{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Retroperitoneal+Sarcoma",
    "query": {
      "condition": "Retroperitoneal Sarcoma"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 25,
    "total_pages": 3,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Retroperitoneal+Sarcoma&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-05-22T00:07:44.177Z",
  "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": "NCT05302570",
      "title": "Neoadjuvant Short-course Hypofractionated PBT for Non-metastatic RPS",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Retroperitoneal Sarcoma"
      ],
      "interventions": [
        {
          "name": "Hypofractionated Proton Beam Therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "RADIATION"
      ],
      "sponsor": "Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 0,
      "start_date": "2022-12",
      "completion_date": "2027-12",
      "has_results": false,
      "last_update_posted_date": "2022-12-15",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 2,
      "location_summary": "Washington D.C., District of Columbia • Baltimore, Maryland",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05302570"
    },
    {
      "nct_id": "NCT04033081",
      "title": "Registry of Sarcoma Patients Treated With Permanently Implantable LDR CivaSheet®",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Sarcoma"
      ],
      "interventions": [
        {
          "name": "CivaSheet",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "CivaTech Oncology",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 100,
      "start_date": "2020-04-30",
      "completion_date": "2030-04",
      "has_results": false,
      "last_update_posted_date": "2026-03-23",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04033081"
    },
    {
      "nct_id": "NCT00091351",
      "title": "Surgery With or Without Radiation Therapy in Treating Patients With Primary Soft Tissue Sarcoma of the Retroperitoneum or Pelvis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Sarcoma"
      ],
      "interventions": [
        {
          "name": "conventional surgery",
          "type": "PROCEDURE"
        },
        {
          "name": "radiation therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "RADIATION"
      ],
      "sponsor": "Alliance for Clinical Trials in Oncology",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 370,
      "start_date": "2004-08",
      "completion_date": "2006-02",
      "has_results": false,
      "last_update_posted_date": "2016-07-06",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 55,
      "location_summary": "Little Rock, Arkansas • Duarte, California • Aurora, Colorado + 42 more",
      "locations": [
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Duarte",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Gainesville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00091351"
    },
    {
      "nct_id": "NCT06436846",
      "title": "Genomic Risk in Retroperitoneal Sarcoma",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Retroperitoneal Liposarcoma",
        "Soft Tissue Sarcoma"
      ],
      "interventions": [
        {
          "name": "Biospecimen sample collection during standard-of-care surgery",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Fox Chase Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 50,
      "start_date": "2022-03-07",
      "completion_date": "2027-08-01",
      "has_results": false,
      "last_update_posted_date": "2024-05-31",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06436846"
    },
    {
      "nct_id": "NCT03838718",
      "title": "REtroperitoneal SArcoma Registry: an International Prospective Initiative",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Retroperitoneal Sarcoma"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Fondazione IRCCS Istituto Nazionale dei Tumori, Milano",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 2000,
      "start_date": "2016-09-01",
      "completion_date": "2030-12-31",
      "has_results": false,
      "last_update_posted_date": "2019-02-12",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 6,
      "location_summary": "Los Angeles, California • Jacksonville, Florida • Tampa, Florida + 3 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Tampa",
          "state": "Florida"
        },
        {
          "city": "Emory",
          "state": "Georgia"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03838718"
    },
    {
      "nct_id": "NCT06327477",
      "title": "Proton-Spatially Fractionated Radiotherapy and Standard Radiation Therapy for the Treatment of Newly Diagnosed Retroperitoneal Soft Tissue Sarcoma",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Retroperitoneal Sarcoma"
      ],
      "interventions": [
        {
          "name": "Biopsy",
          "type": "PROCEDURE"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Intensity-Modulated Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Resection",
          "type": "PROCEDURE"
        },
        {
          "name": "Spatially-fractionated Radiation Therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "RADIATION"
      ],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 28,
      "start_date": "2024-04-02",
      "completion_date": "2028-07-01",
      "has_results": false,
