
Am J Psychiatry 156:50-57, January 1999
©Copyright 1999 American Psychiatric Association
Prospective Study of Risk Factors for Alzheimer's Disease: Results at 7.5 Years
George S. Zubenko, M.D., Ph.D.,
Ethel Winwood, R.N.,
Barbara Jacobs, B.S.N., M.Ed.,
Ivana Teply, M.S.,
J. Scott Stiffler, B.S.,
Hugh B. Hughes III, M.S.,
F. Jacob Huff, M.D.,
Trey Sunderland, M.D., and
A. Julio Martinez, M.D.
OBJECTIVE: The primary goal of this study was to evaluate increased platelet membrane fluidity as a putative risk factor for Alzheimer's disease and its relationship to the APOE 4 genotype. METHOD: This report describes the results of a prospective, longitudinal study of 330 initially asymptomatic, first-degree relatives of probands with Alzheimer's disease. RESULTS: Nine incident cases of Alzheimer's disease were detected during the first 2,220 subject-years of the follow-up period. Age, increased platelet membrane fluidity, and the APOE 4 allele made significant independent contributions to the risk of developing Alzheimer's disease, while sex and years of education did not. Increased platelet membrane fluidity was associated with incident Alzheimer's disease cases between the ages of 64 and 71, while the 4 allele was associated with incident Alzheimer's disease cases from age 64 until at least age 80. CONCLUSIONS: These results indicate that increased platelet membrane fluidity is not produced by the APOE 4 allele. Instead, increased platelet membrane fluidity and the 4 allele appear to make significant independent contributions to the risk of developing Alzheimer's disease among the first-degree relatives of patients with this disorder. Moreover, the age ranges over which these risk factors operate appear to be different.
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