{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Fibroblast+Growth+Factor+23&page=2",
    "query": {
      "intervention": "Fibroblast Growth Factor 23",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 41,
    "total_pages": 5,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Fibroblast+Growth+Factor+23&page=3&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Fibroblast+Growth+Factor+23&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-06T07:45:54.678Z",
  "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": "NCT02526160",
      "title": "Study of KRN23 in Adults With X-linked Hypophosphatemia (XLH)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "X-linked Hypophosphatemia"
      ],
      "interventions": [
        {
          "name": "burosumab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "Kyowa Kirin, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 134,
      "start_date": "2015-10-22",
      "completion_date": "2018-12-06",
      "has_results": true,
      "last_update_posted_date": "2024-06-18",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 8,
      "location_summary": "Los Angeles, California • San Francisco, California • New Haven, Connecticut + 5 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02526160"
    },
    {
      "nct_id": "NCT00491322",
      "title": "Vitamin D Deficiency, Insulin Resistance and FGF-23",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Ergocalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Ergocalciferol placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 92,
      "start_date": "2006-05",
      "completion_date": "2008-02",
      "has_results": true,
      "last_update_posted_date": "2018-05-02",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00491322"
    },
    {
      "nct_id": "NCT00187629",
      "title": "Phosphate Intake's Effect on the Skeletal System - Pilot",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy",
        "Kidney Failure, Chronic"
      ],
      "interventions": [
        {
          "name": "dietary phosphorus",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "65 Years",
        "sex": "MALE",
        "summary": "21 Years to 65 Years · Male only"
      },
      "enrollment_count": 27,
      "start_date": "2004-03",
      "completion_date": "2008-07",
      "has_results": false,
      "last_update_posted_date": "2013-10-09",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00187629"
    },
    {
      "nct_id": "NCT01528176",
      "title": "Vitamin D Metabolism in Chronic Kidney Disease Patients",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Metabolism is in Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "10,000 IU of cholecalciferol for a total of 8 weeks",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Memphis VA Medical Center",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "85 Years",
        "sex": "MALE",
        "summary": "18 Years to 85 Years · Male only"
      },
      "enrollment_count": 70,
      "start_date": "2010-11",
      "completion_date": "2012-12",
      "has_results": false,
      "last_update_posted_date": "2012-02-14",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Memphis, Tennessee",
      "locations": [
        {
          "city": "Memphis",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01528176"
    },
    {
      "nct_id": "NCT03510455",
      "title": "BGJ398 for the Treatment of Tumor-Induced Osteomalacia",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Tumor-Induced Osteomalacia",
        "Oncogenic Osteomalacia"
      ],
      "interventions": [
        {
          "name": "BGJ398",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institute of Dental and Craniofacial Research (NIDCR)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "18 Years to 85 Years"
      },
      "enrollment_count": 4,
      "start_date": "2019-02-27",
      "completion_date": "2020-05-04",
      "has_results": true,
      "last_update_posted_date": "2021-04-08",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03510455"
    },
    {
      "nct_id": "NCT02589444",
      "title": "Vitamin D and Microbiota in Cystic Fibrosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "High-Dose Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Stool Sample",
          "type": "OTHER"
        },
        {
          "name": "Sputum Sample",
          "type": "OTHER"
        },
        {
          "name": "Sham Comparator",
          "type": "OTHER"
        },
        {
          "name": "Blood draw",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 41,
      "start_date": "2015-12",
      "completion_date": "2017-04",
      "has_results": false,
      "last_update_posted_date": "2017-06-14",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02589444"
    },
    {
      "nct_id": "NCT03628443",
      "title": "Cardiorenal Risk Stratification Pilot Study",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cardio-Renal Syndrome",
        "Heart Failure",
        "Chronic Kidney Diseases"
      ],
      "interventions": [
        {
          "name": "Fibroblast Growth Factor 23",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Coney Island Hospital, Brooklyn, NY",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 100,
      "start_date": "2018-07-19",
      "completion_date": "2019-12-31",
      "has_results": false,
      "last_update_posted_date": "2018-10-16",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Brooklyn, New York",
      "locations": [
        {
          "city": "Brooklyn",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03628443"
    },
    {
      "nct_id": "NCT03310684",
      "title": "Pediatric Primary Hypertension and the Renin-Angiotensin System (PHRAS)",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Pediatric Disorder",
        "Pediatric Obesity",
        "Primary Hypertension"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Wake Forest University Health Sciences",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "5 Years to 17 Years"
      },
      "enrollment_count": 35,
      "start_date": "2018-12-03",
      "completion_date": "2023-04-26",
      "has_results": false,
      "last_update_posted_date": "2025-02-28",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Winston-Salem, North Carolina",
      "locations": [
        {
          "city": "Winston-Salem",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03310684"
    },
    {
      "nct_id": "NCT00764816",
      "title": "Effect of Dietary Protein Source on Phosphaturia, PTH and FGF23 in Patients With CKD 3 and 4",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "grain (soy) protein diet",
          "type": "OTHER"
        },
        {
          "name": "casein (meat) protein diet",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Indiana University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 9,
      "start_date": "2008-10",
      "completion_date": "2011-02",
      "has_results": false,
      "last_update_posted_date": "2011-06-23",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Indianapolis, Indiana",
      "locations": [
        {
          "city": "Indianapolis",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00764816"
    },
    {
      "nct_id": "NCT01002872",
      "title": "The Effect of Lanthanum Carbonate on Fibroblast Growth Factor 23 ( FGF23) in Chronic Kidney Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Metabolic Bone Disease"
      ],
      "interventions": [
        {
          "name": "Lanthanum Carbonate (Fosrenol)",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Endeavor Health",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 19,
      "start_date": "2009-10",
      "completion_date": "2012-12",
      "has_results": true,
      "last_update_posted_date": "2023-09-21",
      "last_synced_at": "2026-10-06T07:45:54.678Z",
      "location_count": 1,
      "location_summary": "Evanston, Illinois",
      "locations": [
        {
          "city": "Evanston",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01002872"
    }
  ]
}