      "last_update_posted_date": "2025-10-20",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06327477"
    },
    {
      "nct_id": "NCT04420975",
      "title": "Nivolumab and BO-112 Before Surgery for the Treatment of Resectable Soft Tissue Sarcoma",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Leiomyosarcoma",
        "Malignant Peripheral Nerve Sheath Tumor",
        "Myxofibrosarcoma",
        "Pleomorphic Rhabdomyosarcoma",
        "Resectable Dedifferentiated Liposarcoma",
        "Resectable Soft Tissue Sarcoma",
        "Resectable Undifferentiated Pleomorphic Sarcoma",
        "Soft Tissue Fibrosarcoma",
        "Spindle Cell Sarcoma",
        "Stage I Retroperitoneal Sarcoma AJCC (American Joint Committee on Cancer) v8",
        "Stage I Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8",
        "Stage IA Retroperitoneal Sarcoma AJCC v8",
        "Stage IA Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8",
        "Stage IB Retroperitoneal Sarcoma AJCC v8",
        "Stage IB Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8",
        "Stage II Retroperitoneal Sarcoma AJCC v8",
        "Stage II Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8",
        "Stage III Retroperitoneal Sarcoma AJCC v8",
        "Stage III Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8",
        "Stage IIIA Retroperitoneal Sarcoma AJCC v8",
        "Stage IIIA Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8",
        "Stage IIIB Retroperitoneal Sarcoma AJCC v8",
        "Stage IIIB Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8",
        "Storiform-Pleomorphic Malignant Fibrous Histiocytoma",
        "Synovial Sarcoma",
        "Undifferentiated High Grade Pleomorphic Sarcoma of Bone",
        "Undifferentiated Pleomorphic Sarcoma",
        "Undifferentiated Pleomorphic Sarcoma With Osteoclast-Like Giant Cells",
        "Undifferentiated Pleomorphic Sarcoma, Inflammatory Variant",
        "Undifferentiated Spindle Cell Sarcoma"
      ],
      "interventions": [
        {
          "name": "Definitive Surgical Resection",
          "type": "PROCEDURE"
        },
        {
          "name": "Nanoplexed Poly I:C BO-112",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Nivolumab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Radiation Therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "BIOLOGICAL",
        "RADIATION"
      ],
      "sponsor": "Jonsson Comprehensive 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": 14,
      "start_date": "2020-10-14",
      "completion_date": "2028-01-31",
      "has_results": false,
      "last_update_posted_date": "2026-03-10",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04420975"
    },
    {
      "nct_id": "NCT06025747",
      "title": "Evaluation of Abemaciclib and Radiation Therapy Before Surgery for the Treatment of High-Risk Adipocytic Retroperitoneal Sarcoma",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Retroperitoneal Sarcoma"
      ],
      "interventions": [
        {
          "name": "Abemaciclib",
          "type": "DRUG"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Therapeutic Surgical Procedure",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "PROCEDURE",
        "RADIATION"
      ],
      "sponsor": "University of Washington",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 18,
      "start_date": "2025-03-19",
      "completion_date": "2029-03-03",
      "has_results": false,
      "last_update_posted_date": "2026-03-30",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 1,
      "location_summary": "Seattle, Washington",
      "locations": [
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06025747"
    },
    {
      "nct_id": "NCT07377747",
      "title": "Prospective Study Evaluating the Treatment Outcomes for Localised Recurrent, Resectable Retroperitoneal Liposarcoma",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Retroperitoneal Liposarcoma"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Australia and New Zealand Sarcoma Association",
      "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": "2024-09-05",
      "completion_date": "2032-12",
      "has_results": false,
      "last_update_posted_date": "2026-01-30",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 3,
      "location_summary": "Atlanta, Georgia • Columbus, Ohio • Houston, Texas",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Columbus",
          "state": "Ohio"
        },
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07377747"
    },
    {
      "nct_id": "NCT01659203",
      "title": "Proton or Photon RT for Retroperitoneal Sarcomas",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Retroperitoneal Sarcoma"
      ],
      "interventions": [
        {
          "name": "IG-IMPT",
          "type": "RADIATION"
        },
        {
          "name": "IG IMRT",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "RADIATION"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 80,
      "start_date": "2012-12",
      "completion_date": "2027-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-03-19",
      "last_synced_at": "2026-05-22T00:07:44.177Z",
      "location_count": 10,
      "location_summary": "Chicago, Illinois • Boston, Massachusetts • Rochester, Minnesota + 6 more",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "Creve Coeur",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01659203"
    }
  ]
}