This trial is active, not recruiting.

Condition alzheimer disease
Treatments alphatocopherol, selenium, placebo replacement for vitamin e, placebo replacement for selenium
Phase phase 3
Sponsor University of Kentucky
Collaborator National Institute on Aging (NIA)
Start date May 2002
End date January 2014
Trial size 10400 participants
Trial identifier NCT00040378, 5R01AG019241, IA0033, NCT00780689


The Prevention of Alzheimer's Disease by Vitamin E and Selenium (PREADVISE) prevention trial is an important addition to the Selenium and Vitamin E Cancer Prevention Trial (SELECT). As a prevention trial, PREADVISE is trying to find out if taking selenium and/or Vitamin E supplements can help to prevent memory loss and dementia such as Alzheimer's disease.

United States No locations recruiting
Other countries No locations recruiting

Study Design

Allocation randomized
Endpoint classification efficacy study
Intervention model factorial assignment
Masking double blind (subject, caregiver, investigator)
Primary purpose prevention
vitamin E and selenium
alphatocopherol Vitamin E
400 IU daily
200mcg daily
vitamine E and placebo
alphatocopherol Vitamin E
400 IU daily
placebo replacement for selenium
1 placebo pill daily
selenium and placebo
200mcg daily
placebo replacement for vitamin e
1 placebo pill daily
(Placebo Comparator)
placebo and placebo
placebo replacement for vitamin e
1 placebo pill daily
placebo replacement for selenium
1 placebo pill daily

Primary Outcomes

Effect on the incidence of dementia (including Alzheimer's disease) over time
time frame: 7 to 12 years (depending on enrollment date)

Eligibility Criteria

Male participants from 60 years up to 90 years old.

Inclusion Criteria

  • Participating in SELECT Prevention study;
  • 62 years or older if other ethnic origin, or 60 years or older if African-American or Hispanic;
  • General good health with no neurological or psychiatric illness.

Exclusion Criteria

  • Alzheimer's disease, or any other form of dementia such as Pick's disease, dementia with Lewy bodies, frontotemporal dementia, vascular dementia, significant cognitive and motor impairment from a stroke or corticobasal degeneration;
  • Huntington's disease, epilepsy, Parkinson's disease, brain tumor, multiple sclerosis, manic-depressive disorder, or schizophrenia;
  • The participant must not have had a head injury with prolonged loss of consciousness (over 30 minutes) within the past five years;
  • The participant must not have a current alcohol or substance abuse diagnosis, or must have been treatment free for the past 24 months;
  • The participant must not have had a diagnosis of depression or anxiety disorder in the past 4 months and must not currently be under treatment for depression or anxiety disorder. [A participant who was previously diagnosed with depression or anxiety disorder but completed treatment more than four months ago is eligible.];
  • The participant must not currently use of any of the following medications: Aricept, Cognex, Exelon, Reminyl, or Hydergine;
  • The participant must not have blindness, deafness, language difficulties or any other disability that may prevent completion of the memory screen.

Additional Information

Official title Prevention of Alzheimer's Disease by Vitamin E and Selenium (PREADVISE)
Principal investigator Frederick Schmitt, PhD
Description Studies show that increased oxidative stress (from excess free radicals) may damage brain cells and is linked with Alzheimer's disease (AD). Many studies show increased oxidation of brain lipids (fats), proteins, carbohydrates (sugars) and DNA in AD. Although the causes of AD are not known, it is believed that oxidative stress is part of what damages brain cells in AD and probably other brain diseases. Animal and tissue culture studies of vitamin E and selenium suggest that they can protect brain cells from damage. This research study is being done to see how safe and effective vitamin E and selenium may be in preventing AD and other brain illnesses. These illnesses are more common in people over the age of 60 to 65. A potential benefit of participating in the PREADVISE study is that early detection of memory changes can lead to early diagnosis and treatment. Also, some participants may decrease their risk of getting AD if the supplements are effective. The findings of this study may also help in the research and understanding of AD. Only participants who are taking part in the SELECT study (a study that looks at the use of vitamin E and selenium for preventing prostate cancer) may apply to participate in the PREADVISE study about how useful vitamin E and selenium might be for preventing memory changes with age (including Alzheimer's disease and other disease that can affect the brain). African American and Hispanic men who are age 60 or older may take part. Men of other ethnic groups aged 62 or older may take part. The SELECT doctors or staff will review the applicant's medical history and drugs to verify that they have no conditions that would exclude them from this study. About 10,000 men will take part in this study. The PREADVISE study examinations will be done during the participant's annual SELECT visit at the clinic where the SELECT studies are being conducted. There will be one study visit for each year the participants are in SELECT (7 to 12 visits). Each visit for PREADVISE will consist of a brief screening of the participant's memory, and an update (if any) of the participant's family history of dementia and medications. If memory changes are suggested by the brief memory screen, the participant will be asked to take a longer memory screen to further evaluate the potential for memory changes. If the longer memory screen also suggests problems with the participant's memory, the participant will be asked to see his family doctor or a PREADVISE doctor for a more complete medical exam to find the possible causes of the memory change. Results of the doctor's medical exam, with the consent of the participant, will be sent to the PREADVISE doctors for their review to help with the diagnosis. Results of the memory checks will not be given to the participants. However, if the participant does have a medical workup for memory changes, this information will be given to the family doctor after the medical workup is completed. A portion of the blood sample that was taken when the participant entered SELECT might be analyzed and tested for a genetic risk factor associated with Alzheimer's disease, called Apolipoprotein E (ApoE). The results of this test will be used for research purposes only.
Trial information was received from ClinicalTrials.gov and was last updated in February 2013.
Information provided to ClinicalTrials.gov by University of Kentucky.