Risk markers for Alzheimer’s disease

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?

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