Although the product has been shown to be safe, there is no evidence whatsoever that it should be taken by anyone who does not have mild or early stage Alzheimer's disease, Hughes said.

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When it learned of these results Myriad switched its focus from cancer to Alzheimer's disease and began a trial of 210 men and women with mild to moderate Alzheimer's symptoms.

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Meanwhile, the Allon Therapeutics drug helped improve some measures of short-term memory in patients with mild cognitive impairment, a condition that often leads to Alzheimer's disease.

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