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Showing 1–24 of 155 matching trials from the live ClinicalTrials.gov search.
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Completed Phase 3 Interventional

Efficacy and Safety Study of STX209 (Arbaclofen) for the Treatment of Social Withdrawal in Children With Fragile X Syndrome

NCT01325220
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
arbaclofen, Placebo
Drug
Lead sponsor
Seaside Therapeutics, Inc.
Industry
Eligibility
5 Years to 11 Years
Enrollment
172 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2011
U.S. locations
28
States / cities
Phoenix, Arizona • Long Beach, California • Sacramento, California + 24 more
Source: ClinicalTrials.gov public record
Updated Jul 30, 2013 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Phase 2 Interventional

Hormone Replacement Therapy to Treat Turner Syndrome

NCT00013546
View directory record Official record
Conditions
Osteoporosis, Turner's Syndrome
Interventions
TMTDS
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
Female only
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2002
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 17, 2026, 6:25 PM EDT
Suspended Phase 2 Interventional

A Study to Assess the Tolerability of a Single Dose of STX107 in Adults With Fragile X Syndrome

NCT01325740
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
STX107
Drug
Lead sponsor
Seaside Therapeutics, Inc.
Industry
Eligibility
18 Years to 50 Years · Male only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
5
States / cities
Los Angeles, California • Sacramento, California • Aurora, Colorado + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 19, 2012 · Synced Sep 17, 2026, 6:25 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Development of Non-invasive Prenatal Screening Test for Microdeletions Based on Fetal DNA Isolated From Maternal Blood

NCT01852708
View directory record Official record
Conditions
Trisomy 21, Trisomy 18, Trisomy 13, Sex Chromosome Abnormalities, Microdeletion Syndromes
Interventions
Not listed
Lead sponsor
Natera, Inc.
Industry
Eligibility
18 Years and older
Enrollment
1,059 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2020
U.S. locations
7
States / cities
San Carlos, California • San Gabriel, California • Washington D.C., District of Columbia + 4 more
Source: ClinicalTrials.gov public record
Updated Dec 29, 2020 · Synced Sep 17, 2026, 6:25 PM EDT
Withdrawn No phase listed Observational

A Non-Interventional Pilot Study to Explore the Role of Gut Flora in Autism

NCT04100863
View directory record Official record
Conditions
Autism, Autism Spectrum Disorder, Autistic Disorder, Autism, Akinetic, Autism; Atypical, Autism; Psychopathy, Autism Fragile Syndrome X, Autism With High Cognitive Abilities, Autism-Related Speech Delay, Autism, Susceptibility to, 6, Autism Spectrum Disorder High-Functioning, Autistic Thinking, Autism, Susceptibility to, X-Linked 6, Autistic Behavior
Interventions
No Intervention
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
6 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2030
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Jun 4, 2025 · Synced Sep 17, 2026, 6:25 PM EDT
Completed No phase listed Observational

Comparison of Aneuploidy Risk Evaluations

NCT01663350
View directory record Official record
Conditions
Pregnancy, Down Syndrome, Edwards Syndrome, Patau Syndrome, Turners Syndrome
Interventions
Not listed
Lead sponsor
Verinata Health, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
3,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2012
U.S. locations
26
States / cities
San Diego, California • Atlanta, Georgia • Chicago, Illinois + 22 more
Source: ClinicalTrials.gov public record
Updated Jul 15, 2013 · Synced Sep 17, 2026, 6:25 PM EDT
Withdrawn No phase listed Observational

Adaptive Behavior Assessment of Men With 49, XXXXY, Klinefelter Syndrome

NCT00347464
View directory record Official record
Conditions
Klinefelter Syndrome
Interventions
Not listed
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
2 Years to 21 Years · Male only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 2, 2015 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Estrogen Dosing in Turner Syndrome: Pharmacology and Metabolism

