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Showing 1–15 of 15 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Hypereosinophilic Syndrome (HES) Clear all
Active, not recruiting Phase 3 Interventional Results available

A Phase III Study to Evaluate the Efficacy and Safety of Benralizumab in Patients With Hypereosinophilic Syndrome (HES)

NCT04191304
View directory record Official record
Conditions
Hypereosinophilic Syndrome
Interventions
Benralizumab, Placebo
Biological
Lead sponsor
AstraZeneca
Industry
Eligibility
12 Years to 130 Years
Enrollment
134 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
8
States / cities
La Jolla, California • Atlanta, Georgia • Bethesda, Maryland + 5 more
Source: ClinicalTrials.gov public record
Updated Jul 9, 2026 · Synced Jul 23, 2026, 6:11 PM EDT
Recruiting Phase 2 Interventional

Ruxolitinib in Treating Patients With Hypereosinophilic Syndrome or Primary Eosinophilic Disorders

NCT03801434
View directory record Official record
Conditions
BCR-JAK2 Fusion Protein Expression, Blasts 20 Percent or Less of Peripheral Blood White Cells, Blasts More Than 5 Percent of Bone Marrow Nucleated Cells, Blasts More Than 5 Percent of Peripheral Blood White Cells, Blasts Under 20 Percent of Bone Marrow Nucleated Cells, Chronic Eosinophilic Leukemia, Not Otherwise Specified, Eosinophilia, Hepatomegaly, Hypereosinophilic Syndrome, JAK2 Gene Mutation, Splenomegaly, TEL-JAK2 Fusion Protein Expression
Interventions
Ruxolitinib
Drug
Lead sponsor
William Shomali
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2028
U.S. locations
4
States / cities
Palo Alto, California • Portland, Oregon • Salt Lake City, Utah + 1 more
Source: ClinicalTrials.gov public record
Updated Dec 22, 2025 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Phase 2 Interventional Results available

Dasatinib as Therapy for Myeloproliferative Disorders (MPDs)

NCT00255346
View directory record Official record
Conditions
Acute Myeloid Leukemia, Myelodysplastic Syndromes, Agnogenic Myeloid Metaplasia, Myelofibrosis, Hypereosinophilic Syndrome, Polycythemia Vera, Mastocytosis, Leukemia, Myelomonocytic, Chronic
Interventions
Dasatinib (BMS-354825)
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2017
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 29, 2025 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Phase 3 Interventional Results available

A Multi-center, Open-label Extension, Safety Study of Mepolizumab in Subjects With Hypereosinophilic Syndrome (HES) From Study 200622

NCT03306043
View directory record Official record
Conditions
Hypereosinophilic Syndrome
Interventions
Mepolizumab
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
12 Years and older
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
6
States / cities
La Jolla, California • New Haven, Connecticut • Rochester, Minnesota + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 22, 2020 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Phase 2 Interventional

2-Chlorodeoxyadenosine and Cytarabine in Patients With Idiopathic Hypereosinophilic Syndrome (HES)

NCT00483067
View directory record Official record
Conditions
Leukemia
Interventions
2-CdA, Ara-C, G-CSF (Granulocyte colony-stimulating factor)
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
Up to 76 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2008
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 1, 2012 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Phase 4 Interventional Results available

Steroid Treatment for Hypereosinophilic Syndrome

NCT01524536
View directory record Official record
Conditions
Eosinophilia, Hypereosinophilic Syndrome, Leukocyte Disorder, Hematologic Diseases
Interventions
prednisone
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
7 Years to 100 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2020
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 14, 2022 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety Study of Mepolizumab in Subjects With Severe Hypereosinophilic Syndrome (HES)

NCT02836496
View directory record Official record
Conditions
Hypereosinophilic Syndrome
Interventions
Mepolizumab 300 mg, Placebo matching mepolizumab, Active OCS capsules (5 mg prednisolone or prednisone), Placebo matching OCS capsules
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
12 Years and older
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
7
States / cities
San Diego, California • New Haven, Connecticut • Rochester, Minnesota + 4 more
Source: ClinicalTrials.gov public record
Updated Feb 20, 2020 · Synced Jul 23, 2026, 6:11 PM EDT
Terminated Phase 2 Interventional

