Tests on brain and spinal fluid could soon mean earlier treatment for Alzheimer’s disease—years before the first symptoms of memory loss, researchers report. Such an early warning test would allow action to prevent or halt the progression of Alzheimer’s while high-risk patients are still cognitively normal. Medications designed to stop Alzheimer’s brain damage have so far failed in clinical trials, possibly, many researchers say, because they are given to patients who already have symptoms and too much damage to overcome.
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