A major trial of a drug to treat mild dementia due to Alzheimer's disease has ended in failure.

Patients on solanezumab did not show any slowing in cognitive decline compared to those treated with a placebo, or dummy drug.

The results of the trial were much anticipated after promising data was released last year.

The phase 3 trial, called EXPEDITION3, involved more than 2,000 patients with Alzheimer's disease.

The drug targeted the build up of amyloid protein, which forms sticky plaques in the brain of patients with Alzheimer's.

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