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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Mental Retardation, X Linked Clear all
Not listed Phase 3 Interventional

Independent Studies of Dextromethorphan and of Donepezil Hydrochloride for Rett Syndrome

NCT00069550
View directory record Official record
Conditions
Rett Syndrome
Interventions
dextromethorphan, donepezil hydrochloride
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
1 Year to 15 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2008
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Jul 23, 2026, 10:58 AM EDT
Completed No phase listed Observational

Predictors of Caregiver Adaptation to Pervasive Developmental Disorders

NCT00496210
View directory record Official record
Conditions
Autism, Asperger's Syndrome, Rett's Disorder
Interventions
Not listed
Lead sponsor
National Human Genome Research Institute (NHGRI)
NIH
Eligibility
18 Years and older
Enrollment
324 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 14, 2019 · Synced Jul 23, 2026, 10:58 AM EDT
Not listed Phase 1Phase 2 Interventional

Metformin in Patients With Fragile X

NCT04141163
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
Metformin, Placebo oral tablet
Drug
Lead sponsor
Rowan University
Other
Eligibility
18 Years to 50 Years · Male only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Stratford, New Jersey
Source: ClinicalTrials.gov public record
Updated Oct 30, 2019 · Synced Jul 23, 2026, 10:58 AM EDT
Recruiting No phase listed Observational

Registry of Patients Diagnosed With Lysosomal Storage Diseases

NCT05619900
View directory record Official record
Conditions
Mucopolysaccharidosis I, Mucopolysaccharidosis II, Mucopolysaccharidosis IV A, Mucopolysaccharidosis VI, Mucopolysaccharidosis VII, Pompe Disease Infantile-Onset, Neuronopathic Gaucher Disease, Wolman Disease
Interventions
There is no intervention
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
Up to 64 Years
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2050
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 7, 2026 · Synced Jul 23, 2026, 10:58 AM EDT
Terminated Phase 1Phase 2 Interventional

A Study to Evaluate Administration of SBT101 Gene Therapy in Adult Patients With Adrenomyeloneuropathy (AMN)

NCT05394064
View directory record Official record
Conditions
AMN, AMN Gene Mutation, X-ALD
Interventions
SBT101, Imitation Procedure
Genetic · Procedure
Lead sponsor
SwanBio Therapeutics, Inc.
Industry
Eligibility
18 Years to 65 Years · Male only
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 30, 2025 · Synced Jul 23, 2026, 10:58 AM EDT
Completed Phase 2 Interventional Results available

Placebo Controlled Trial of Dextromethorphan in Rett Syndrome

NCT01520363
View directory record Official record
Conditions
Rett Syndrome
Interventions
dextromethorphan, placebo
Drug
Lead sponsor
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
Other
Eligibility
1 Year to 10 Years
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 3, 2018 · Synced Jul 23, 2026, 10:58 AM EDT
Completed Phase 2 Interventional Results available

AFQ056 for Language Learning in Children With FXS

NCT02920892
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
AFQ056, Placebo, Language Intervention
Drug · Other
Lead sponsor
Elizabeth Berry-Kravis
Other
Eligibility
32 Months to 6 Years
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
14
States / cities
Davis, California • Denver, Colorado • New Haven, Connecticut + 11 more
Source: ClinicalTrials.gov public record
Updated Oct 9, 2023 · Synced Jul 23, 2026, 10:58 AM EDT
Active, not recruiting Phase 2Phase 3 Interventional

CAMPSIITE™ RGX-121 Gene Therapy in Subjects With MPS II (Hunter Syndrome)

NCT03566043
View directory record Official record
Conditions
Mucopolysaccharidosis Type II (MPS II)
Interventions
RGX-121
Genetic
Lead sponsor
REGENXBIO Inc.
Industry
Eligibility
4 Months to 5 Years · Male only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2025
U.S. locations
4
States / cities
Oakland, California • New Brunswick, New Jersey • Philadelphia, Pennsylvania + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 27, 2025 · Synced Jul 23, 2026, 10:58 AM EDT
Completed Not applicable Interventional Results available

Reduced-Intensity Hematopoietic Stem Cell Transplant for High Risk Lysosomal and Peroxisomal Disorders

