BASEL, July 30 -- Swiss drugmaker Roche Holding plans to investigate whether an experimental medicine can delay or prevent Alzheimer's disease symptoms, it said on Sunday, as a part of the company's growing development programme for the disease.

The clinical trial of the drug, Trontinemab, will target people who are at risk of cognitive decline and will aim to delay or prevent the symptoms of Alzheimer's, Roche said in a statement.

Trontinemab is designed so that the drug is transported across the blood brain barrier - protective blood vessels that prevent chemicals in the bloodstream from entering the brain - in hopes of delivering more of the treatment to the brain.

Rivals like Eli Lilly have been making progress in the complicated f...