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A Study to Learn About the Safety of BIIB080 Injections and Whether They Can Improve Symptoms of Participants With Mild Cognitive Impairment Due to Alzheimer's Disease (AD) or Mild AD Dementia Between 50 to 80 Years of Age

NCT05399888 · Status: ACTIVE_NOT_RECRUITING · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 416

Last updated 2025-05-18

No results posted yet for this study

Summary

In this study, researchers will learn more about a study drug called BIIB080. The study will focus on participants with mild cognitive impairment or mild dementia due to AD.

The main question researchers are trying to answer is if BIIB080 can slow the worsening of AD more than placebo. It will focus on what dose of BIIB080 slows worsening of AD the most.

To help answer this question, researchers will use the Clinical Dementia Rating-Sum of Boxes, also known as the CDR-SB.

* Clinicians use the CDR-SB to measure several categories of dementia symptoms.
* The results for each category are added together for a total score. Lower scores are better.

Researchers will also learn more about the safety of BIIB080.

The study will be split into 2 parts. The 1st part is the Placebo-Controlled Period. The 2nd part is the Long-Term Extension (LTE) Period. The 2nd part of the study will help researchers learn about the long-term safety of BIIB080, and how it affects the participant's daily life, thinking, and memory abilities in the longer term.

A description of how the study will be done is given below.

* After screening, participants will first receive either a low dose or high dose of BIIB080, or a placebo, as an injection into the fluid around the spinal cord (cerebrospinal fluid). A placebo looks like the study drug but contains no real medicine.
* Participants will receive BIIB080 or placebo once every 12 weeks or 24 weeks.
* After 76 weeks of treatment in the Placebo-Controlled Period, eligible participants will move onto the Extension Treatment period, which will last 96 weeks.
* In the extension period, participants who received placebo will be switched to high dose BIIB080 every 12 or 24 weeks.
* Participants may be in the study for up to 201 weeks, or about 4 years. This includes the screening and follow-up periods.
* Participants can continue to take certain medications for AD. Participants must be on the same dose of medication for at least 8 weeks before the screening period.
* After the screening period, most participants will visit the clinic every 6 weeks.

Conditions

  • Mild Cognitive Impairment Due to Alzheimer's Disease
  • Alzheimer's Disease Dementia

Interventions

DRUG

BIIB080

Administered as specified in the treatment arm.

DRUG

BIIB080-matching placebo

Administered as specified in the treatment arm.

Sponsors & Collaborators

Principal Investigators

  • Medical Director · Biogen

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Min Age
50 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2022-08-24
Primary Completion
2026-05-14
Completion
2029-01-08
FDA Drug
Yes

Countries

  • United States
  • Australia
  • Belgium
  • Canada
  • Czechia
  • Denmark
  • Finland
  • France
  • Germany
  • Italy
  • Japan
  • Netherlands
  • Poland
  • Spain
  • Sweden
  • Switzerland
  • United Kingdom

Study Locations

More Related Trials

Entities

Companies

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05399888 on ClinicalTrials.gov