NCT01626092
View directory record Official record
Conditions
Lysosomal Storage Disease, Peroxisomal Disorder
Interventions
Campath-1H, Clofarabine, Melphalan, Total Body Irradiation with Marrow Boosting, Hematopoietic stem cell transplantation, Cyclosporine A, Mycophenolate mofetil
Drug · Radiation · Biological
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
Up to 55 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 4, 2017 · Synced Jul 23, 2026, 10:58 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

At-Home Research Study for Patients With Autoimmune, Inflammatory, Genetic, Hematological, Infectious, Neurological, CNS, Oncological, Respiratory, Metabolic Conditions

NCT01931644
View directory record Official record
Conditions
All Diagnosed Health Conditions, ADD/ADHD, Alopecia Areata, Ankylosing Spondylitis, Asthma, Atopic Dermatitis Eczema, Beta Thalassemia, Bipolar Disorder, Breast Cancer, Celiac Disease, Cervical Cancer, Chronic Inflammatory Demyelinating Polyneuropathy, Chronic Kidney Diseases, Chronic Obstructive Pulmonary Disease, Colon Cancer, Colorectal Cancer, Crohn's Disease, Cystic Fibrosis, Depression, Diabetes Mellitus, Duchenne Muscular Dystrophy, Endometriosis, Epilepsy, Facioscapulohumeral Muscular Dystrophy, G6PD Deficiency, General Anxiety Disorder, Hepatitis B, Hereditary Hemorrhagic Telangiectasia, HIV/AIDS, Human Papilloma Virus, Huntington's Disease, Idiopathic Thrombocytopenic Purpura, Insomnia, Kidney Cancer, Leukemia, Lung Cancer, Lupus Nephritis, Lymphoma, Melanoma, Multiple Myeloma, Multiple Sclerosis, Myositis, Myotonic Dystrophy, Ovarian Cancer, Pancreatic Cancer, Parkinson's Disease, Polycystic Kidney Diseases, Prostate Cancer, Psoriasis, Psoriatic Arthritis, Rosacea, Scleroderma, Sickle Cell Anemia, Sickle Cell Trait, Sjogren's Syndrome, Skin Cancer, Spinal Muscular Atrophy, Systemic Lupus Erythematosus, Thrombotic Thrombocytopenic Purpura, Trisomy 21, Ulcerative Colitis
Interventions
Not listed
Lead sponsor
Sanguine Biosciences
Industry
Eligibility
18 Years to 100 Years
Enrollment
17,667 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 17, 2024 · Synced Jul 23, 2026, 10:58 AM EDT
Completed No phase listed Observational

Biobanking of Rett Syndrome and Related Disorders

NCT02705677
View directory record Official record
Conditions
Rett Syndrome, MECP2 Duplication, CDKL5, FOXG1 Disorders
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
Not listed
Enrollment
752 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
12
States / cities
Birmingham, Alabama • Oakland, California • San Diego, California + 9 more
Source: ClinicalTrials.gov public record
Updated Aug 4, 2021 · Synced Jul 23, 2026, 10:58 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Aromatase Activity and Ovarian Growth Factors in African-American Versus Caucasian Women

NCT00334971
View directory record Official record
Conditions
Healthy, Fragile X Syndrome
Interventions
Follicle Aspiration
Procedure
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
116 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 5, 2013 · Synced Jul 23, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Exercise Study of Function and Pathology for Women With X-linked Adrenoleukodystrophy

NCT01594853
View directory record Official record
Conditions
X-linked Adrenoleukodystrophy
Interventions
exercise training
Behavioral
Lead sponsor
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
Other
Eligibility
21 Years to 70 Years · Female only
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 28, 2018 · Synced Jul 23, 2026, 10:58 AM EDT
Available No phase listed Expanded access

Post-trial Access Program of Idursulfase-IT Along With Elaprase in Children With Hunter Syndrome

NCT05795361
View directory record Official record
Conditions
Hunter Syndrome
Interventions
Idursulfase-IT
Drug
Lead sponsor
Takeda
Industry
Eligibility
Male only
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
17
States / cities
Phoenix, Arizona • Oakland, California • Wilmington, Delaware + 14 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2026 · Synced Jul 23, 2026, 10:58 AM EDT
Active, not recruiting Not applicable Interventional

Web Intervention for Parents of Youth With Genetic Syndromes (WINGS)

