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LX1001

Phase 1

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

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment25
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05400330Long-Term Follow-up of Gene Therapy for APOE4 Homozygote Alzheimer's DiseasePHASE1 ACTIVE NOT_RECRUITING 10May 8, 2023Nov 1, 2028Jul 1, 20252 United States
NCT03634007Gene Therapy for APOE4 Homozygote of Alzheimer's DiseasePHASE1 COMPLETED 15Nov 6, 2019Nov 7, 2024Oct 20, 20254 United States
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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 — 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