Biogen and Eisai Co. Ltd. announced a decision on 13 September that seemed inevitable after many failures in the same drug class: the companies said they will discontinue two Phase III clinical trials (MISSION AD1 and AD2) for the beta amyloid cleaving enzyme (BACE) inhibitor elenbecestat in Alzheimer’s disease after a safety review by the data safety monitoring board observed an unfavorable risk-benefit ratio.
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