Eisai Clinical Trials

A Placebo-Controlled, Double-Blind, Parallel-Group, 18-Month Study With an Open-Label Extension Phase to Confirm Safety and Efficacy of BAN2401 in Subjects With Early Alzheimer’s Disease

BAN2401-G000-301

Study Overview

BAN2401
lecanemab
NCT03887455, 2018-004739-58, 2024-510887-22, jRCT2081214685, JapicCTI-194759
Mar 2019 -
Early Alzheimer's Disease
1. Core Study: Change from Baseline in the CDR-SB at 18 Months [Time Frame: Baseline, 18 months]

2. Extension Phase: Number of Participants Reporting One or More Treatment-emergent Adverse Events (TEAEs) [Time Frame: From first dose of study drug up to approximately 51 months (including 3 months follow up) for the extension phase]

3. Extension Phase: Change from Core Study Baseline in CDR-SB [Time Frame: Baseline up to Month 66]

4. Extension Phase Part B: Number of Participants Exposed to Lecanemab [Time Frame: From 48th month in extension phase part A to the end of extension phase part B (up to 24 months)]

  • Males and females 50 Years to 90 Years (Adult, Older Adult)

  • Active, not recruiting

  • Phase 3

  • Australia, Canada, China, France, Germany, Italy, Japan, Korea, Republic of, Russian Federation, Singapore, Spain, Sweden, United Kingdom, United States See more

Clinical Trial Documents

Clinical Study Report Synopsis

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Plain Language Protocol Synopsis (PLPS)

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Plain Language Summary of Results (PLS)

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Publication reference citation

Devanarayan V, Ye Y, Zhu L, Tian L, Kramer L, Irizarry M, Dhadda S. Predicted natural progression as an Alzheimer’s prognostic covariate improves the precision of lecanemab efficacy assessments and clinical trial efficiency. Alzheimers Dement. 2025 Mar;21(3):e70045. doi: 10.1002/alz.70045.

Devanarayan V, Charil A, Horie K, Doherty T, Llano DA, Andreozzi E, Sachdev P, Ye Y, Murali LK, Zhou J, Reyderman L, Hampel H, Kramer LD, Dhadda S, Irizarry MC; Alzheimer’s Disease Neuroimaging Initiative (ADNI). Plasma pTau217 ratio predicts continuous regional brain tau accumulation in amyloid-positive early Alzheimer’s disease. Alzheimers Dement. 2025 Feb;21(2):e14411. doi: 10.1002/alz.14411. Epub 2024 Nov 22.

Devanarayan V, Doherty T, Charil A, Sachdev P, Ye Y, Murali LK, Llano DA, Zhou J, Reyderman L, Hampel H, Kramer LD, Dhadda S, Irizarry MC. Plasma pTau217 predicts continuous brain amyloid levels in preclinical and early Alzheimer’s disease. Alzheimers Dement. 2024 Aug;20(8):5617-5628. doi: 10.1002/alz.14073. Epub 2024 Jun 28.

Honig LS, Sabbagh MN, van Dyck CH, Sperling RA, Hersch S, Matta A, Giorgi L, Gee M, Kanekiyo M, Li D, Purcell D, Dhadda S, Irizarry M, Kramer L. Updated safety results from phase 3 lecanemab study in early Alzheimer’s disease. Alzheimers Res Ther. 2024 May 10;16(1):105. doi: 10.1186/s13195-024-01441-8.

Data Sharing

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CSDR Sharing is not available for this study.

CSDR Availability
Clinical Trial Data

Redacted documents may be available upon request for this study.

Document type Availability
Protocol
SAP
Sample CRF
Full CSR