A Study to Evaluate AB-1001 Striatal Administration in Adults With Early Manifest Huntington's Disease

Phase 1

Active, not recruiting

• Conditions: Huntington Disease
• Interventions: Genetic: AB-1001 Gene Therapy

• Registration Number: NCT05541627
• Lead Sponsor: Brainvectis, a subsidiary of Asklepios BioPharmaceutical, Inc. (AskBio)

Brief Summary

A Phase I/II Dose-Finding Study to Evaluate Striatal Administration of AB-1001 (previously BV-101) in Adults with Early Manifest Huntington's Disease

Detailed Description

This is a Phase I/II, first-in-human, open-label study to evaluate the safety, tolerability, and preliminary efficacy signals in subjects with early manifest HD following treatment with one-time intracerebral bilateral injections of AB-1001 within the striatum (caudate and putamen).

This study consists of 2 parts: Dose-Finding Part and Expansion Part; each part consists of 3 phases: Screening Phase (8 weeks, with extension to 12 weeks to accommodate scheduling if needed), Treatment and Initial Follow-Up Phase (52 weeks) and Long-Term Follow-Up Phase (4 years). In the Dose-Finding Part, 2 dose titers will be tested in 3-6 subjects in each cohort. Once a dose is selected based on Dose-Limiting Toxicities, an additional 6 subjects will be enrolled into the Dose Expansion Part.

Study Timeline

• Study First Submitted: 2022-09-13
• Study First Submitted QC: 2022-09-13
• Study First Posted: 2022-09-15
• Study Start: 2022-10-12
• Status Verified: 2024-08
• Last Update Submitted: 2024-08-05
• Last Update Posted: 2024-08-06
• Primary Completion: 2025-12-31
• Study Completion: 2029-12-31

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 5

Inclusion Criteria

• Male or Female subjects between ages 18 and 65 years (both inclusive) at time of consenting, able to provide Informed Consent and able to understand and comply with all study procedures.
• Documented genetic confirmation of pathological CAG expansion in the huntingtin gene ≥40.
• Early manifest HD as defined by a UHDRS total functional capacity (TFC) score of 9 to 13 and a diagnostic classification level (DCL) of 4, or a DCL of 3 if present with cognitive impairment and clear evidence of disease progression.
• Striatal MRI volumes per hemisphere: Putamen ≥ 2.3 cm3 (per side); Caudate ≥ 1.7 cm3 (per side) on Screening MRI.
• All HD concomitant medications stable for at least 30 days prior to screening at the investigator's discretion.

Key

Exclusion Criteria

• Prior or ongoing medical condition, physical findings, ECG findings, or laboratory abnormality that, in the investigator's opinion, would impact subject's safety and compliance with the study procedures.
• Metastatic neoplasms within the five years prior to screening.
• Presence of clinically relevant immunologic, hematologic, hepatic, cardiac, or renal disease at the time of screening as per investigator's clinical judgment.
• Current untreated and unstable depressive disorder or a serious mood disorder requiring hospitalization.
• History of prior suicide attempt or imminent risk of self-harm based on investigator's judgment or with a "yes" answer on item 4 or 5 on the Columbia Suicide Severity Rating Scale (C-SSRS).
• Patients with history of confirmed stroke, known intracranial neoplasms, vascular malformations, or intracranial hemorrhage.
• Subjects not deemed suitable for the surgical procedure as per the Neurosurgeon's judgment.
• Any history of gene therapy, cell transplantation or any other experimental brain surgery.
• Any RNA or DNA targeted HD specific investigational agents such as antisense oligonucleotides within 6 months prior to screening.
• Subjects unable to tolerate or unwilling to undergo multiple lumbar punctures.
• Participation in any clinical trial of an approved or non-approved investigational drug or intervention within 12 weeks or 5 half-lives whichever is longer prior to treatment.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Cohort 1	AB-1001 Gene Therapy	Low-dose of AB-1001
Cohort 2	AB-1001 Gene Therapy	High-dose of AB-1001

Primary Outcome Measures

Name	Time	Method
Incidence of Dose-Limiting Toxicities (DLTs), Treatment-Emergent Adverse Events (TEAEs), and Serious Adverse Events (SAEs)	Through Week 52	The incidence of DLTs, TEAEs, and SAEs will be measured according to protocol specifications.

Secondary Outcome Measures

Name	Time	Method
Mutant Huntingtin protein (mHTT)	At Week 52	The change from baseline in mHTT in blood and cerebrospinal fluid (CSF) will be measured
Neurofilament light chain (NfL)	At Week 52	The change from baseline in blood and CSF NfL will be measured
24OH cholesterol	At Week 52	The change from baseline in blood and CSF 24OH cholesterol will be measured
Positron emission tomography (PET) fluoro-deoxyglucose (FDG) striatal profile	At Week 52	Change from baseline in PET FDG striatal profile
Composite Unified Huntington Disease Rating Scale (cUHDRS)	At Week 52	The change from baseline in the cUHDRS will be measured (a higher score indicates better functioning)
Magnetic resonance spectroscopy (MRS) metabolic profile	At Week 52	Change from baseline in MRS metabolic profile
Anatomical and volumetric measures of brain regions impacted by HD as assessed by MRI	At Week 52	The magnitude and variability of change from baseline in anatomical and volumetric measures of brain regions impacted by HD as assessed by MRI will be measured

Trial Locations

Locations (1)

Institut du Cerveau (ICM), Hôpital La Pitié Salpêtrière APHP; 🇫🇷 Paris, Ile-de-France, France