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ClinicalTrials.gov public records Last synced Sep 5, 2026, 10:38 AM EDT

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Showing 1–24 of 82 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Tysabri Clear all
Completed No phase listed Observational

Pregnancy Exposure Registry for Tysabri®

NCT00472992
View directory record Official record
Conditions
Crohn's Disease, Prenatal Exposure, Multiple Sclerosis, Pregnancy
Interventions
Not listed
Lead sponsor
Biogen
Industry
Eligibility
Female only
Enrollment
376 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
Morgantown, West Virginia
Source: ClinicalTrials.gov public record
Updated Aug 10, 2014 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational

Longitudinal Analysis And Sample Collection To Evaluate PML Risk Host Markers for PML Risk Host Markers for PML Risk

NCT02440126
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Not listed
Lead sponsor
Rocky Mountain MS Research Group, LLC
Other
Eligibility
18 Years and older
Enrollment
196 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Feb 20, 2021 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 2 Interventional Results available

Treatment Interruption of Natalizumab

NCT01071083
View directory record Official record
Conditions
Relapsing Remitting Multiple Sclerosis
Interventions
natalizumab, interferon beta 1-a, methylprednisolone, IV placebo, glatiramer acetate
Drug · Other
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 60 Years
Enrollment
175 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
20
States / cities
Cullman, Alabama • San Francisco, California • Fort Collins, Colorado + 15 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2013 · Synced Sep 5, 2026, 10:38 AM EDT
Active, not recruiting No phase listed Observational

A Study to Learn More About The Safety of Diroximel Fumarate (VUMERITY®) in Participants Who Took it During Pregnancy And About the Health of Their Babies

NCT05688436
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Diroximel Fumarate, Alemtuzumab, Fingolimod, Glatiramer acetate, Interferon beta, Natalizumab, Ocrelizumab, Ofatumumab, Ozanimod, Peginterferon beta-1a, Ponesimod, Siponimod
Drug · Biological
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 49 Years · Female only
Enrollment
1,178 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2031
U.S. locations
1
States / cities
Eden Prairie, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 4 Interventional Results available

Sequential Natalizumab - Alemtuzumab Therapy in Patients With Relapsing Forms of Multiple Sclerosis

NCT03135249
View directory record Official record
Conditions
Multiple Sclerosis (MS)
Interventions
Alemtuzumab
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
2
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Feb 14, 2022 · Synced Sep 5, 2026, 10:38 AM EDT
Terminated Phase 4 Interventional Results available

Corticosteroids for Immune Reconstitution Inflammatory Syndrome (IRIS)

NCT01211665
View directory record Official record
Conditions
Immune Reconstitution Inflammatory Syndrome, Leukoencephalopathy, Progressive Multifocal
Interventions
Methylprednisolone, Prednisolone
Drug
Lead sponsor
Biogen
Industry
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Hastings, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 4, 2014 · Synced Sep 5, 2026, 10:38 AM EDT
Terminated Phase 2 Interventional Results available

Natalizumab in the Treatment of Rheumatoid Arthritis in Subjects Receiving Methotrexate

NCT00083759
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
natalizumab, placebo
Drug
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 75 Years
Enrollment
299 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2004
U.S. locations
10
States / cities
Birmingham, Alabama • Tucson, Arizona • Escondido, California + 7 more
Source: ClinicalTrials.gov public record
Updated Jul 17, 2016 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational

A Study of MSDx Complex 1 as a Marker for Therapy Response in Multiple Sclerosis

NCT01541618
View directory record Official record
Conditions
Relapsing Remitting Multiple Sclerosis
Interventions
MSDX Complex-1 Biomarker test
Other
Lead sponsor
MSDx, Inc.
Industry
Eligibility
45 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 1, 2020 · Synced Sep 5, 2026, 10:38 AM EDT
Terminated No phase listed Observational

Genetic Evaluation of Natalizumab-Treated Patients With Progressive Multifocal Leukoencephalopathy

NCT01211639
View directory record Official record
Conditions
Progressive Multifocal Leukoencephalopathy
Interventions
Not listed
Lead sponsor
Biogen
Industry
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
10
States / cities
Cullman, Alabama • Aurora, Colorado • Chicago, Illinois + 7 more
Source: ClinicalTrials.gov public record
Updated Jan 18, 2015 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 2 Interventional

Safety, Tolerability and Effectiveness of Natalizumab in Adolescents With Active Crohn's Disease

NCT00055367
View directory record Official record
Conditions
Crohn's Disease
Interventions
natalizumab
Drug
Lead sponsor
Biogen
Industry
Eligibility
12 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2004
U.S. locations
11
States / cities
Los Angeles, California • Hartford, Connecticut • Miami, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Jun 15, 2016 · Synced Sep 5, 2026, 10:38 AM EDT
Terminated Phase 3 Interventional Results available

A Clinical Study of the Efficacy of Natalizumab on Reducing Disability Progression in Participants With Secondary Progressive Multiple Sclerosis

NCT01416181
View directory record Official record
Conditions
Secondary Progressive Multiple Sclerosis
Interventions
natalizumab, Placebo
Drug
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 58 Years
Enrollment
889 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
35
States / cities
Phoenix, Arizona • Tucson, Arizona • Fullerton, California + 29 more
Source: ClinicalTrials.gov public record
Updated Sep 10, 2017 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Examining Effects of Tysabri on Cognitive Fatigue Using fMRI

