Up­dat­ed: Ei­sai says Alzheimer's drug keeps work­ing af­ter three years. But weak­ness­es in study raise ques­tions

PHILADEL­PHIA — Ever since Ei­sai first re­vealed da­ta from its piv­otal Alzheimer’s dis­ease study two years ago, the com­pa­ny has ar­gued that treat­ing pa­tients with Leqem­bi …

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