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NCT06911944PHASE4NOT_YET_RECRUITING

Amyloid Lowering for Alzheimer's in Down's With Donanemab Investigation

A Randomized, Double-Blind, Placebo-Controlled, Phase 4 Dose-Escalation Study Evaluating the Safety, Tolerability, and Efficacy of Donanemab in Adults With Down Syndrome

Sponsor: Michael Rafii, MD, PhD + National Institute on Aging (NIA), Eli Lilly and Company

No open prediction endpoints

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Key Facts

Study type
INTERVENTIONAL
Conditions
Down Syndrome (DS), Down Syndrome (Trisomy 21), Alzheimer Disease, Amyloid Beta Protein
Interventions
Donanemab, Placebo
Enrollment
60 participants
Primary completion
Dec 2028
Study completion
Dec 2028
First posted
Apr 2025
Last updated
May 2026

Primary Endpoints (CT.gov)

Change from baseline on brain amyloid levels

Time frame: 12 months

Secondary Endpoints

Change from baseline to 12 months in the Modified Cued Recall Test (mCRT)

Change from baseline in whole brain volume

Change from baseline in brain hippocampal volume

Eligibility Criteria

Inclusion Criteria: 1. Documentation of the participant's informed consent to study procedures 2. Ages 35-50 years (inclusive). 3. Plasma Phosphorylated tau (pTau) 217 levels at screening consistent with amyloid PET eligibility. 4. Diagnosis of Down syndrome (including trisomy 21, mosaic trisomy 21, Robertsonian translocation trisomy 21, or partial trisomy 21) as confirmed by medical record review or Karyotype genetic testing. 5. Intelligence quotient (IQ) equal to or greater than 40 based on Kaufman Brief Intelligence Test, Second Edition. 6. Participants must be in good general health as evidenced by medical history with no diagnosis of dementia. 7. Elevated brain amyloid (\>18 centiloids) at screening. 8. Stable dose of permitted medications as described protocol for 4 weeks prior to screening. 9. In the opinion of the site PI, has a study partner able and willing to provide accurate information (including clinical symptoms and medical history) about the participant and participate

Read full criteria on CT.gov →

✦ Analyst Commentary

Expert commentary on why this trial matters and what to watch for.

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Source

Open on ClinicalTrials.gov