{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Hypereosinophilic+Syndrome+%28HES%29",
    "query": {
      "condition": "Hypereosinophilic Syndrome (HES)"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 15,
    "total_pages": 2,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Hypereosinophilic+Syndrome+%28HES%29&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-07-24T02:47:57.604Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT04191304",
      "title": "A Phase III Study to Evaluate the Efficacy and Safety of Benralizumab in Patients With Hypereosinophilic Syndrome (HES)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hypereosinophilic Syndrome"
      ],
      "interventions": [
        {
          "name": "Benralizumab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "AstraZeneca",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "130 Years",
        "sex": "ALL",
        "summary": "12 Years to 130 Years"
      },
      "enrollment_count": 134,
      "start_date": "2020-07-20",
      "completion_date": "2027-02-28",
      "has_results": true,
      "last_update_posted_date": "2026-07-10",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 8,
      "location_summary": "La Jolla, California • Atlanta, Georgia • Bethesda, Maryland + 5 more",
      "locations": [
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Bethesda",
          "state": "Maryland"
        },
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04191304"
    },
    {
      "nct_id": "NCT03801434",
      "title": "Ruxolitinib in Treating Patients With Hypereosinophilic Syndrome or Primary Eosinophilic Disorders",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "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": [
        {
          "name": "Ruxolitinib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "William Shomali",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 10,
      "start_date": "2019-11-15",
      "completion_date": "2028-12-30",
      "has_results": false,
      "last_update_posted_date": "2025-12-23",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 4,
      "location_summary": "Palo Alto, California • Portland, Oregon • Salt Lake City, Utah + 1 more",
      "locations": [
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "Portland",
          "state": "Oregon"
        },
        {
          "city": "Salt Lake City",
          "state": "Utah"
        },
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03801434"
    },
    {
      "nct_id": "NCT00255346",
      "title": "Dasatinib as Therapy for Myeloproliferative Disorders (MPDs)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Acute Myeloid Leukemia",
        "Myelodysplastic Syndromes",
        "Agnogenic Myeloid Metaplasia",
        "Myelofibrosis",
        "Hypereosinophilic Syndrome",
        "Polycythemia Vera",
        "Mastocytosis",
        "Leukemia, Myelomonocytic, Chronic"
      ],
      "interventions": [
        {
          "name": "Dasatinib (BMS-354825)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 68,
      "start_date": "2005-11-15",
      "completion_date": "2017-03-03",
      "has_results": true,
      "last_update_posted_date": "2025-12-30",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00255346"
    },
    {
      "nct_id": "NCT03306043",
      "title": "A Multi-center, Open-label Extension, Safety Study of Mepolizumab in Subjects With Hypereosinophilic Syndrome (HES) From Study 200622",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hypereosinophilic Syndrome"
      ],
      "interventions": [
        {
          "name": "Mepolizumab",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 102,
      "start_date": "2017-11-13",
      "completion_date": "2019-12-30",
      "has_results": true,
      "last_update_posted_date": "2020-06-23",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 6,
      "location_summary": "La Jolla, California • New Haven, Connecticut • Rochester, Minnesota + 3 more",
      "locations": [
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        },
        {
          "city": "Mayfield Heights",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03306043"
    },
    {
      "nct_id": "NCT00483067",
      "title": "2-Chlorodeoxyadenosine and Cytarabine in Patients With Idiopathic Hypereosinophilic Syndrome (HES)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Leukemia"
      ],
      "interventions": [
        {
          "name": "2-CdA",
          "type": "DRUG"
        },
        {
          "name": "Ara-C",
          "type": "DRUG"
        },
        {
          "name": "G-CSF (Granulocyte colony-stimulating factor)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "76 Years",
        "sex": "ALL",
        "summary": "Up to 76 Years"
      },
      "enrollment_count": 13,
      "start_date": "1998-03",
      "completion_date": "2008-07",
      "has_results": false,
      "last_update_posted_date": "2012-08-02",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00483067"
    },
    {
      "nct_id": "NCT01524536",
      "title": "Steroid Treatment for Hypereosinophilic Syndrome",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Eosinophilia",
        "Hypereosinophilic Syndrome",
        "Leukocyte Disorder",
        "Hematologic Diseases"
      ],
      "interventions": [
        {
          "name": "prednisone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "7 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "7 Years to 100 Years"
      },
      "enrollment_count": 26,
      "start_date": "2012-02-16",
      "completion_date": "2020-12-10",
      "has_results": true,
      "last_update_posted_date": "2022-02-15",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01524536"
    },
    {
      "nct_id": "NCT02836496",
      "title": "Efficacy and Safety Study of Mepolizumab in Subjects With Severe Hypereosinophilic Syndrome (HES)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hypereosinophilic Syndrome"
      ],
      "interventions": [
        {
          "name": "Mepolizumab 300 mg",
          "type": "DRUG"
        },
        {
          "name": "Placebo matching mepolizumab",
          "type": "DRUG"
        },
        {
          "name": "Active OCS capsules (5 mg prednisolone or prednisone)",
          "type": "DRUG"
        },
        {
          "name": "Placebo matching OCS capsules",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 108,
      "start_date": "2017-03-07",
      "completion_date": "2019-08-08",
      "has_results": true,
      "last_update_posted_date": "2020-02-21",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 7,
      "location_summary": "San Diego, California • New Haven, Connecticut • Rochester, Minnesota + 4 more",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        },
        {
          "city": "Mayfield Heights",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02836496"
    },
    {
      "nct_id": "NCT00230334",
      "title": "Phase II Gleevec Idiopathic Hypereosinophilic Syndrome",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Eosinophilia",
        "Hypereosinophilic Syndrome"
      ],
      "interventions": [
        {
          "name": "Gleevec",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Steven E. Coutre",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 5,
      "start_date": "2003-06-12",
      "completion_date": "2007-05",
      "has_results": false,
      "last_update_posted_date": "2021-05-10",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 1,
      "location_summary": "Stanford, California",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00230334"
    },
    {
      "nct_id": "NCT00086658",
      "title": "Intravenous Mepolizumab In Subjects With Hypereosinophilic Syndromes (HES)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hypereosinophilia",
        "Hypereosinophilic Syndrome"
      ],
      "interventions": [
        {
          "name": "mepolizumab",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 86,
      "start_date": "2004-03-23",
      "completion_date": "2006-05-01",
      "has_results": false,
      "last_update_posted_date": "2020-05-05",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 11,
      "location_summary": "San Diego, California • Denver, Colorado • Bethesda, Maryland + 8 more",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Bethesda",
          "state": "Maryland"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00086658"
    },
    {
      "nct_id": "NCT02130882",
      "title": "Study to Evaluate Safety and Efficacy of Benralizumab in Subjects With Hypereosinophilic Syndrome",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Respiratory System Agents",
        "Anti-Asthmatic Agents",
        "Hematologic Diseases",
        "Leukocyte Disorders",
        "Hypereosinophilia"
      ],
      "interventions": [
        {
          "name": "benralizumab",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 20,
      "start_date": "2014-05-19",
      "completion_date": "2023-12-31",
      "has_results": true,
      "last_update_posted_date": "2022-02-08",
      "last_synced_at": "2026-07-24T02:47:57.604Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02130882"
    }
  ]
}