Idebenone treatment fails to slow cognitive decline in Alzheimer's disease.

Abstract

OBJECTIVE:

To determine the effect of idebenone on the rate of decline in Alzheimer's disease (AD).

METHODS:

A 1-year, multicenter, double-blind, placebo-controlled, randomized trial was conducted. Subjects were over age 50 with a diagnosis of probable AD and had Mini-Mental State Examination (MMSE) scores between 12 and 25. Subjects were treated with idebenone 120, 240, or 360 mg tid, each of which was compared with placebo. Primary outcome measures were the Alzheimer's Disease Assessment Scale-Cognitive Subcomponent (ADAS-Cog) and a Clinical Global Impression of Change (CGIC). Secondary outcome measures included measurements of activities of daily living, the Behavioral Pathology in Alzheimer's Disease Rating Scale, and the MMSE.

RESULTS:

Five hundred thirty-six subjects were enrolled and randomized to the four groups. Except for a slight difference in age, there were no differences in patient characteristics at baseline. For the primary outcome measures, there were no significant overall differences between the treatment groups in the prespecified four-group design. In an exploratory two-group analysis comparing all three treated groups combined with placebo, drug-treated patients performed better on the ADAS-Cog in both the intent-to-treat (ITT) and completers analyses. There were no differences in the CGIC scores for the ITT or completers analyses in either the four-group or the two-group analyses. There were no overall differences on any of the secondary outcome measures in any of the analyses.

CONCLUSION:

Idebenone failed to slow cognitive decline in AD that was of sufficient magnitude to be clinically significant.

• Authors: L J Thal, M Grundman, J Berg, K Ernstrom, R Margolin, E Pfeiffer, M F Weiner, E Zamrini, R G Thomas
• Journal: Neurology (Neurology) Vol. 61 Issue 11 Pg. 1498-502 (Dec 09 2003) ISSN: 1526-632X [Electronic] United States
• PMID: 14663031 (Publication Type: Clinical Trial, Journal Article, Multicenter Study, Randomized Controlled Trial, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Benzoquinones
• Ubiquinone
• idebenone

Topics

• Aged
• Alzheimer Disease (diagnosis, drug therapy)
• Benzoquinones (adverse effects, therapeutic use)
• Cognition Disorders (drug therapy)
• Disease Progression
• Double-Blind Method
• Female
• Humans
• Male
• Middle Aged
• Treatment Failure
• Ubiquinone (analogs & derivatives)