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LY3439539

Phase 1

Alzheimer Disease | Small molecule | Neurology |Eli Lilly and Company|Last Updated: Sep 4, 2026

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment30

FDA Designations

No designations recorded

Clinical trial landscape

LY3439539 · 1 trial · 1 indication

Phase 1 1
NCT07598370A Study of LY3439539 in Participants With Alzheimer's DiseaseAlzheimer Disease
RECRUITING30 Analytics
PHASE1RECRUITING
A Study of LY3439539 in Participants With Alzheimer's Disease
Alzheimer DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Change from Baseline in Cerebrospinal Fluid (CSF) Neurofilament Light Chain (NfL)
Baseline through end of the Follow-up Period (Week 24)

Secondary Endpoints

Change from Baseline in Phospho-Tau (pTau)
Baseline through end of the Follow-up Period (Week 24)
Change from Baseline in Plasma NfL
Baseline through end of the Follow-up Period (Week 24)
Pharmacokinetics (PK) Maximum LY3439539 Serum Concentration (Cmax)
Baseline through end of the Follow-up Period (Week 24)
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeBASIC_SCIENCE

Treatment Arms

ArmTypeDescription
LY3439539EXPERIMENTALLY3439539 administered intravenously (IV)

Interventions

NameTypeDescription
LY3439539DRUGAdministered IV
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Eligibility Criteria

Age Range50 Years to 85 Years
SexALL
Healthy VolunteersNo
Study Sites11

Inclusion Criteria: * Have gradual and progressive change in memory function reported by the participant or informant for 6 months or longer consistent with a diagnosis of dementia due to Alzheimer's disease * Have a Mini Mental Score Examination score of 16 to 24, inclusive * Meet plasma pTau crit...

Countries:United StatesAustraliaNew ZealandSingapore
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Recent Changes (Last 90 Days)

LOWSep 4, 2026NCT07598370lastUpdatePostDate: changed
LOWAug 7, 2026NCT07598370lastUpdatePostDate: changed
LOWAug 7, 2026NCT07598370lastUpdatePostDate: changed
MEDIUMJul 20, 2026NCT07598370primaryCompletionDate: changed
MEDIUMJul 20, 2026NCT07598370primaryCompletionDate: changed
LOWJun 16, 2026NCT07598370Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 16, 2026NCT07598370Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 16, 2026NCT07598370Status: NOT_YET_RECRUITING → RECRUITING

Frequently asked questions about LY3439539

What is LY3439539 used for?

LY3439539 is an investigational small molecule being studied for the treatment of Alzheimer's Disease. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities. The drug is being evaluated in a clinical trial involving participants with Alzheimer's Disease.

Who makes LY3439539?

LY3439539 is being developed by Eli Lilly and Company, a pharmaceutical company traded on the New York Stock Exchange under the ticker symbol LLY. The company is conducting a Phase 1 clinical trial to evaluate the safety and tolerability of LY3439539 in participants with Alzheimer's Disease.

What phase is LY3439539 in?

LY3439539 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA or any other regulatory agency. The ongoing Phase 1 trial is currently recruiting participants with Alzheimer's Disease to assess the drug's safety and other characteristics.

What clinical trials is LY3439539 in?

LY3439539 is being studied in one clinical trial with the identifier NCT07598370, titled "A Study of LY3439539 in Participants With Alzheimer's Disease." This Phase 1 trial is currently recruiting and aims to enroll 30 participants aged 50 years and older in the United States, Australia, New Zealand, and Singapore.

Is LY3439539 FDA approved?

LY3439539 is not FDA approved. It is an investigational drug currently in Phase 1 clinical trials for Alzheimer's Disease. The drug is being studied to evaluate its safety and tolerability, and it has not yet completed the clinical development process required for regulatory approval.