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Lecanemab/kg

Phase 2

Alzheimer's Disease | Small molecule | Neurology |Biogen Inc.|Last Updated: Mar 4, 2026

Target and mechanism

Molecular targetAPP
Target classInhibitor
ModalitySmall molecule

Also known as Lecanemab, Lecanemab IV

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment856

FDA Designations

PRIORITY_REVIEWFAST_TRACKACCELERATED_APPROVAL

Clinical trial landscape

Lecanemab/kg · 1 trial · 1 indication

Phase 2 1
NCT01767311A Study to Evaluate Safety, Tolerability, and Efficacy of Lecanemab in Subjects With Early Alzheimer's DiseaseAlzheimer's Disease
COMPLETED856 Analytics
PHASE2COMPLETED
A Study to Evaluate Safety, Tolerability, and Efficacy of Lecanemab in Subjects With Early Alzheimer's Disease
Alzheimer's DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Core Study Phase: Change From Baseline in Alzheimer's Disease Composite Score (ADCOMS) at Month 12
Core Study Phase: at Month 12

The ADCOMS is a composite score that comprises 4/14 items from the Alzheimer's Disease Assessment Scale-cognitive subscale (ADAS-cog), 2 items from the Mini Mental State Examination (MMSE), and all items from the Clinical Dementia Rating (CDR). Composite score is derived from the variables from the 12 items, and ranges from 0 to 1.97, where higher score means greater impairment. Change from baseline was analyzed using Bayesian analysis. Data presented are posterior mean and posterior standard deviation.

Core Study Phase: Number of Participants With All Treatment Emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs)
From first dose of the study drug (Week 1) up to 90 days after last dose of study drug (up to 21 months)

A TEAE is defined as an AE that emerged during treatment or within 90 days following the last dose of study drug, having been absent at pretreatment (Baseline) or reemerged during treatment, having been present at pretreatment (Baseline) but stopped before treatment, or worsened in severity during treatment relative to the pretreatment state, when the AE was continuous. A SAE is any untoward medical occurrence that at any dose: results in death; is life-threatening (that is, the participant is at immediate risk of death from the adverse event as it occurs, this does not include an event that, has it occurred in a more severe form or is allowed to continue, might have cause death); requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability or incapacity; is a congenital anomaly or birth defect (in the child of a participant who is exposed to the study drug).

OLE Phase: Number of Participants With All TEAEs and SAEs
From first dose of the study drug (Week 1) up to 30 days after last dose of study drug (up to 61 months)

A TEAE is defined as an AE that emerged during treatment or within 30 days following the last dose of study drug, having been absent at pretreatment (Baseline) or reemerged during treatment, having been present at pretreatment (Baseline) but stopped before treatment, or worsened in severity during treatment relative to the pretreatment state, when the AE was continuous. A SAE is any untoward medical occurrence that at any dose: results in death; is life-threatening (that is, the participant is at immediate risk of death from the adverse event as it occurs, this does not include an event that, has it occurred in a more severe form or is allowed to continue, might have cause death); requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability or incapacity; is a congenital anomaly or birth defect (in the child of a participant who is exposed to the study drug).

