{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=XXY+Syndrome",
    "query": {
      "condition": "XXY Syndrome"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 20,
    "total_pages": 2,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=XXY+Syndrome&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-07-23T10:48:22.244Z",
  "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": "NCT01817296",
      "title": "Klinefelter Fertility Preservation",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Klinefelter Syndrome"
      ],
      "interventions": [
        {
          "name": "Testicular Biopsy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Boston Children's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "25 Years",
        "sex": "MALE",
        "summary": "12 Years to 25 Years · Male only"
      },
      "enrollment_count": 15,
      "start_date": "2013-03",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2014-05-15",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01817296"
    },
    {
      "nct_id": "NCT06373861",
      "title": "Generating Advancements Through Longitudinal Analysis in X and Y Variations (GALAXY)",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Sex Chromosome Aneuploidy"
      ],
      "interventions": [
        {
          "name": "no intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "0 Days",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "0 Days to 100 Years"
      },
      "enrollment_count": 5000,
      "start_date": "2022-04-28",
      "completion_date": "2037-04",
      "has_results": false,
      "last_update_posted_date": "2024-04-18",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06373861"
    },
    {
      "nct_id": "NCT01585831",
      "title": "Study of Psychological and Motor Effects of Testosterone in Adolescents With XXY/Klinefelter Syndrome",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Klinefelter Syndrome",
        "XXY Syndrome"
      ],
      "interventions": [
        {
          "name": "Testosterone gel 1%",
          "type": "DRUG"
        },
        {
          "name": "Placebo gel",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": "18 Years",
        "sex": "MALE",
        "summary": "8 Years to 18 Years · Male only"
      },
      "enrollment_count": 48,
      "start_date": "2012-03",
      "completion_date": "2017-10",
      "has_results": true,
      "last_update_posted_date": "2021-08-10",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01585831"
    },
    {
      "nct_id": "NCT02461303",
      "title": "Fertility Assessment in Patients With Klinefelter Syndrome",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Klinefelter Syndrome"
      ],
      "interventions": [
        {
          "name": "Counseling",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Pittsburgh",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "25 Years",
        "sex": "MALE",
        "summary": "12 Years to 25 Years · Male only"
      },
      "enrollment_count": 6,
      "start_date": "2016-01-07",
      "completion_date": "2017-12-12",
      "has_results": false,
      "last_update_posted_date": "2018-07-24",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 2,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        },
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02461303"
    },
    {
      "nct_id": "NCT03396562",
      "title": "The eXtroardinarY Babies Study: Natural History of Health and Neurodevelopment in Infants and Young Children With Sex Chromosome Trisomy",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Klinefelter Syndrome",
        "Trisomy X",
        "XYY Syndrome",
        "XXXY and XXXXY Syndrome",
        "Xxyy Syndrome",
        "Xyyy Syndrome",
        "Xxxx Syndrome",
        "Xxxxx Syndrome",
        "Xxxyy Syndrome",
        "Xxyyy Syndrome",
        "Xyyyy Syndrome",
        "Male With Sex Chromosome Mosaicism"
      ],
      "interventions": [
        {
          "name": "Assessments of Development and Growth",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Weeks",
        "maximum_age": "13 Months",
        "sex": "ALL",
        "summary": "6 Weeks to 13 Months"
      },
      "enrollment_count": 300,
      "start_date": "2017-09-29",
      "completion_date": "2028-03-01",
      "has_results": false,
      "last_update_posted_date": "2024-05-09",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 2,
      "location_summary": "Aurora, Colorado • Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03396562"
    },
    {
      "nct_id": "NCT02723305",
      "title": "Cardiometabolic Profiles of Boys With Klinefelter Syndrome",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Klinefelter Syndrome",
        "47,XXY",
        "Sex Chromosome Aneuploidy",
        "XXY Syndrome"
      ],
      "interventions": [
        {
          "name": "No intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "17 Years",
        "sex": "MALE",
        "summary": "12 Years to 17 Years · Male only"
      },
      "enrollment_count": 31,
      "start_date": "2016-05",
      "completion_date": "2017-12",
      "has_results": false,
      "last_update_posted_date": "2022-03-08",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02723305"
    },
    {
      "nct_id": "NCT03836300",
      "title": "Parent and Infant Inter(X)Action Intervention (PIXI)",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Fragile X Syndrome",
        "Angelman Syndrome",
        "Prader-Willi Syndrome",
        "Dup15Q Syndrome",
        "Duchenne Muscular Dystrophy",
        "Phelan-McDermid Syndrome",
        "Rett Syndrome",
        "Smith Magenis Syndrome",
        "Williams Syndrome",
        "Turner Syndrome",
        "Klinefelter Syndrome",
        "Chromosome 22q11.2 Deletion Syndrome",
        "Tuberous Sclerosis",
        "Down Syndrome"
      ],
      "interventions": [
        {
          "name": "Parent-Infant Inter(X)action Intervention (PIXI)",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "RTI International",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "99 Years",
        "sex": "ALL",
        "summary": "Up to 99 Years"
      },
      "enrollment_count": 120,
      "start_date": "2018-11-30",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-07-13",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Research Triangle Park, North Carolina",
      "locations": [
        {
          "city": "Research Triangle Park",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03836300"
    },
    {
      "nct_id": "NCT02061384",
      "title": "RA-2 13-cis Retinoic Acid (Isotretinoin)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Male Infertility",
        "Klinefelter's Syndrome",
        "Y-chromosome Microdeletions"
      ],
      "interventions": [
        {
          "name": "13-cis retinoic acid",
          "type": "DRUG"
        },
        {
          "name": "Calcitriol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Washington",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "60 Years",
        "sex": "MALE",
        "summary": "21 Years to 60 Years · Male only"
      },
      "enrollment_count": 20,
      "start_date": "2014-08",
      "completion_date": "2018-12",
      "has_results": true,
      "last_update_posted_date": "2021-08-02",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Seattle, Washington",
      "locations": [
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02061384"
    },
    {
      "nct_id": "NCT00347464",
      "title": "Adaptive Behavior Assessment of Men With 49, XXXXY, Klinefelter Syndrome",
      "overall_status": "WITHDRAWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Klinefelter Syndrome"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "2 Years",
        "maximum_age": "21 Years",
        "sex": "MALE",
        "summary": "2 Years to 21 Years · Male only"
      },
      "enrollment_count": 0,
      "start_date": "2006-06",
      "completion_date": "2008-08",
      "has_results": false,
      "last_update_posted_date": "2015-12-03",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Madison, Wisconsin",
      "locations": [
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00347464"
    },
    {
      "nct_id": "NCT02408445",
      "title": "Body Composition in Infants With Klinefelter Syndrome and Effects of Testosterone Treatment",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Klinefelter Syndrome"
      ],
      "interventions": [
        {
          "name": "testosterone cypionate 200mg/ml",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "42 Days",
        "maximum_age": "108 Days",
        "sex": "MALE",
        "summary": "42 Days to 108 Days · Male only"
      },
      "enrollment_count": 20,
      "start_date": "2015-05-08",
      "completion_date": "2020-01-01",
      "has_results": true,
      "last_update_posted_date": "2020-04-15",
      "last_synced_at": "2026-07-23T10:48:22.244Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02408445"
    }
  ]
}