NCT06139172
View directory record Official record
Conditions
Telomeric 22Q13 Monosomy Syndrome, Tuberous Sclerosis, Hamartoma Syndrome, Multiple, Fragile X Syndrome, Angelman Syndrome, Rett Syndrome, Chromosome 15Q, Partial Deletion, Creatine Deficiency, X-linked
Interventions
Functional Behavioral Training (FBT), Positive Parenting Strategies-Treatment as Usual
Behavioral · Other
Lead sponsor
Rush University Medical Center
Other
Eligibility
2 Years to 12 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Jul 23, 2026, 10:58 AM EDT
Withdrawn No phase listed Observational

Mucopolysaccharidosis Type II Observational

NCT04591834
View directory record Official record
Conditions
Mucopolysaccharidosis II
Interventions
Observational
Other
Lead sponsor
REGENXBIO Inc.
Industry
Eligibility
1 Month to 8 Years · Male only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
2
States / cities
Oakland, California • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 9, 2022 · Synced Jul 23, 2026, 10:58 AM EDT
Active, not recruiting Phase 3 Interventional

A Phase 1/2/3 Study of TSHA-102 Gene Therapy in Females With Rett Syndrome (REVEAL Pivotal Study)

NCT05606614
View directory record Official record
Conditions
Rett Syndrome
Interventions
TSHA-102
Genetic
Lead sponsor
Taysha Gene Therapies, Inc.
Industry
Eligibility
6 Years to 21 Years · Female only
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2031
U.S. locations
8
States / cities
Duarte, California • La Jolla, California • Oakland, California + 5 more
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Jul 23, 2026, 10:58 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Neurophysiologic Biomarkers in Rett Syndrome

NCT05932589
View directory record Official record
Conditions
Rett Syndrome, RTT, Rett Syndrome, Atypical
Interventions
EEG and Auditory and Visual Evoked Potentials (AEP and VEP), Clinical assessment
Other
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
1 Year to 18 Years · Female only
Enrollment
202 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2029
U.S. locations
6
States / cities
Los Angeles, California • Aurora, Colorado • Brookline, Massachusetts + 3 more
Source: ClinicalTrials.gov public record
Updated Oct 19, 2025 · Synced Jul 23, 2026, 10:58 AM EDT
Completed Phase 1 Interventional

A Pilot Study of Vitamin D in Boys With X-linked Adrenoleukodystrophy

NCT02595489
View directory record Official record
Conditions
X-linked Adrenoleukodystrophy
Interventions
vitamin D3
Dietary Supplement
Lead sponsor
Stanford University
Other
Eligibility
18 Months to 25 Years · Male only
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Jun 8, 2022 · Synced Jul 23, 2026, 10:58 AM EDT
Recruiting No phase listed Observational

Congenital Muscle Disease Study of Patient and Family Reported Medical Information

