First in Human Study for Safety and Tolerability of AL003.

A Phase I Study Evaluating the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of Single and Multiple Doses of AL003 in Healthy Participants and in Participants With Mild to Moderate Alzheimer's Disease.

This is a multi-center, randomized, double-blind, placebo-controlled, dose escalation first in human (FIH) study in healthy adults and in patients with mild to moderate Alzheimer's disease. The study is designed to systematically assess the safety (including immunogenicity) and tolerability, pharmacokinetics (PK) and pharmacodynamics (PD) of AL003.

Study Overview

• Status: Completed
• Conditions: Healthy; Alzheimer Disease
• Intervention / Treatment: Biological: AL003; Other: Saline Solution

Detailed Description

The study will be conducted in 2 phases:

In the single ascending dose (SAD) phase, up to approximately 42 healthy adult participants will be sequentially enrolled into up to approximately 7 cohorts. In the multiple-dose (MD) phase, approximately 12 patients with mild to moderate Alzheimer's disease will be enrolled in one cohort.

• Study Type: Interventional
• Enrollment (Actual): 54
• Phase: Phase 1

Contacts and Locations

Study Locations

• Australia
  • Melbourne, Australia
    • Nucleus Network
• United States
  • Florida
    • Delray Beach, Florida, United States, 33445
      • Brain Matters Research
    • Lady Lake, Florida, United States, 32159
      • Charter Research
    • Orlando, Florida, United States, 32806
      • PPD Clinical Research Unit
    • The Villages, Florida, United States, 32162
      • Synexus AES
  • New York
    • New York, New York, United States, 10032
      • Columbia University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 85 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

1. Total body weight between 50 and 120 kg, inclusive
2. Clinical laboratory evaluations (including chemistry panel fasted [at least 8 hours], complete blood count (CBC), and urine analysis) within the reference range for the test laboratory, unless deemed not clinically significant by the Investigator. A count of the segmented neutrophils and bands should be performed when results from the white blood cells (WBCs) are not within the reference range.
3. Negative test for selected drugs of abuse at screening (dose not include alcohol) and at admission (does include alcohol breath test). A positive result may be verified by re-testing (up to one false positive result permitted) and may be followed up at the discretion of the Investigator.
4. Females must be non-pregnant and non-lactating, and either surgically sterile, using double barrier method or abstinence.
5. In good health, determined by no clinically significant findings from medical history, physical examination, 12-lead electrocardiogram (ECG), laboratory tests, and vital signs.

For MD cohort

1. Ages 50-85 years, inclusive.
2. The participant should be capable of completing assessments alone, per local guidelines.
3. Availability of a person ("study partner") who, in the Investigator's judgment, has frequent and sufficient contact with the participant and is able to provide accurate information regarding the participant's cognitive and functional abilities, agrees to provide information at clinic visits, which require partner input for scale completion, and signs the necessary consent form, per local guidelines.
4. Clinical diagnosis of probable Alzheimer's disease dementia based on National Institute on Aging Alzheimer's Association criteria.

Exclusion Criteria:

1. Pregnant or lactating, or intending to become pregnant within 16 weeks after last dose of study drug.
2. Participation in a clinical trial within 30 days before randomization; use of any experimental oral therapy within 30 days or 5 half-lives prior to Day 1, whichever is greater; or use of any biologic therapy within 12 weeks or 5 half-lives prior to Day 1, whichever is greater. Participants who have received an experimental therapy that has no half-life, like a vaccine, should have completed that therapy at least 12 weeks prior to Day 1. Participants who have received an experimental vaccine against a central nervous system (CNS) target, such as beta-amyloid or tau, are not eligible for this study.
3. Any non-experimental vaccine within 2 weeks of randomization, until 2 weeks after the last dose. It is advised that prospective participants receive their annual influenza vaccine as early as possible in advance of the flu season, and then wait 2 weeks prior to randomization. It is permitted to receive the annual influenza vaccine during the screening period.
4. Surgery or hospitalization during the 4 weeks prior to screening.
5. Planned procedure or surgery during the study.
6. Systemically, clinically significantly immunocompromised patients, owing to continuing effects of immune suppressing medication.
7. Known history of severe allergic, anaphylactic, or other hypersensitivity reactions to chimeric, human, or humanized antibodies or fusion proteins.
8. Past history of seizures, with the exception of childhood febrile seizures.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: AL003 by intravenous (IV) infusion; Single-doses of AL003 in dose-escalating cohorts Multiple doses of AL003 in single cohort	Biological: AL003; Single-doses of AL003 in dose-escalating cohorts Multiple doses of AL003 in a single cohort
Placebo Comparator: Placebo by intravenous (IV) infusion; Matching saline solution will be administered for placebo subjects	Other: Saline Solution; Saline Solution will be administered as a single infusion for each dose escalation cohort in a ratio of 6 active and 2 placebo and as multiple infusions in the single cohort in a ratio of 10 active and 2 placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Evaluation of safety and tolerability of AL003 measured by number of subjects with adverse events and dose limiting adverse events (DLAE)	Incidence of adverse events during the treatment and follow up periods through out the study.	141 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Pharmacokinetics (PK) of AL003	Serum and CSF concentration of AL003 at specific time points	85 days
Maximum concentration (Cmax) for AL003	Evaluate Cmax for serum and CSF concentration of AL003 at specified time points	85 days
Area under the curve concentration (AUC) for AL003	Evaluate AUC for serum and CSF concentration of AL003 at specified time points	85 days

Collaborators and Investigators

• Sponsor: Alector Inc.
• Investigators: Study Director: Robert Paul, MD, Alector Inc.

Study record dates

Study Major Dates

• Study Start (Actual): March 29, 2019
• Primary Completion (Actual): May 6, 2021
• Study Completion (Actual): May 6, 2021

Study Registration Dates

• First Submitted: January 28, 2019
• First Submitted That Met QC Criteria: January 28, 2019
• First Posted (Actual): January 30, 2019

Study Record Updates

• Last Update Posted (Actual): September 17, 2021
• Last Update Submitted That Met QC Criteria: September 15, 2021
• Last Verified: September 1, 2021

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Mental Disorders; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Neurocognitive Disorders; Neurodegenerative Diseases; Dementia; Tauopathies; Alzheimer Disease
• Other Study ID Numbers: AL003-1

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: Yes

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No