NCT00837616
View directory record Official record
Conditions
Turner Syndrome, Hypogonadism, Premature Ovarian Failure
Interventions
17 B estradiol orally, 17 B estradiol
Drug
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
13 Years to 20 Years · Female only
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
2
States / cities
Jacksonville, Florida • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 15, 2023 · Synced Sep 17, 2026, 6:25 PM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

A Study of RM-718 in Healthy Subjects and Patients With MC4R Pathway Impairment

NCT06239116
View directory record Official record
Conditions
Hypothalamic Obesity, Prader-Willi Syndrome, PWS
Interventions
Part A: RM-718 or placebo (matched to specific RM-718 dose cohort), Part B: RM-718 or placebo (matched to specific RM-718 dose cohort), Part C: RM-718, Part D: RM-718
Drug
Lead sponsor
Rhythm Pharmaceuticals, Inc.
Industry
Eligibility
12 Years to 65 Years
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
7
States / cities
Birmingham, Alabama • Chicago, Illinois • Boston, Massachusetts + 3 more
Source: ClinicalTrials.gov public record
Updated Dec 21, 2025 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Single-Dose Study in Normal Volunteers to Assess the Safety, Tolerability and Pharmacokinetics of STX107

NCT00965432
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
STX107
Drug
Lead sponsor
Seaside Therapeutics, Inc.
Industry
Eligibility
18 Years to 50 Years · Male only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 7, 2010 · Synced Sep 17, 2026, 6:25 PM EDT
Not yet recruiting Phase 2 Interventional

Inhibition of Aggressive Behavior in Participants With Fragile X Syndrome

NCT07328529
View directory record Official record
Conditions
Aggressive Behavior in Fragile X Syndome
Interventions
SRX246, Placebo
Drug
Lead sponsor
Azevan Pharmaceuticals
Industry
Eligibility
18 Years to 45 Years · Male only
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
3
States / cities
Sacramento, California • Chicago, Illinois • Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 8, 2026 · Synced Sep 17, 2026, 6:25 PM EDT
Completed No phase listed Observational

Health, Fitness, and Quality of Life in Adolescent Girls With Turner Syndrome

NCT03181230
View directory record Official record
Conditions
Turner Syndrome, Turner Syndrome Mosaicism, 45, X/46, XX or XY, Turner Syndrome Mosaicism 46,X,I(X)(Q10)/45,X, Turner Syndrome Karyotype 46,X With Abnormal Sex Chromosome , Except I(Xq)
Interventions
No intervention
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
12 Years to 21 Years · Female only
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated May 2, 2021 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Phase 2 Interventional

Placebo-Controlled, Single-Dose Challenge Study of Gaboxadol in Adult Males With Fragile X Syndrome (FXS)

NCT06334419
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
Gaboxadol, Placebo
Drug
Lead sponsor
Craig Erickson
Other
Eligibility
18 Years to 40 Years · Male only
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 22, 2025 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Not applicable Interventional Results available

Trial of Minocycline to Treat Children With Fragile X Syndrome

NCT01053156
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
minocycline hydrochloride, Placebo
Drug
Lead sponsor
University of California, Davis
Other
Eligibility
42 Months to 16 Years
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated May 29, 2017 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Phase 2 Interventional

A Study of RO4917523 in Pediatric Patients With Fragile X Syndrome

NCT01750957
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
Placebo, RO4917523
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
5 Years to 13 Years
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
20
States / cities
Long Beach, California • Sacramento, California • San Diego, California + 17 more
Source: ClinicalTrials.gov public record
Updated Aug 10, 2016 · Synced Sep 17, 2026, 6:25 PM EDT
Terminated Phase 1 Interventional

Neuroimaging GABA Physiology in Fragile X Syndrome

NCT04308954
View directory record Official record
Conditions
Fragile X Syndrome (FXS), Idiopathic Intellectual Developmental Disorder (IDD)
Interventions
[18F]flumazenil
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 30 Years · Male only
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jan 27, 2021 · Synced Sep 17, 2026, 6:25 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

