Down Syndrome (Trisomy 21) Clinical Trials

7 recruitingLast updated: June 18, 2026

There are 7 actively recruiting down syndrome (trisomy 21) clinical trials across 4 countries. Studies span Not Applicable, Phase 2, Phase 3. Top locations include Madrid, Spain, Barcelona, Spain, Baton Rouge, Louisiana, United States. Updated daily from ClinicalTrials.gov.


Down Syndrome (Trisomy 21) Trials at a Glance

7 actively recruiting trials for down syndrome (trisomy 21) are listed on ClinicalTrialsFinder across 6 cities in 4 countries. The largest study group is Not Applicable with 1 trial, with the heaviest enrollment activity in Madrid, Barcelona, and Baton Rouge. Lead sponsors running down syndrome (trisomy 21) studies include BillionToOne Inc., Fundació Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau, and Aelis Farma.

Browse down syndrome (trisomy 21) trials by phase

Treatments under study

About Down Syndrome (Trisomy 21) Clinical Trials

Looking for clinical trials for Down Syndrome (Trisomy 21)? There are currently 7 studies actively recruiting participants. Clinical trials offer access to new treatments before they are widely available, and every approved therapy in use today was first tested through a clinical trial.

Below you can browse trials, sign up for alerts when new Down Syndrome (Trisomy 21) trials open, and view eligibility criteria for each study. Each listing includes the study phase, locations, and enrollment details.

Frequently Asked Questions

Common questions about Down Syndrome (Trisomy 21) clinical trials

A clinical trial is a carefully designed research study that tests new medical treatments, drugs, devices, or approaches in human volunteers. Every approved medication and treatment available today was proven safe and effective through clinical trials.

All clinical trials are reviewed and approved by Institutional Review Boards (IRBs) — independent committees that evaluate patient safety. Trials follow strict protocols, and your health is monitored closely throughout. You can withdraw at any time.

Not necessarily. Many trials compare the new treatment against the current standard of care, meaning all participants receive active treatment. When placebos are used, they are typically combined with standard treatment, not given alone. The trial description will always specify the design.

Under the Affordable Care Act, most private insurers are required to cover routine patient care costs during a clinical trial. The sponsor typically covers the investigational treatment itself. Medicare also covers routine costs for qualifying trials.

Yes. Participation is completely voluntary. You can withdraw at any time, for any reason, without it affecting your access to standard medical care.

Each trial has specific eligibility criteria — including age, diagnosis, disease stage, prior treatments, and general health. Browse the trials listed above and check their eligibility sections. You can also contact the trial site directly to discuss your situation.

Showing 17 of 7 trials

Recruiting

The ADVANCE (Assay Development and Validation for Pre-Natal and Obstetric Conditions) Study is the Largest U.S.-Based Prospective Study Demonstrating a Circulating Fetal Cell (CFC) Based Approach to Non-invasive Fetal Risk Assessment

AneuploidyDown Syndrome (Trisomy 21)22q11.2 Deletion Syndrome+4 more
BillionToOne Inc.1,000 enrolled6 locationsNCT07643896
Recruiting

Vascular Function in Adults With Down Syndrome

Down Syndrome (Trisomy 21)
University of Nevada, Las Vegas24 enrolled1 locationNCT07630207
Recruiting
Phase 2

AEF0217 in Participants With Down Syndrome

Down Syndrome (Trisomy 21)
Aelis Farma188 enrolled10 locationsNCT07334912
Recruiting

Oro-myofunctional Characteristics and Obstructive Sleep Apnea in Infants With Down Syndrome

Obstructive Sleep ApneaDown Syndrome (Trisomy 21)
Hospices Civils de Lyon30 enrolled1 locationNCT07195253
Recruiting

Intensive Multimodal Neurorehabilitation Targeting Neuroplasticity in Pediatric Neurodevelopmental and Chromosomal Disorders

Traumatic Brain Injury (TBI)Hypoxic-ischemic encephalopathy (HIE)Williams Syndrome+20 more
Healing Hope International100 enrolled1 locationNCT07493096
Recruiting
Not Applicable

Sleep Intervention and Quality of Life in Down Syndrome

Down SyndromeDown Syndrome (Trisomy 21)
University of Alabama at Birmingham20 enrolled1 locationNCT06783725
Recruiting
Phase 3

LEvetiracetam to Prevent Seizures in Symptomatic Alzheimer's Disease in Adults With Down Syndrome

EpilepsyAlzheimer DiseaseSeizures+7 more
Fundació Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau120 enrolled5 locationsNCT07234695