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Changes seen in cerebrospinal fluid levels before onset of Alzheimer dementia
Date:1/2/2012

CHICAGO Cerebrospinal fluid levels of Aβ42 appear to be decreased at least five to 10 years before some patients with mild cognitive impairment develop Alzheimer disease (AD) dementia whereas other spinal fluid levels seem to be later markers of disease, according to a report in the January issue of Archives of General Psychiatry, one of the JAMA/Archives journals.

The researchers note as background in the study that disease-modifying therapies, such as immunotherapy, are more likely to be successful if started in the early stages of the disease so there is a need to identify patients with Alzheimer disease before neurodegeneration is not too severe.

Peder Buchhave, M.D., Ph.D, who is affiliated with Lund University and Skane University, Sweden, and colleagues conducted an extended follow-up of the cohort from a previous study of 137 patients with mild cognitive impairment (MCI) at baseline. The median follow-up was 9.2 years.

During the follow-up, 72 patients (53.7 percent) developed AD and 21 (15.7 percent) progressed to other forms of dementia. At the baseline, cerebrospinal fluid Aβ42 levels were reduced and other biomarkers T-tau and P-tau levels were elevated in patients who converted to AD during follow-up compared with levels in patients who did not develop AD.

The study indicates baseline CSF Aβ42 levels were equally reduced in patients with MCI who converted to AD within five years (the early converters) compared to those who converted later between five and 10 years. However, T-tau and P-tau levels were significantly higher in early converters compared to later ones.

Researchers suggest that "approximately 90 percent of patients with MCI and pathologic CSF biomarkers at baseline will develop AD within 9.2 years."

"Therefore, these markers can identify individuals at high risk for future AD least five to 10 years before conversion to dementia. Hopefully, new therapies that ca
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Contact: Oskar Hansson, M.D., Ph.D.
oskar.hansson@med.lu.se
JAMA and Archives Journals
Source:Eurekalert

Page: 1 2

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