NCT01403402
View directory record Official record
Conditions
Congenital Muscular Dystrophy With ITGA7 (Integrin Alpha-7) Deficiency, Alpha-Dystroglycanopathy (Congenital Muscular Dystrophy and Abnormal Glycosylation of Dystroglycan With Severe Epilepsy), Alpha-Dystroglycanopathy (Congenital Muscular Dystrophy With Fatty Liver and Infantile-onset Cataract Caused by TRAPPC11 Mutations), Alpha-Dystroglycanopathy (Congenital Muscular Dystrophy With Hypoglycosylation of Dystroglycan), Alpha-Dystroglycanopathy (Congenital Muscular Dystrophy With Hypoglycosylation of Dystroglycan and Epilepsy), Alpha-Dystroglycanopathy (Dystroglycanopathy, Congenital With or Without Mental Retardation (Formerly MDC1C)), Alpha-Dystroglycanopathy (Fukuyama CMD), Alpha-Dystroglycanopathy (LGMDR09 FKRP Related (Formerly LGMD2I)), Alpha-Dystroglycanopathy (LGMDR11 POMT1 Related (Formerly LGMD2K)), Alpha-Dystroglycanopathy (LGMDR13 FKTN Related (Formerly LGMD2M)), Alpha-Dystroglycanopathy (LGMDR14 POMT2 Related (Formerly LGMD2N)), Alpha-Dystroglycanopathy (LGMDR15 POMGnT1 Related (Formerly LGMD2O)), Alpha-Dystroglycanopathy (LGMDR19 GMPPB Related (Formerly LGMD2T)), Alpha-Dystroglycanopathy (LGMDR20 ISPD Related (Formerly LGMD2U)), Alpha-Dystroglycanopathy (LGMDR24 POMGnT2 Related), Alpha-Dystroglycanopathy (Muscle Eye Brain Disease (MEB)), Alpha-Dystroglycanopathy (Walker Warburg Syndrome (WWS)), Choline Kinase B Receptor - CHKB, Collagen VI Related Disorders, Collagen XII Related Disorders, Congenital Muscular Dystrophy Not Otherwise Specified (Including Merosin Positive), Congenital Muscular Dystrophy With Cataracts and Intellectual Disability (MDCCAID), Congenital Muscular Dystrophy With Joint Hyperlaxity, Congenital Muscular Dystrophy With Rigid Spine Related to ACTA1, Emery-Dreifuss Muscular Dystrophy, GOLGA2-related Congenital Muscle Dystrophy With Brain Involvement, LMNA Related Disorders, Merosin Deficient CMD (Full or Partial), Nesprin Related MD (SYNE1), SELENON Related Disorders (Previously Known as SEPN1), SELENON Related Myopathy (Aka SEPN1), Telethonin CMD, Congenital Myasthenic Syndrome, Limb-Girdle Muscular Dystrophy, LGMDD01 - DNAJB6 (Formerly LGMD1D), LGMDD05 - Collagen VI Related Bethlem Myopathy (Dominant), LGMDR07 - Telethonin (TCAP) Related (Formerly LGMD2G), LGMDR08 - TRIM Related (Formerly LGMD2H), LGMDR09 - FKRP Related (Formerly LGMD2I), LGMDR10 - Titin (TTN) Related (Formerly LGMD2J), LGMDR11 - POMT1 Related (Formerly LGMD2K), LGMDR13 - Fukutin (FKTN) Related (Formerly LGMD2M), LGMDR14 - POMT2 Related (Formerly LGMD2N), LGMDR15 - POMGnT1 Related (Formerly LGMD2O), LGMDR16 - DAG1 Related Dystroglycanopathy (Formerly LGMD2P), LGMDR17 - Plectin (PLEC) Related (Formerly LGMD2Q), LGMDR18 - TRAPPC11 Related (Formerly LGMD2S), LGMDR19 - GMPPB Related (Formerly LGMD2T), LGMDR20 - ISPD Related (Formerly LGMD2U), LGMDR22 - Collagen VI Related Bethlem Myopathy (Recessive), LGMDR23 - LAMA2 Related, LGMDR24 - POMGnT2 Related
Interventions
Not listed
Lead sponsor
Cure CMD
Other
Eligibility
Not listed
Enrollment
4,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2029
U.S. locations
1
States / cities
Lakewood, California
Source: ClinicalTrials.gov public record
Updated Aug 8, 2021 · Synced Jul 23, 2026, 10:58 AM EDT
Completed Phase 4 Interventional Results available

Combining Lovastatin and a Parent-Implemented Language Intervention for Fragile X Syndrome

NCT02642653
View directory record Official record
Conditions
Fragile X Syndrome, Genetic Diseases
Interventions
Lovastatin, Placebo
Drug · Other
Lead sponsor
University of California, Davis
Other
Eligibility
10 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Sep 10, 2019 · Synced Jul 23, 2026, 10:58 AM EDT
Recruiting Not applicable Interventional

Measuring Impact of Computer Gaming on Arm Use in Rett Syndrome

NCT05012475
View directory record Official record
Conditions
Rett Syndrome
Interventions
Modified Virtual Reality Gaming
Behavioral
Lead sponsor
Georgetown University
Other
Eligibility
4 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2025
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Oct 2, 2024 · Synced Jul 23, 2026, 10:58 AM EDT
Terminated Phase 2 Interventional

An Open Label Extension Study of STX209 in Subjects With Fragile X Syndrome

NCT01013480
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
Arbaclofen
Drug
Lead sponsor
Seaside Therapeutics, Inc.
Industry
Eligibility
6 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
9
States / cities
Los Angeles, California • Sacramento, California • Chicago, Illinois + 6 more
Source: ClinicalTrials.gov public record
Updated Dec 19, 2012 · Synced Jul 23, 2026, 10:58 AM EDT
Terminated No phase listed Observational

MPS II Immunophenotyping

NCT04976231
View directory record Official record
Conditions
MPS II, Mucopolysaccharidosis II, Hunter Syndrome
Interventions
Not listed
Lead sponsor
Duke University
Other
Eligibility
Not listed
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Jul 23, 2026, 10:58 AM EDT