A new Alzheimer's treatment may help some patients, though researchers say more safety data is needed

A new study found that Eisai and Biogen’s experimental Alzheimer’s drug moderately reduced cognitive decline after a year and a half.

Eisai’s 4523, +1.82% stock was up 1.7%% in Wednesday morning trading in Japan, while shares of Biogen Inc. BIIB, -0.17% gained 0.9% in after-hours trading on Tuesday in the U.S.

Eisai also presented the full findings from the trial on Tuesday night at the Clinical Trials on Alzheimer’s Disease annual meeting in San Francisco. A Biogen spokesperson said in a statement that the randomized, placebo-controlled, double-blind Phase 3 clinical trial shows “the promise of lecanemab as a potential new treatment option.”

The companies said deaths occurred in 0.7% and 0.8%, respectively, of the participants in the lecanemab and placebo groups, though none were related to lecanemab. There have been two reports of deaths in the trial.

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