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Clear evidence this week that Eisai and Biogen’s drug lecanemab slows cognitive decline in early stage dementia has galvanized efforts among Alzheimer’s researchers toward a tantalizing goal – preventing dementia even before symptoms start.

Today’s promising results from Eisai and Biogen’s Alzheimer’s drug trial have reignited decades-old hopes that targeting a particular protein helps arrest the progression of the fatal brain disease, giving a big boost to similar studies being run by Roche and Eli Lilly.