First trial to stop Alzheimer's before symptoms emerge
Most research into dementia is about finding treatments for people who are already affected by symptoms.
But a trial is under way in London which aims to prevent Alzheimer's in people at high risk, before they show any physical signs of the disease.
These people have at least a 50-50 chance of carrying a rare genetic mutation which means they will develop the disease early in life - typically in their 30s or 40s.
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