ABATE Study: ACI-24.060 for Alzheimer's and Down Syndrome

This study, called ABATE, is testing a treatment called ACI-24.060 for people with early Alzheimer's disease and adults with Down syndrome who do not have dementia. The main goals are to see how safe ACI-24.060 is, how well people tolerate it, and how the body reacts to it. Some participants will receive ACI-24.060 at different doses, while others will receive a placebo (an inactive substance). To join, you must be between 35 and 85 years old. For the Alzheimer's part, you need to have early signs of Alzheimer's and a PET scan showing amyloid plaques (protein clumps in the brain). The study plans to enroll 304 participants.

Study design
This is an interventional study with 304 planned participants. It is divided into two main parts, one for Alzheimer's disease and one for Down syndrome.
What's involved
Participants will receive either ACI-24.060 or a placebo. Safety will be checked through adverse events and MRI scans, with measurements taken up to 100 weeks.
Compensation
Not stated in the trial record.
Follow-up
Participants in Study Part 1a will be followed for up to 74 weeks, and those in Study Part 1b and Part 2 will be followed for up to 100 weeks.

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NCT05462106

A Study to Assess the Effects of ACI-24.060 in Alzheimer's Disease and in Down Syndrome (ABATE Study)

Recruiting
PHASE1Ages 35–85InterventionalTreatment
AC Immune SA
~304 participants
Updated 2026-07-10 on ClinicalTrials.gov
What's tested:Placebo (Study Part 1a)ACI-24.060 at Dose A in Study Part 1aACI-24.060 at Dose B in Study Part 1aACI-24.060 at Dose C in Study Part 1aACI-24.060 with an additional adjuvant at Dose D in Study Part 1bPlacebo (Study Part 2)

At a glance

Recruiting sites
12 of 26 listed sites are recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Number of participants with Adverse Events (AEs) assessed by intensity (mild, moderate or severe) and causal relationship (unrelated, unlikely, possibly or probably related)
Measured over From Screening to Week 74 (Study Part 1a) and from Screening to Week 100 (Study Part 1b)
+8 more outcomes measured
Amyloid Plaque
Beta-Amyloid
DSAD
Prodromal Alzheimer's Disease
Alzheimer's Disease
26 sites across 11 states
Spain7
United Kingdom6
Florida4
Tennessee2
Arizona1
Indiana1
Kansas1
Massachusetts1
  • Michael Rafii, MD · PRINCIPAL_INVESTIGATOR · University of Southern California, Alzheimer's Therapeutic Research Institute, 9860 Mesa Rim Rd, San Diego, CA 92121, USA

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  • Number of participants with Adverse Events (AEs) assessed by intensity (mild, moderate or severe) and causal relationship (unrelated, unlikely, possibly or probably related)From Screening to Week 74 (Study Part 1a) and from Screening to Week 100 (Study Part 1b)
  • Number of participants with Adverse Events (AEs) assessed by intensity (mild, moderate or severe) and causal relationship (unrelated, unlikely, possibly or probably related)From Screening to Week 100 (Study Part 2)
  • Number of participants with abnormal MRI resultsFrom Baseline to Week 74 (Study Part 1a) and from Baseline to Week 100 (Study Part 1b)
  • Number of participants with abnormal MRI resultsFrom Baseline to Week 100 (Study Part 2)
  • Number of participants with abnormal physical and neurological examination resultsFrom Baseline to Week 74 (Study Part 1a) and from Baseline to Week 100 (Study Part 1b)
  • Number of participants with abnormal physical and neurological examination resultsFrom Baseline to Week 100 (Study Part 2)
  • Number of participants reporting suicidal ideation or behavior using Columbia-Suicide Severity Rating Scale (C-SSRS)From Baseline to Week 74 (Study Part 1a) and from Baseline to Week 100 (Study Part 1b)
  • Number of participants reporting suicidal ideation or behavior using Columbia-Suicide Severity Rating Scale (C-SSRS)From Baseline to Week 100 (Study Part 2)
  • Change from baseline in Anti-Abeta antibody titers in bloodFrom Baseline to Week 100 (Study Part 2)