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Disease

Hypereosinophilic syndrome

Late-stage therapeutic development
Also known as HES, eosinophilic leukocytosis, hypereosinophilic disease, hypereosinophilic disorder+1 more

HES, eosinophilic leukocytosis, hypereosinophilic disease, hypereosinophilic disorder, eosinophilia.

14
Clinical trials
4
Associated genes
4
Related proteins
Latest activity
beta

Recent clinical, regulatory, research and industry developments relating to this disease.

Approval: Imatinib Accord (EMA)

Regulatory2013-06-30EMA

Approval: Imatinib Teva (EMA)

Regulatory2013-01-07EMA

Approval: Glivec (EMA)

Regulatory2001-11-07EMA

What's happening now

An analyst briefing on current research, clinical, regulatory and industry activity surrounding this disease.

Executive briefingUpdating summary…Momentum: Moderate
Key developments
  • 3 clinical trials expected to report results, the earliest in Q4 2026.
Upcoming Milestones
Clinical Milestones6View
Results posted 3
Results expected 3
Activity timeline6

Therapeutic landscape

Therapies with a regulatory footing for this condition, alongside the wider set of agents co-studied with it in the literature.

Approved & established therapies
Mepolizumabapproved

Approval — Severe eosinophilic asthmaNucala is indicated as an add-on treatment for severe refractor… (2015)

Imatinibapproved

Approval — Imatinib Accord is indicated for the treatment of adult and paediatric patients with new… (2013)

Clinical trials

7 sponsors · 0 new · 1 completed in the last 12 months (net +0)

The current development programme across all trial phases.

Clinical programme
14
All trials
5
Active
7
Late-stage
6
Completed
Late-stage studies

A Randomized, Double-blind, Placebo-controlled Study to Investigate the Efficacy and Safety of Depemokimab in Adults With Hypereosinophilic Syndrome (HES)

Phase 3 · Recruiting · GlaxoSmithKline

A Multicentre, Randomised, Double-blind, Parallel-group, Placebo-controlled, 24-Week Phase III Study With an Open-label Extension to Evaluate the Efficacy and Safety of Benralizumab in Patients With Hypereosinophilic Syndrome (HES)

Phase 3 · Active, not recruiting · AstraZeneca

Assessment of Glucocorticoid Responsiveness and Mechanisms of Resistance in Hypereosinophilic Syndromes

Phase 4 · Completed · National Institute of Allergy and Infectious Diseases (NIAID)

A Multicenter, Double-blind, Placebo-controlled, Study to to Evaluate the Corticosteroid- Sparing Effects of Mepolizumab in Subjects With Hypereosinophilic Syndromes (HES) and Evaluate Efficacy and Safety of Mepolizumab in Controlling the Clinical Signs and Symptoms of Subjects With HES

Phase 3 · Completed · GlaxoSmithKline

A Phase 3, 52-week, Open-label, Single Arm Study to Investigate the Efficacy and Safety of Mepolizumab SC in Participants Aged 6 to 17 Years With Hypereosinophilic Syndrome

Phase 3 · Completed · GlaxoSmithKline

Study 200622: A Randomized, Double-blind, Placebo-controlled Study to Investigate the Efficacy and Safety of Mepolizumab in the Treatment of Adolescent and Adult Subjects With Severe Hypereosinophilic Syndrome

Phase 3 · Completed · GlaxoSmithKline
Recently completed

A Phase 3, 52-week, Open-label, Single Arm Study to Investigate the Efficacy and Safety of Mepolizumab SC in Participants Aged 6 to 17 Years With Hypereosinophilic Syndrome

Phase 3 · Completed · GlaxoSmithKline

Assessment of Glucocorticoid Responsiveness and Mechanisms of Resistance in Hypereosinophilic Syndromes

Phase 4 · Completed · National Institute of Allergy and Infectious Diseases (NIAID)

Study 200622: A Randomized, Double-blind, Placebo-controlled Study to Investigate the Efficacy and Safety of Mepolizumab in the Treatment of Adolescent and Adult Subjects With Severe Hypereosinophilic Syndrome

Phase 3 · Completed · GlaxoSmithKline

Therapy of Myeloid Metaplasia-Myelofibrosis, Atypical Chronic Myeloid or Myelomonocytic Leukemia, C-Kit Positive Acute Myeloid Leukemia (AML) or High-Risk Myelodysplastic Syndrome (AML-MDS), Hypereosinophilic Syndrome, Polycythemia Vera, and Mastocytosis With Dasatinib (BMS-354825)

Phase 2 · Completed · M.D. Anderson Cancer Center

Therapy of Hypereosinophilic Syndrome, Polycythemia Vera, Atypical CML or CMML With Platelet Derived Growth Factor (PDGF-R) Fusion Genes, or Mastocytosis With Imatinib Mesylate (STI571)

N/A · Completed · M.D. Anderson Cancer Center

A Multicenter, Double-blind, Placebo-controlled, Study to to Evaluate the Corticosteroid- Sparing Effects of Mepolizumab in Subjects With Hypereosinophilic Syndromes (HES) and Evaluate Efficacy and Safety of Mepolizumab in Controlling the Clinical Signs and Symptoms of Subjects With HES

Phase 3 · Completed · GlaxoSmithKline

Regulatory timeline

Drug regulatory events matched to this condition by indication — EMA.

