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Risk markers for Alzheimer’s disease

22.10.2010
Many proposed drugs for Alzheimer’s disease have been tested, but have not proved good enough. The reason could be because they have been tested on patients who have already developed dementia.

At this point it could be too late to start medication, because the disease is now believed to begin decades before a patient displays clear symptoms. So how can we identify the patients who do not yet have Alzheimer’s, but who are at high risk of developing the disease?

Associate Professor Oskar Hansson, linked to Lund University and Skåne University Hospital in Sweden, has identified two such risk markers. He has tested these on individuals who sought treatment at the hospital’s memory clinic and who displayed ‘mild cognitive impairment’ – poorer memory than normal for their age.

Of the 160 subjects tested, 33 per cent developed Alzheimer’s disease within five years. Sixteen per cent developed other forms of dementia, while the remaining half stayed at the level of ‘mild forgetfulness’. The risk markers made a quite clear distinction between those who would later suffer from Alzheimer’s and those who were not at risk.

“The ‘positive connection’ was 71 per cent, which is not sufficient to definitely predict who will get the disease. The ‘negative connection’, on the other hand, was 94 per cent, which means that it is possible to predict who in all likelihood will not get the disease”, says Oskar Hansson.

Those who do not have the risk markers are therefore not at high risk of developing Alzheimer’s, despite having a poor memory. They can be given this reassuring news and do not have to return for regular Alzheimer’s checks.

Individuals who do not have the risk markers can also be removed from all future clinical studies of new Alzheimer’s drugs.

“The studies are simpler and more correct if they are done on the right patient group from the beginning, i.e. those who really are in the risk zone for Alzheimer’s disease. It is also more ethical not to include patients who are not at risk. They have nothing to gain from the medication, but may have something to lose if the drug causes side-effects”, says Oskar Hansson.

The biomarkers are extracted from spinal fluid through a needle inserted into the lower spine. This is not the same as a bone marrow test, which is a much more extensive and unpleasant procedure.

Incidence of Alzheimer’s disease is increasing rapidly all over the world. In Sweden there are currently around 120 000 people with the disease, but the number is expected to increase in line with the ageing population. Because patients require a lot of care, Alzheimer’s and other forms of dementia are estimated to cost society as much as cardiovascular disease, cancer and stroke combined.

Oskar Hansson’s study has been published in the Journal of Alzheimer's disease and can be found at http://iospress.metapress.com (enter researcher’s full name in search field).

Oskar Hansson can be contacted at oskar.hansson@med.lu.se or on +46 (0)46 176972 or +46 (0)704 417809.

Pressofficer: Ingela Bjröck; +46-46222 7646; ingela.björck@rektor.lu.se

Ingela Björck | idw
Further information:
http://iospress.metapress.com/home/main.mpx

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