures and the response to treatment. DNA specimens will also be stored for possible future genetic analyses, with trial sites allowing for non-participation in this procedure. Visits will occur at baseline and then at 6 monthly intervals, with each visit including interval medical history, current and interval medications, side effects checklist, adverse events, pill count, institutionalization status, cognitive, functional, and behavioral measures, and DSM-IV diagnostic assessment for Alzheimer's disease.
The goal of this study is to determine the safety and efficacy of the administration of vitamin E, which has been shown to delay the progression of Alzheimer's disease, in slowing the rate of cognitive/functional decline in older persons with Down syndrome.