First approvals
2015emaApproval — Mepolizumab· Severe eosinophilic asthmaNucala is indicated as an add-on treatment for severe refractory eosinophilic asthma in adults, adolescents and children aged 6 years and older . Chronic rhinosinusitis with nasal polyps (CRSwNP)Nucala is indicated as an add-on therapy with intranasal corticosteroids for the treatment of adult patients with severe CRSwNP for whom therapy with systemic corticosteroids and/or surgery do not provide adequate control. Eosinophilic granulomatosis with polyangiitis (EGPA)Nucala is indicated as an add-on treatment for patients aged 6 years and older with relapsing-remitting or refractory eosinophilic granulomatosis with polyangiitis (EGPA). Hypereosinophilic syndrome (HES)Nucala is indicated as an add-on treatment for adult patients with inadequately controlled hypereosinophilic syndrome without an identifiable non-haematologic secondary cause. source ↗
2013emaApproval — Imatinib· Imatinib Accord is indicated for the treatment of adult and paediatric patients with newly diagnosed Philadelphia chromosome (bcr-abl) positive (Ph+) chronic myeloid leukaemia (CML) for whom bone marrow transplantation is not considered as the first line of treatment. adult and paediatric patients with Ph+ CML in chronic phase after failure of interferon-alpha therapy, or in accelerated phase or blast crisis.  adult and paediatric patients with newly diagnosed Philadelphia chromosome positive acute lymphoblastic leukaemia (Ph+ ALL) integrated with chemotherapy.  adult patients with relapsed or refractory Ph+ ALL as monotherapy.  adult patients with myelodysplastic/myeloproliferative diseases (MDS/MPD) associated with platelet-derived growth factor receptor (PDGFR) gene re-arrangements.  adult patients with advanced hypereosinophilic syndrome (HES) and/or chronic eosinophilic leukaemia (CEL) with FIP1L1-PDGFR? rearrangement.  adult patients with unresectable dermatofibrosarcoma protuberans (DFSP) and adult patients with recurrent and/or metastatic DFSP who are not eligible for surgery. the treatment of adult patients with Kit (CD 117) positive unresectable and/or metastatic malignant gastrointestinal stromal tumours (GIST).  the adjuvant treatment of adult patients who are at significant risk of relapse following resection of Kit (CD117)-positive GIST.  Patients who have a low or very low risk of recurrence should not receive adjuvant treatment The effect of imatinib on the outcome of bone marrow transplantation has not been determined. In adult and paediatric patients, the effectiveness of imatinib is based on overall haematological and cytogenetic response rates and progression-free survival in CML, on haematological and cytogenetic response rates in Ph+ ALL, MDS/MPD, on haematological response rates in HES/CEL and on objective response rates in adult patients with unresectable and/or metastatic DFSP. The experience with imatinib in patients with MDS/MPD associated with PDGFR gene re-arrangements is very limited (see section 5.1). Except in newly diagnosed chronic phase CML, there are no controlled trials demonstrating a clinical benefit or increased survival for these diseases. source ↗
2013emaApproval — Imatinib· Imatinib Teva is indicated for the treatment of Adult and paediatric patients with newly diagnosed Philadelphia chromosome (bcr?abl) positive (Ph+) chronic myeloid leukaemia (CML) for whom bone marrow transplantation is not considered as the first line of treatment. Adult and paediatric patients with Ph+ CML in chronic phase after failure of interferon?alpha therapy, or in accelerated phase or blast crisis. Adult and paediatric patients with newly diagnosed Philadelphia chromosome positive acute lymphoblastic leukaemia (Ph+ ALL) integrated with chemotherapy. Adult patients with relapsed or refractory Ph+ ALL as monotherapy. Adult patients with myelodysplastic/myeloproliferative diseases (MDS/MPD) associated with platelet-derived growth factor receptor (PDGFR) gene re-arrangements. Adult patients with advanced hypereosinophilic syndrome (HES) and/or chronic eosinophilic leukaemia (CEL) with FIP1L1-PDGFR? rearrangement. The effect of imatinib on the outcome of bone marrow transplantation has not been determined. Imatinib Teva is indicated for the treatment of adult patients with Kit (CD 117) positive unresectable and/or metastatic malignant gastrointestinal stromal tumours (GIST). the adjuvant treatment of adult patients who are at significant risk of relapse following resection of Kit (CD117)-positive GIST. Patients who have a low or very low risk of recurrence should not receive adjuvant treatment. The treatment of adult patients with unresectable dermatofibrosarcoma protuberans (DFSP) and adult patients with recurrent and/or metastatic DFSP who are not eligible for surgery. In adult and paediatric patients, the effectiveness of imatinib is based on overall haematological and cytogenetic response rates and progression-free survival in CML, on haematological and cytogenetic response rates in Ph+ ALL, MDS/MPD, on haematological response rates in HES/CEL and on objective response rates in adult patients with unresectable and/or metastatic GIST and DFSP and on recurrence-free survival in adjuvant GIST. The experience with imatinib in patients with MDS/MPD associated with PDGFR gene re-arrangements is very limited (see section 5.1). Except in newly diagnosed chronic phase CML, there are no controlled trials demonstrating a clinical benefit or increased survival for these diseases. source ↗
2001emaApproval — Imatinib· Glivec is indicated for the treatment of adult and paediatric patients with newly diagnosed Philadelphia-chromosome (bcr-abl)-positive (Ph+) chronic myeloid leukaemia (CML) for whom bone-marrow transplantation is not considered as the first line of treatment; adult and paediatric patients with Ph+ CML in chronic phase after failure of interferon-alpha therapy, or in accelerated phase or blast crisis; adult and paediatric patients with newly diagnosed Philadelphia-chromosome-positive acute lymphoblastic leukaemia (Ph+ ALL) integrated with chemotherapy; adult patients with relapsed or refractory Ph+ ALL as monotherapy; adult patients with myelodysplastic / myeloproliferative diseases (MDS / MPD) associated with platelet-derived growth factor receptor (PDGFR) gene re-arrangements; adult patients with advanced hypereosinophilic syndrome (HES) and / or chronic eosinophilic leukaemia (CEL) with FIP1L1-PDGFRa rearrangement. The effect of Glivec on the outcome of bone-marrow transplantation has not been determined. Glivec is indicated for: the treatment of adult patients with Kit (CD 117)-positive unresectable and / or metastatic malignant gastrointestinal stromal tumours (GIST); the adjuvant treatment of adult patients who are at significant risk of relapse following resection of Kit (CD117)-positive GIST. Patients who have a low or very low risk of recurrence should not receive adjuvant treatment; the treatment of adult patients with unresectable dermatofibrosarcoma protuberans (DFSP) and adult patients with recurrent and / or metastatic DFSP who are not eligible for surgery. In adult and paediatric patients, the effectiveness of Glivec is based on overall haematological and cytogenetic response rates and progression-free survival in CML, on haematological and cytogenetic response rates in Ph+ ALL, MDS / MPD, on haematological response rates in HES / CEL and on objective response rates in adult patients with unresectable and / or metastatic GIST and DFSP and on recurrence-free survival in adjuvant GIST. The experience with Glivec in patients with MDS / MPD associated with PDGFR gene re-arrangements is very limited (see section 5.1). Except in newly diagnosed chronic phase CML, there are no controlled trials demonstrating a clinical benefit or increased survival for these diseases. source ↗