NCT04565431
View directory record Official record
Conditions
Multiple Sclerosis, Relapsing-Remitting
Interventions
Tysabri
Drug
Lead sponsor
Kessler Foundation
Other
Eligibility
18 Years to 64 Years
Enrollment
7 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
West Orange, New Jersey
Source: ClinicalTrials.gov public record
Updated Aug 10, 2026 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 4 Interventional

A Pharmacokinetic (PK) Study of Natalizumab (Tysabri) at Steady State

NCT00744679
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Natalizumab
Drug
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
1
States / cities
Latham, New York
Source: ClinicalTrials.gov public record
Updated Feb 9, 2015 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Not applicable Interventional Results available

The Effect of Natalizumab (Tysabri) on Sexual Dysfunction in Multiple Sclerosis

NCT01455220
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Tysabri ® (Natalizumab)
Drug
Lead sponsor
University of South Florida
Other
Eligibility
18 Years to 60 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 3 Interventional Results available

Natalizumab Re-Initiation of Dosing

NCT00306592
View directory record Official record
Conditions
Multiple Sclerosis, Relapsing-Remitting
Interventions
BG00002 (natalizumab)
Biological
Lead sponsor
Biogen
Industry
Eligibility
18 Years and older
Enrollment
404 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
53
States / cities
Birmingham, Alabama • Phoenix, Arizona • Scottsdale, Arizona + 46 more
Source: ClinicalTrials.gov public record
Updated Mar 20, 2017 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational Results available

Evaluating the Efficacy and Safety of Transitioning Patients From Natalizumab to Ocrelizumab

NCT03157830
View directory record Official record
Conditions
Relapsing Remitting Multiple Sclerosis
Interventions
Not listed
Lead sponsor
Providence Health & Services
Other
Eligibility
18 Years to 65 Years
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
5
States / cities
Livingston, New Jersey • Portland, Oregon • Richland, Washington + 2 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 5, 2026, 10:38 AM EDT
Withdrawn Phase 2 Interventional

Alternative Treatment Paradigm for Natalizumab Trial

NCT01710228
View directory record Official record
Conditions
Multiple Sclerosis (MS)
Interventions
methylprednisolone
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 60 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 28, 2016 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 1 Interventional

Motixafortide and Natalizumab to Mobilize CD34+ Hematopoietic Stem Cells for Gene Therapies in Sickle Cell Disease (SCD)

NCT05618301
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Motixafortide, Natalizumab, Leukapheresis
Drug · Procedure
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 10, 2025 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 1 Interventional

Safety Study of Natalizumab to Treat Multiple Sclerosis (MS)

NCT00559702
View directory record Official record
Conditions
Relapsing-Remitting Multiple Sclerosis, Secondary Progressive Multiple Sclerosis
Interventions
natalizumab, standard of care
Drug · Other
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 65 Years
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
12
States / cities
Phoenix, Arizona • Scottsdale, Arizona • Berkeley, California + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 8, 2014 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational

Pilot Study to Assess Disease Stability in a Natalizumab to Dimethyl Fumarate Crossover Design

NCT01945359
View directory record Official record
Conditions
Relapsing Remitting Multiple Sclerosis
Interventions
Not listed
Lead sponsor
Rocky Mountain MS Research Group, LLC
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Oct 15, 2015 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational

TYSABRI Global Observational Program in Safety

NCT00477113
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Not listed
Lead sponsor
Biogen
Industry
Eligibility
Not listed
Enrollment
2,207 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 21, 2015 · Synced Sep 5, 2026, 10:38 AM EDT
Completed Phase 3 Interventional

Safety and Efficacy of Natalizumab in Combination With Avonex in the Treatment of Multiple Sclerosis

NCT00030966
View directory record Official record
Conditions
Multiple Sclerosis, Relapsing-Remitting
Interventions
Natalizumab, Placebo
Drug
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 55 Years
Enrollment
1,200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2005
U.S. locations
72
States / cities
Birmingham, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 59 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2009 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Humoral and T-Cell Responses to COVID-19 Vaccination in Multiple Sclerosis Patients Treated With Ocrelizumab Treated With Ocrelizumab or Natalizumab

NCT04837651
View directory record Official record
Conditions
Multiple Sclerosis, Demyelinating Autoimmune Diseases, CNS, Autoimmune Diseases of the Nervous System, Nervous System Diseases, Demyelinating Diseases, Autoimmune Diseases, Immune System Diseases, Pathologic Processes
Interventions
Elecsys semi-quantitative Anti-SARS-CoV-2 antibody test, T-Detect COVID T-cell blood test
Device
Lead sponsor
Dragonfly Research, LLC
Other
Eligibility
18 Years to 55 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Wellesley, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 1, 2021 · Synced Sep 5, 2026, 10:38 AM EDT
Completed No phase listed Observational

JC Virus Antibody Study of Participants With Relapsing Forms of MS Receiving Treatment With Natalizumab

NCT01070836
View directory record Official record
Conditions
Relapsing Multiple Sclerosis
Interventions
natalizumab
Drug
Lead sponsor
Biogen
Industry
Eligibility
Not listed
Enrollment
35,895 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
473
States / cities
Birmingham, Alabama • Cullman, Alabama • Tucaloosa, Alabama + 386 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2016 · Synced Sep 5, 2026, 10:38 AM EDT