Secondary Endpoints

Core Study Phase: Change From Baseline at Months 12 and 18 in Brain Amyloid Pathophysiology as Measured by Amyloid Positron Emission Tomography (PET)
Core Study Phase: at Months 12 and 18
Core Study Phase: Change From Baseline in ADCOMS at Month 18
Core Study Phase: at Month 18
Core Study Phase: Change From Baseline in Clinical Dementia Rating- Sum of Boxes (CDR-SB) at Months 12 and 18
Core Study Phase: at Months 12 and 18
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Core Study: Lecanemab 2.5 mg/kg biweeklyEXPERIMENTAL2.5 mg/kg biweekly
Core Study: Lecanemab 5.0 mg/kg biweeklyEXPERIMENTAL5.0 mg/kg biweekly
Core Study: Lecanemab 10 mg/kg biweeklyEXPERIMENTAL10 mg/kg biweekly
Core Study: Lecanemab 5.0 mg/kg monthlyEXPERIMENTAL5.0 mg/kg monthly
Core Study: Lecanemab 10 mg/kg monthlyEXPERIMENTAL10 mg/kg monthly
Core Study: Lecanemab-matched PlaceboPLACEBO_COMPARATORMatching placebo biweekly
Extension Phase: Lecanemab 10 mg/kgEXPERIMENTALAll participants who fulfill Extension Phase inclusion and exclusion criteria will have the option to participate in the Extension Phase to receive lecanemab 10 mg/kg biweekly for up to 60 months or until the benefit-to-risk ratio from treatment with lecanemab is no longer considered favorable, whichever comes first. Additionally, participants who have received Extension Phase treatment for at least 18 months may opt to enter the dosing regimen substudy during which they will receive either lecanemab 10 mg/kg once every 4 weeks (Q4W) or once every 3 months (Q3M).

Interventions

NameTypeDescription
Lecanemab 2.5 mg/kgDRUG2.5 mg/kg biweekly (once every 2 weeks) administered as i.v. infusion
Lecanemab 5.0 mg/kgDRUG5.0 mg/kg biweekly (once every 2 weeks) administered as i.v. infusion
Lecanemab 10 mg/kgDRUG10 mg/kg biweekly (once every 2 weeks) administered as i.v. infusion.
PlaceboDRUGbiweekly (once every 2 weeks) administered as i.v. infusion
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Eligibility Criteria

Age Range50 Years to 90 Years
SexALL
Healthy VolunteersNo
Study Sites169

Key Inclusion Criteria (Core Study) for Mild Cognitive Impairment due to Alzheimer's Disease \- Intermediate likelihood: 1. Subjects who meet the National Institute of Aging - Alzheimer's Association (NIA-AA) core clinical criteria for mild cognitive impairment due to Alzheimer's disease - interme...

Countries:United StatesCanadaFranceGermanyItalyJapanNetherlandsSouth KoreaSpainSwedenUnited Kingdom
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Frequently asked questions about Lecanemab/kg

What is Lecanemab used for?

Lecanemab is an investigational antibody being studied for the treatment of Alzheimer's disease, including early Alzheimer's disease and preclinical Alzheimer's disease. It is being developed by Biogen Inc. (BIIB) and is currently in Phase 3 clinical trials.

What does Lecanemab target?

Lecanemab is a monoclonal antibody, indicated by its -mab suffix. It is designed to target amyloid beta, a protein that accumulates in the brains of people with Alzheimer's disease. By binding to amyloid beta, Lecanemab aims to clear these plaques and potentially slow disease progression.

Who makes Lecanemab?

Lecanemab is being developed by Biogen Inc., a biotechnology company traded on the NASDAQ under the ticker symbol BIIB. Biogen is conducting Phase 3 clinical trials to evaluate the safety and efficacy of Lecanemab in patients with early and preclinical Alzheimer's disease.

What phase is Lecanemab in?

Lecanemab is in Phase 3 clinical development. It has received FDA designations including Priority Review, Fast Track, and Accelerated Approval, indicating its potential to address an unmet medical need in Alzheimer's disease. However, it remains investigational and has not yet been approved.

What clinical trials is Lecanemab in?

Lecanemab is being studied in several clinical trials. NCT03887455 is a Phase 3 study in early Alzheimer's disease with 1906 participants. NCT04468659 is a Phase 3 study in preclinical Alzheimer's disease with 1400 participants. NCT01767311, a completed Phase 2 study, enrolled 856 participants with Alzheimer's disease.

Is Lecanemab the same as Lecanemab IV?

Yes, Lecanemab is also known as Lecanemab IV, referring to its intravenous route of administration. Both names refer to the same investigational drug being developed by Biogen for the treatment of Alzheimer's disease.