European Medicines Agency (CC BY 4.0). Events are matched to this condition by drug indication text — approvals/updates for drugs indicated for it, not disease-specific acts.

Associated genes

4 matches

Genes associated with this disease in the canonical knowledge graph (Open Targets evidence). Number shows the association score.

ABL10.56BCR0.56IL50.52IL5RA0.37

Disease biology

4 matches

Proteins whose encoding gene is associated with this disease, reached through the canonical gene→disease graph. Number shows the gene's association score.

Tyrosine-protein kinase ABL1via ABL10.56Breakpoint cluster region proteinvia BCR0.56Interleukin-5via IL50.52Interleukin-5 receptor subunit alphavia IL5RA0.37

Reference

Authoritative identity, definition & identifiers.

Defined in MeSH

A heterogeneous group of disorders with the common feature of prolonged eosinophilia of unknown cause and associated organ system dysfunction, including the heart, central nervous system, kidneys, lungs, gastrointestinal tract, and skin. There is a massive increase in the number of EOSINOPHILS in the blood, mimicking leukemia, and extensive eosinophilic infiltration of the various organs.

Synonyms

HES, eosinophilic leukocytosis, hypereosinophilic disease, hypereosinophilic disorder, eosinophilia

References & data sources
  • Disease identity & definition — NLM Medical Subject Headings (MeSH), public domain
  • Clinical trials — ClinicalTrials.gov (U.S. National Library of Medicine)
  • Related entities are derived from literature co-mention (studied together) — associative, not causal.