Phase II Gleevec Idiopathic Hypereosinophilic Syndrome

NCT00230334
View directory record Official record
Conditions
Eosinophilia, Hypereosinophilic Syndrome
Interventions
Gleevec
Drug
Lead sponsor
Steven E. Coutre
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2007
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated May 9, 2021 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Phase 3 Interventional

Intravenous Mepolizumab In Subjects With Hypereosinophilic Syndromes (HES)

NCT00086658
View directory record Official record
Conditions
Hypereosinophilia, Hypereosinophilic Syndrome
Interventions
mepolizumab
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 75 Years
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
11
States / cities
San Diego, California • Denver, Colorado • Bethesda, Maryland + 8 more
Source: ClinicalTrials.gov public record
Updated May 4, 2020 · Synced Jul 23, 2026, 6:11 PM EDT
Not listed Phase 2Phase 3 Interventional Results available

Study to Evaluate Safety and Efficacy of Benralizumab in Subjects With Hypereosinophilic Syndrome

NCT02130882
View directory record Official record
Conditions
Respiratory System Agents, Anti-Asthmatic Agents, Hematologic Diseases, Leukocyte Disorders, Hypereosinophilia
Interventions
benralizumab, Placebo
Drug · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 75 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2023
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 7, 2022 · Synced Jul 23, 2026, 6:11 PM EDT
Completed No phase listed Observational

TrinetX Study of Hypereosinophilic Syndrome (HES) Without an Identifiable Non-haematological Secondary Cause

NCT06172751
View directory record Official record
Conditions
Hypereosinophilic Syndrome (HES)
Interventions
no intervention
Other
Lead sponsor
AstraZeneca
Industry
Eligibility
Not listed
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 11, 2025 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Not applicable Interventional Results available

Therapy of HES, PV, Atypical Chronic Myelocytic Leukemia (CML) or Chronic Myelomonocytic Leukemia (CMML), and Mastocytosis With Imatinib Mesylate

NCT00038675
View directory record Official record
Conditions
Chronic Myelomonocytic Leukemia, Chronic Myeloid Leukemia, Polycythemia Vera, Hypereosinophilic Syndrome, Mastocytosis
Interventions
Imatinib Mesylate (Gleevec)
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
Not listed
Enrollment
125 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2013
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 3, 2022 · Synced Jul 23, 2026, 6:11 PM EDT
Active, not recruiting Phase 2 Interventional

Tyrosine Kinase Inhibition to Treat Myeloid Hypereosinophilic Syndrome

NCT00044304
View directory record Official record
Conditions
Eosinophilic Myeloid Neoplasm, Hypereosinophilic Syndrome
Interventions
Imatinib, Ruxolitinib
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
2 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2027
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 15, 2026 · Synced Jul 23, 2026, 6:11 PM EDT
Recruiting Phase 3 Interventional

Depemokimab in Participants With Hypereosinophilic Syndrome, Efficacy, and Safety Trial

NCT05334368
View directory record Official record
Conditions
Hypereosinophilic Syndrome
Interventions
Depemokimab, Placebo
Drug · Other
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years and older
Enrollment
123 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2028
U.S. locations
11
States / cities
San Diego, California • Atlanta, Georgia • Boston, Massachusetts + 8 more
Source: ClinicalTrials.gov public record
Updated Nov 24, 2025 · Synced Jul 23, 2026, 6:11 PM EDT
Completed Phase 1Phase 2 Interventional Results available

A Study of Oral AMN107 in Adults With Chronic Myelogenous Leukemia (CML) or Other Hematologic Malignancies

NCT00109707
View directory record Official record
Conditions
Chronic Myelogenous Leukemia, Acute Lymphoblastic Leukemia (Philadelphia Chromosome Positive), Hypereosinophilic Syndrome, Systemic Mastocytosis
Interventions
Nilotinib
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
507 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
24
States / cities
Duarte, California • Stanford, California • Aurora, Colorado + 20 more
Source: ClinicalTrials.gov public record
Updated Jun 28, 2021 · Synced Jul 23, 2026, 6:11 PM EDT