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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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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 in patients who are APOE4 homozygotes. It is currently in Phase 1 clinical development and has not been approved by the FDA.

What does LX1001 target?

LX1001 targets the APOE4 gene, which is a genetic risk factor for Alzheimer Disease. The therapy is designed to address the underlying genetic cause in APOE4 homozygotes.

Who makes LX1001?

LX1001 is being developed by Lexeo Therapeutics, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol LXEO.

What phase is LX1001 in?

LX1001 is in Phase 1 clinical development. It is an investigational drug and has not yet been approved by the FDA for any use.

What clinical trials is LX1001 in?

LX1001 has been studied in two Phase 1 trials. NCT03634007, a completed trial with 15 participants, and NCT05400330, an active long-term follow-up trial with 10 participants, both conducted in the United States.

Is LX1001 the same as gene therapy for APOE4 homozygote Alzheimer's Disease?

Yes, LX1001 is the gene therapy being evaluated in trials for APOE4 homozygote Alzheimer's Disease. The trials are titled 'Gene Therapy for APOE4 Homozygote of Alzheimer's Disease' and its long-term follow-up.