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Clinical Trial Summary

The primary purpose of this study is to determine whether treatment with lecanemab is superior to placebo on change from baseline of the Preclinical Alzheimer Cognitive Composite 5 (PACC5) at 216 weeks of treatment (A45 Trial) and to determine whether treatment with lecanemab is superior to placebo in reducing brain amyloid accumulation as measured by amyloid positron emission tomography (PET) at 216 weeks of treatment (A3 Trial). This study will also evaluate the long-term safety and tolerability of lecanemab in participants enrolled in the Extension Phase.


Clinical Trial Description

n/a


Study Design


Related Conditions & MeSH terms


NCT number NCT04468659
Study type Interventional
Source Eisai Inc.
Contact Eisai Medical Information
Phone +1-888-274-2378
Email esi_medinfo@eisai.com
Status Recruiting
Phase Phase 3
Start date July 14, 2020
Completion date February 15, 2029

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