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Neuropsychological assessment more efficient than MRI for tracking disease progression
Date:2/18/2014

Amsterdam, NL, February 18, 2014 Investigators at the University of Amsterdam, The Netherlands, have shown that progression of disease in memory clinic patients can be tracked efficiently with 45 minutes of neuropsychological testing. MRI measures of brain atrophy were shown to be less reliable to pick up changes in the same patients.

This finding has important implications for the design of clinical trials of new anti-Alzheimer drugs. If neuropsychological assessment is used as the outcome measure or "gold standard," fewer patients would be needed to conduct such trials, or the trials may be of shorter duration.

The US Food and Drug Administration and its counterparts in other countries, such as the European Medicines Agency, require that pharmaceutical companies test and prove the effectiveness of new drugs through experimental studies. In the case of Alzheimer's disease, this means amelioration of cognitive and behavioral symptoms or at least slowing down the rate of cognitive and behavioral decline. Until now the outcome measures in this type of research have been cognitive and behavioral rating scales, such as the Alzheimer Disease Assessment Scale (ADAS). If the effect of a new drug cannot be demonstrated with such a scale, the drug will not be approved.

The problem with scales like the ADAS is that they are quite crude and cannot pick up subtle changes, especially in early stages of the disease. As an alternative, MRI measures of brain atrophy have been proposed as outcome in clinical trials, because of allegedly better properties to detect subtle changes. This implies that fewer patients are needed in clinical trials of new drugs to show a treatment effect.

The Dutch investigators tested this claim at the memory clinic of the Academic Medical Centre, University of Amsterdam, by comparing neuropsychological assessment and MRI measures of brain atrophy in 62 patients with no or early cognitive impairment, but no dem
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Contact: Daphne Watrin
d.watrin@iospress.nl
31-206-883-355
IOS Press
Source:Eurekalert

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