The absence of an apolipoprotein ϵ4 allele is associated with a more aggressive form of Alzheimer's disease

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<jats:title>Abstract</jats:title><jats:p>We investigated the relationship between APOE genotype and rate of disease progression and survival in 99 patients with probable Alzheimer's disease (AD) who were followed biannually for up to 6 years. Patients were stratified into two groups, those with and without at least one APOE ϵ4 allele. The rate of decline in modified Mini‐Mental State Examination scores was slower, the presence of extrapyramidal signs was decreased, and the development of myoclonus occurred later among patients with APOE ϵ4 alleles compared with patients with other genotypes. Compared with patients with other genotypes. Compared with patients without an APOE ϵ4 allele, the risk of mortality was also decreased in patients with at least one ϵ4 allele (<jats:italic>RR</jats:italic> = 0.38; CI = 0.17−0.84, <jats:italic>P</jats:italic> < 0.02). Because the decline in mental ability as well as the development of myoclonus and extrapyramidal signs are consistent manifestations of disease progression, our results imply that APOE ϵ4 is associated with a less aggressive form of AD.</jats:p>

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