Long-Term Follow-up of Gene Therapy for APOE4 Homozygote Alzheimer's Disease (LEADLTFU)

Lexeo Therapeutics

Status and phase: Enrolling; Phase 1

Conditions: Alzheimer Disease

Treatments: Biological: LX1001

Study type: Interventional

Funder types: Industry

Identifiers

NCT05400330

LX1001-02

Details and patient eligibility

About

The primary purpose of this long-term follow-up study is to assess the long-term safety profile of APOE4 homozygote participants who were administered gene therapy (LX1001) for the treatment of Alzheimer's disease in Study LX100101. A secondary objective is to assess the biomarker as shown by the conversion of CSF APOE isoforms from APOE4 to APOE2-APOE4. Additional secondary outcomes include amyloid PET scan, CSF markers (including Aβ42, Aβ42/Aβ40 ratio T--tau, and P-tau), and quantitative MRI (and other biomarkers that may be informative for this therapeutic approach). Other secondary objectives include instruments to assess cognitive and clinical AD and to evaluate if treatment with AAVrh.10hAPOE2 improves brain tau pathology with tau PET scan (LX1001-01 Cohort 3 only).

Full description

This 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 3 ascending doses (1.4 × 1010, 4.4 × 1010, 1.4 × 1011gene copy [gc]/mL CSF) as per droplet digital polymerase chain reaction methodology, with each group consisting of approximately n=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 to assess the safety and efficacy parameters (~208 weeks within this study)

Enrollment: 15 estimated patients

Sex: All

Ages: 50+ years old

Volunteers: No Healthy Volunteers

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 medical data in relation to this study or any study information online, including social media sites, until all participants have completed all LX1001 clinical studies, including long-term follow-up.

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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15 participants in 1 patient group

Previously administered LX1001

Experimental group

Description:

This 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 3 ascending doses (1.4 × 1010, 4.4 × 1010, 1.4 × 1011 gene copy \[gc\]/mL CSF) as per droplet digital polymerase chain reaction methodology, with each group consisting of approximately n=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

Treatment:

Biological: LX1001