{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=KRX-0502",
    "query": {
      "intervention": "KRX-0502"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 8,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-07T00:56:56.362Z",
  "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": "NCT01074125",
      "title": "A 4-Week Dose-Ranging and Efficacy Trial of KRX-0502 (Ferric Citrate) in Patients With End-Stage Renal Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hyperphosphatemia",
        "End-Stage Renal Disease"
      ],
      "interventions": [
        {
          "name": "ferric citrate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 154,
      "start_date": "2010-05",
      "completion_date": "2010-11",
      "has_results": true,
      "last_update_posted_date": "2014-12-04",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 15,
      "location_summary": "Westminster, Colorado • Pembroke Pines, Florida • Augusta, Georgia + 10 more",
      "locations": [
        {
          "city": "Westminster",
          "state": "Colorado"
        },
        {
          "city": "Pembroke Pines",
          "state": "Florida"
        },
        {
          "city": "Augusta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Springfield",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01074125"
    },
    {
      "nct_id": "NCT01191255",
      "title": "A 58-Week Safety and Efficacy Trial of Ferric Citrate in Patients With ESRD on Dialysis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hyperphosphatemia",
        "Kidney Failure"
      ],
      "interventions": [
        {
          "name": "ferric citrate, ca acetate, sevelamer carbonate, placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 441,
      "start_date": "2010-10",
      "completion_date": "2013-02",
      "has_results": true,
      "last_update_posted_date": "2014-12-10",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 52,
      "location_summary": "Tempe, Arizona • Los Angeles, California • Riverside, California + 45 more",
      "locations": [
        {
          "city": "Tempe",
          "state": "Arizona"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Riverside",
          "state": "California"
        },
        {
          "city": "Whittier",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01191255"
    },
    {
      "nct_id": "NCT03236246",
      "title": "KRX-0502 (Ferric Citrate) in Subjects With NDD-CKD and IDA (The COMPASS Trial)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Chronic Kidney Diseases",
        "Iron Deficiency Anemia"
      ],
      "interventions": [
        {
          "name": "KRX-0502",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 206,
      "start_date": "2017-08-15",
      "completion_date": "2019-09-27",
      "has_results": true,
      "last_update_posted_date": "2021-03-12",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 28,
      "location_summary": "Phoenix, Arizona • Chula Vista, California • El Centro, California + 23 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Chula Vista",
          "state": "California"
        },
        {
          "city": "El Centro",
          "state": "California"
        },
        {
          "city": "Poway",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03236246"
    },
    {
      "nct_id": "NCT02268994",
      "title": "KRX-0502 (Ferric Citrate) for the Treatment of IDA in Adult Subjects With NDD-CKD",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Anemia of Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "ferric citrate",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 234,
      "start_date": "2014-10",
      "completion_date": "2016-01",
      "has_results": true,
      "last_update_posted_date": "2018-03-22",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 36,
      "location_summary": "Phoenix, Arizona • Tempe, Arizona • Glendale, California + 29 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Tempe",
          "state": "Arizona"
        },
        {
          "city": "Glendale",
          "state": "California"
        },
        {
          "city": "La Palma",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02268994"
    },
    {
      "nct_id": "NCT00648167",
      "title": "A Safety and Tolerability Study of Zerenex (Ferric Citrate) in Patients With End-Stage Renal Disease (ESRD)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Hyperphosphatemia",
        "End-stage Renal Disease"
      ],
      "interventions": [
        {
          "name": "ferric citrate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "19 Years and older"
      },
      "enrollment_count": 55,
      "start_date": "2008-03",
      "completion_date": "2009-01",
      "has_results": true,
      "last_update_posted_date": "2017-04-04",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 1,
      "location_summary": "Nashville, Tennessee",
      "locations": [
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00648167"
    },
    {
      "nct_id": "NCT04523727",
      "title": "Study to Evaluate the Safety and Tolerability of Ferric Citrate in Children With Hyperphosphatemia Related to Chronic Kidney Disease",
      "overall_status": "SUSPENDED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hyperphosphatemia Related to Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "ferric citrate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "16 Years",
        "sex": "ALL",
        "summary": "6 Years to 16 Years"
      },
      "enrollment_count": 45,
      "start_date": "2022-06-16",
      "completion_date": "2027-10",
      "has_results": false,
      "last_update_posted_date": "2026-06-22",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 14,
      "location_summary": "Birmingham, Alabama • Phoenix, Arizona • San Francisco, California + 11 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Stanford",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04523727"
    },
    {
      "nct_id": "NCT01554982",
      "title": "A Long-Term Safety Extension Trial of Ferric Citrate in Patients With End-Stage Renal Disease (ESRD) on Dialysis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "End Stage Renal Disease",
        "Kidney Failure",
        "Renal Failure",
        "Hyperphosphatemia",
        "ESRD"
      ],
      "interventions": [
        {
          "name": "ferric citrate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 168,
      "start_date": "2012-08",
      "completion_date": "2014-08",
      "has_results": true,
      "last_update_posted_date": "2016-07-13",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 33,
      "location_summary": "Los Angeles, California • Aurora, Colorado • Westminster, Colorado + 26 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Westminster",
          "state": "Colorado"
        },
        {
          "city": "Augusta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01554982"
    },
    {
      "nct_id": "NCT01736397",
      "title": "Ferric Citrate in Managing Serum Phosphorus and Iron Deficiency in Anemic Chronic Kidney Disease (CKD) Subjects Not on Dialysis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Iron Deficiency",
        "Iron Deficiency Anemia"
      ],
      "interventions": [
        {
          "name": "Ferric Citrate",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Keryx Biopharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 149,
      "start_date": "2012-11",
      "completion_date": "2013-12",
      "has_results": true,
      "last_update_posted_date": "2017-10-20",
      "last_synced_at": "2026-09-07T00:56:56.362Z",
      "location_count": 20,
      "location_summary": "Tempe, Arizona • La Mesa, California • Sacramento, California + 17 more",
      "locations": [
        {
          "city": "Tempe",
          "state": "Arizona"
        },
        {
          "city": "La Mesa",
          "state": "California"
        },
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Edgewater",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01736397"
    }
  ]
}