High Risk Multiple Gestation Study

NCT02278874
View directory record Official record
Conditions
Trisomy 13, Trisomy 18, Trisomy 21, Sex Chromosome Abnormalities
Interventions
Not listed
Lead sponsor
Natera, Inc.
Industry
Eligibility
18 Years and older
Enrollment
99 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
4
States / cities
Boston, Massachusetts • Glen Cove, New York • New York, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 12, 2019 · Synced Sep 17, 2026, 6:25 PM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Parent and Infant Inter(X)Action Intervention (PIXI)

NCT03836300
View directory record Official record
Conditions
Fragile X Syndrome, Angelman Syndrome, Prader-Willi Syndrome, Dup15Q Syndrome, Duchenne Muscular Dystrophy, Phelan-McDermid Syndrome, Rett Syndrome, Smith Magenis Syndrome, Williams Syndrome, Turner Syndrome, Klinefelter Syndrome, Chromosome 22q11.2 Deletion Syndrome, Tuberous Sclerosis, Down Syndrome
Interventions
Parent-Infant Inter(X)action Intervention (PIXI)
Behavioral
Lead sponsor
RTI International
Other
Eligibility
Up to 99 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2026
U.S. locations
1
States / cities
Research Triangle Park, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Not applicable Interventional

Teaching Math Skills to Individuals With Fragile X Syndrome

NCT01204151
View directory record Official record
Conditions
Developmental Disabilities, Fragile X Syndrome
Interventions
discrete-trial training
Behavioral
Lead sponsor
Stanford University
Other
Eligibility
10 Years to 23 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated May 8, 2019 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Phase 3 Interventional

A Study of BPN14770 in Male Adults (Aged 18 to 45) With Fragile X Syndrome

NCT05358886
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
BPN14770/ zatolmilast, Placebo
Drug
Lead sponsor
Tetra Discovery Partners
Industry
Eligibility
18 Years to 45 Years · Male only
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
17
States / cities
Irvine, California • Orange, California • Sacramento, California + 14 more
Source: ClinicalTrials.gov public record
Updated Jul 9, 2026 · Synced Sep 17, 2026, 6:25 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Examining Social, Emotional, and Cognitive Functioning in People With Fragile X and Down Syndromes

NCT00879515
View directory record Official record
Conditions
Anxiety Disorders, Child Developmental Disorders, Pervasive
Interventions
Not listed
Lead sponsor
University of California, Davis
Other
Eligibility
5 Years to 25 Years
Enrollment
511 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2010
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated May 29, 2017 · Synced Sep 17, 2026, 6:25 PM EDT
Not yet recruiting Phase 2 Interventional

Pre-pubertal Low Dose Transdermal Estradiol in Turner Syndrome

NCT07784582
View directory record Official record
Conditions
Turner Syndrome, Primary Ovarian Insufficiency
Interventions
Estradiol transdermal patch 0.025mg/24 hours- 1/8th fractionated patch
Drug
Lead sponsor
Children's National Research Institute
Other
Eligibility
8 Years to 12 Years · Female only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Aug 24, 2026 · Synced Sep 17, 2026, 6:25 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Tracking Early Emergence of Sound Perception Impairments in FXS With Multimodal fNIRS/EEG- Infant

NCT06560242
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
Speech discrimination
Other
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
6 Months to 26 Months
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 9, 2026 · Synced Sep 17, 2026, 6:25 PM EDT
Completed Phase 4 Interventional Results available

Long-Term Growth and Skeletal Effects of Early Growth Hormone Treatment in Turner Syndrome

NCT00266656
View directory record Official record
Conditions
Turner Syndrome
Interventions
Humatrope
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
4 Years to 20 Years · Female only
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2015
U.S. locations
9
States / cities
Los Angeles, California • Aurora, Colorado • Hartford, Connecticut + 6 more
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Sep 17, 2026, 6:25 PM EDT