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Eisai Gives Full Aduhelm Responsibility To Biogen Under Amended Agreement

Japanese Pharma Trades 50-50 Deal For Single-Digit Royalty

Executive Summary

The companies amended the terms of their Alzheimer’s collaboration to give Biogen full decision-making control over Aduhelm immediately. Eisai’s 50% share of profits and losses from the drug switches to a 2% royalty in 2023. The partners’ agreement for Eisai-led lecanemab remains intact.

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