The APEX study is a multicenter, observational study designed to capture longitudinal follow-up of plasma biomarkers and cognitive and functional assessments on individuals who screen failed in the AHEAD study over approximately 4 years.
Approximately 1000 participants will be enrolled across three groups:
* Group A: Approximately 500 participants who are discordant on screening (plasma positive / Positron Emission Tomography (PET) negative),
* Group B: Approximately 250 participants who are concordant on screening (plasma negative / PET negative), and
* Group C: Approximately 250 participants selected from the individuals who previously screen failed prior to PET for the AHEAD study with oversampling of racial and ethnic populations underrepresented in Alzheimer's disease (AD) clinical trials.
Primary Objectives:
* Collect longitudinal cognitive and functional assessments and blood-based biomarker data
* Evaluate, characterize, and compare the longitudinal cognitive and functional data between the three groups of participants
* Compare longitudinal change across race and ethnicity, sex, and Apolipoprotein E (ApoE) status
Exploratory Objectives:
• Collect baseline amyloid PET on participants without prior amyloid PET data (Group C)
Who can participate
Age range
55 Years – 80 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion criteria
. Documentation of the participant's informed consent to study procedures and for the use of protected health information (HIPAA Authorization, if applicable). Informed consent processes and documentation must adhere to state laws/local requirements, including consent provided by the participant's legally authorized representative (LAR), responsible next of kin, surrogate consent with assent, etc.
. Previously consented to participate in A3-45 screening.
. Has A3-45 screening plasma biomarker results required for determining eligibility to participate in the A3-45 trial.
. If an amyloid PET scan was conducted in A3-45, the scan was determined to be below the 20 centiloid cutpoint required for eligibility into the treatment arms of the A3 or A45 trial.
. As assessed by the site PI, participant is likely to be able to comply with the protocol, including completion of all required procedures for the duration of the study, and has adequate vision, hearing (hearing aid permitted), and literacy in English or Spanish sufficient for compliance with required testing procedures.
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Rate of change from Baseline to Month 48 on plasma beta-amyloid (Aβ) 40 or 42 ratio
. Current treatment with an FDA approved medication for Alzheimer's disease, including prior or current treatment with a prohibited medication.
. Enrollment in another investigational study, or intake of investigational drug, within 30 days prior to screening, or five half-lives of the investigational drug, whichever is longer, unless it can be documented that the participant was in the placebo treatment arm.
. Screen failed from A3-45 due to not meeting basic inclusion criterion (i.e., age requirement; current diagnosis of AD dementia).