Information about the drug that will be tested in the study
The drug will be administered via an intravenous infusion (an injection into the vein).
Is the drug already on the market for another medical condition?
Will all participants receive the same drug?
Participants will be selected at random to either receive one of the following options:
- An intravenous injection of Lecanemab, 5mg/kg every two weeks through 8 weeks, then 10 mg/kg every two weeks through 96 weeks and 10 mg/kg every four weeks through 216 weeks
- An intravenous injection of placebo every two weeks through 96 weeks then every four weeks through 216 weeks (also called a dummy treatment which is an inactive substance identical in appearance to the drug being tested with no active therapeutic effect)
- An intravenous injection of Lecanemab, 5mg/kg every four weeks through 8 weeks, then 10 mg/kg every four weeks through 216 weeks
- An intravenous injection of placebo every four weeks through 96 weeks.
Neither the participant nor his/her doctor will know if the person is receiving the investigational drug or the placebo.
Information about participating in the trial
What are the researchers trying to find out?
The purpose of the study is to evaluate the safety and efficacy of Lecanemab in people with preclinical Alzheimer's disease and elevated amyloid (A45 Trial) and in people with early preclinical Alzheimer's disease and intermediate amyloid (A3 Trial)
How long will the treatment last?
Around 4 years
What your involvement will entail?
- During the study, participants will be asked to complete some questionnaires to evaluate their cognition, behaviour, function and activities of daily living (e.g. PACC5, CFI, MMSE)
- Complete a test that will assess memory, orientation, judgment and problem solving, personal care and community affairs (this is a test called CDR-SB)
- All participants will be asked to undertake brain scans (PET) and those that opt in will have lumbar punctures (CSF) to see changes in biomarkers in the brain
Further information on the procedures, tests and number of visits can be obtained from the study team.
Who can participate in this study?
Who can participate in the study?
To take part in the study, participants must:
- Be between 55 and 80 years old
- Participants who have between 55 and 64 years old must have one of the following risk factors: - First degree relative (a parent, brother or sister) diagnosed with dementia onset before 75 years old - Known to possess at least 1 apolipoprotein E4 variant (APOE4) allele, or - Known to have elevated brain amyloid according to previous PET or cerebrospinal fluid (CSF) tests
- Have a score of 0 in the Clinical Dementia Rating-Global Score (CDR) and a score above 17 in the MMSE test (a test about your memory). This would suggest that the person has no impairment in its memory
- Have a score above 6 in the WMS-R LM II test (a logic memory subtest) to measure the verbal episodic memory
- Have evidence of abnormal accumulation of amyloid in their brain (PET scan)
- Have a study partner who has a sufficient contact with the participant and is willing to participate in study procedures throughout the study duration.
Who cannot participate in the study?
People cannot take part in the study if they have or have experienced:
- A pregnancy or lactation for female participants
- History of a stroke,transient ischemic attack or seizures
- A disease or conditions that may interfere with the safety, tolerability and/or study assessments, or put the participant at special risk (e.g. psychiatric symptoms, auto-immune disease, inflammatory neurological disorders)
- Contraindication to PET brain scans
- Known to be HIV positive
- Drug or alcohol abuse or dependence
- Participation in other clinical studies involving active immunization, unless it can be confirmed that the participant only received placebo.
The above list is not exhaustive. It includes the most common conditions and diseases that might exclude people from the study.
Information for your doctor
Study contact information
Link to full text
The information contained in this document is based on information available on public registries (e.g. clinicaltrials.gov website) on August 2023.
This document has been reviewed by the pharmaceutical company running this trial.
This document has been reviewed by a member of the European Working Group of People with Dementia.