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An experimental Alzheimer's drug developed by Eli Lilly and Co slowed cognitive decline by 35% in a late-stage trial, the company said on Wednesday, providing what experts say is the strongest evidence yet that removing sticky amyloid plaques from the brain benefits patients with the fatal disease. Lilly's drug, donanemab, met all goals of the trial, the company said. It slowed progression of Alzheimer's by 35% compared to a placebo in 1,182 people with early-stage disease whose brains had deposits of two key Alzheimer's proteins, beta amyloid as well as intermediate levels of tau, a protein linked with disease progression and brain cell death. The study also evaluated the drug in 552 patients with high levels of tau and found that when both groups were combined, donanemab slowed progression by 29% based on a commonly used scale of dementia progression known as the Clinical Dementia Rating Scale (CDR-SB). Using that scale, experts said Lilly's findings were roughly on par with Eisai Co Ltd and Biogen Inc's lecanemab, sold under the brand name Leqembi, which reduced cognitive decline by 27% in patients with early Alzheimer's in a study published last year. The results drove Lilly's shares to a record high, up more than 6% at $429.85. Dr. Ronald Petersen, an Alzheimer's researcher at Mayo Clinic, said Lilly's trial is the third to show removing amyloid from the brain slows progression of the disease, which could put to rest some lingering doubts about the benefits of drugs in the class and the amyloid-lowering theory. "It's modest, but I think it's real," he said of the benefit, "and I think it's clinically meaningful." Dr. Erik Musiek, a Washington University neurologist at Barnes-Jewish Hospital, said the efficacy looks as good or better than lecanemab.

Diabetes drugs that also promote weight loss such as Novo Nordisk's Ozempic, becoming a darling of celebrities and investors, are being studied to tackle some of the most difficult-to-treat brain disorders, including Alzheimer's disease. Diabetes regimens, from Ozempic to old mainstays like insulin and metformin, appear to address several different aspects of the metabolic system implicated in Alzheimer's disease, including a protein called amyloid and inflammation, researchers say. The hope is that improving glucose utilisation and tamping down inflammation in the entire body - including the brain - could slow progression of debilitating diseases like Alzheimer's and Parkinson's. Several scientists interviewed by Reuters news agency pointed to mounting research supporting testing diabetes drugs against neurodegenerative diseases. Results are years away and success uncertain. But interest has been buoyed by recent positive data on Alzheimer's drugs developed by Eisai with partner Biogen and by Eli Lilly demonstrating that removing sticky amyloid plaques accumulated in the brain can slow cognition decline caused by the fatal mind-wasting disease. Those successes followed decades of futility that had left many questioning the validity of the amyloid theory behind most experimental Alzheimer's drugs.

The first big breakthrough in 30 years of Alzheimer's research is providing momentum for clinical trials of "cocktail" treatments targeting the two hallmark proteins associated with the mind-robbing disease, according to interviews with researchers and pharmaceutical executives. Drugmakers Eisai and Biogen reported in September that their therapy lecanemab could slow progress of the disease by 27% over 18 months compared with a placebo. The finding validates the theory that clearing the amyloid protein that forms clumps in the brains of Alzheimer's patients could slow or halt the disease and has strengthened the support from some scientists for simultaneously targeting another notorious protein linked to Alzheimer's: tau. Eisai and Biogen are scheduled to present full data from their lecanemab study on Tuesday at the Clinical Trials on Alzheimer's Disease conference in San Francisco. The U.S. Food and Drug Administration is expected to make a decision by early January on the companies' application for accelerated approval. If approved on an accelerated basis, the companies said they would immediately apply for full U.S. regulatory approval which could help secure Medicare coverage.