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LX1001

Phase 1

Alzheimer Disease | Monoclonal antibody | Neurology |Lexeo Therapeutics, Inc.|Last Updated: Oct 20, 2025

Target and mechanism

Molecular targetAPOE4
Target classGene
ModalityMonoclonal antibody

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials2
Total Enrollment25

FDA Designations

No designations recorded

Clinical trial landscape

LX1001 · 2 trials · 2 indications

Phase 1 2
NCT05400330Long-Term Follow-up of Gene Therapy for APOE4 Homozygote Alzheimer's DiseaseAlzheimer Disease
ACTIVE NOT_RECRUITING10 Analytics
NCT03634007Gene Therapy for APOE4 Homozygote of Alzheimer's DiseaseAlzheimer Disease
COMPLETED15 Analytics
PHASE1ACTIVE NOT_RECRUITING
Long-Term Follow-up of Gene Therapy for APOE4 Homozygote Alzheimer's Disease
Alzheimer DiseaseUnlock trial analytics
PHASE1COMPLETED
Gene Therapy for APOE4 Homozygote of Alzheimer's Disease
Alzheimer DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of treatment emergent adverse events
260 weeks

All emergent adverse events will be collected

Incidence of serious adverse events
260 weeks

All incidents of serious adverse events will be collected

Proportion of participants with treatment-emergent adverse events and serious adverse events
1 year

Adverse events categorized and graded

The proportion of participants with treatment-emergent adverse events and serious adverse events at each dosage
1 year

Adverse events categorized and graded per study drug dose

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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Previously administered LX1001EXPERIMENTALThis is a long-term follow-up study to evaluate the safety following LX1001, a gene therapy, for participants who are APOE4 homozygotes with clinical diagnoses varying from MCI or dementia due to AD who have previously received LX1001. Study LX1001-01 was designed to assess the safety of LX1001 at 4 ascending doses (1.4 × 1010, 4.4 × 1010, 1.4 × 1011 gene copy \[gc\]/mL CSF and 1.4 x 1014 \[fixed dose\]) as per droplet digital polymerase chain reaction methodology, with each group consisting of approximately n=3-5 individuals for a total of approximately 15 participants for the entire study. In this study, participants who have received LX1001 in the parent protocol (LX1001-01) will be followed for up to 260 weeks post gene therapy administration
Cohort 1: 1.4 x 10^10 gc/mL CSFEXPERIMENTALParticipants will receive 1.4 x 10\^10 gc/mL CSF of LX1001.
Cohort 2: 4.4 x 10^10 gc/mL CSFEXPERIMENTALParticipants will receive 4.4 x 10\^10 gc/mL CSF of LX1001.
Cohort 3: 1.4 x 10^11 gc/mL CSFEXPERIMENTALParticipants will receive 1.4 x 10\^11 gc/mL CSF of LX1001.
Cohort 4: 1.4 x 10^14 gc (fixed dose)EXPERIMENTALParticipants will receive 1.4 x 10\^14 gc (fixed dose; approximately 3.4 × 10\^11 gc/mL CSF based on an average CSF volume of 409 mL) of LX1001.

Interventions

NameTypeDescription
LX1001BIOLOGICALGene therapy
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Eligibility Criteria

Age Range50 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites2

Inclusion Criteria: * Participants who received LX1001 in study LX1001-01 Exclusion Criteria: * Participants with any clinically significant medical condition that, in the opinion of the investigator, would pose a risk to participant safety * Participants who agree not to post their personal medi...

Countries:United States
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Recent Changes (Last 90 Days)

LOWMay 26, 2026NCT05400330primaryCompletionDate: changed
LOWMay 24, 2026NCT05400330studyFirstPostDate: changed

Frequently asked questions about LX1001

What is LX1001 used for in Alzheimer Disease?

LX1001 is an investigational gene therapy being developed for Alzheimer Disease, specifically for patients who are APOE4 homozygotes. It is currently in Phase 1 clinical development and has not been approved by the FDA. The therapy is designed to address the genetic risk associated with the APOE4 variant in this patient population.

What does LX1001 target?

LX1001 targets the APOE4 gene, which is a genetic risk factor for Alzheimer Disease. As a gene therapy, it aims to modify or compensate for the effects of the APOE4 variant. The drug is being studied in patients who carry two copies of the APOE4 gene, known as homozygotes.

Who makes LX1001?

LX1001 is being developed by Lexeo Therapeutics, Inc., a biopharmaceutical company. The company is conducting clinical trials to evaluate the safety and efficacy of this gene therapy for Alzheimer Disease in patients with the APOE4 genotype.

What phase is LX1001 in?

LX1001 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The Phase 1 trials are designed to assess safety, tolerability, and preliminary efficacy in patients with Alzheimer Disease who are APOE4 homozygotes.

What clinical trials is LX1001 in?

LX1001 has been studied in two clinical trials. The first, NCT03634007, was a completed Phase 1 study in patients with Alzheimer Disease and early onset Alzheimer Disease. The second, NCT05400330, is an active long-term follow-up study in Alzheimer Disease patients. Both trials are based in the United States.

Is LX1001 the same as a gene therapy for APOE4?

LX1001 is a gene therapy specifically designed for patients with Alzheimer Disease who are APOE4 homozygotes. It targets the APOE4 gene, which is a known genetic risk factor for the disease. The therapy is being investigated to potentially address this genetic cause in the affected population.