{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=No+Intervention%3A+Observational+Cohort",
    "query": {
      "intervention": "No Intervention: Observational Cohort"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 142,
    "total_pages": 15,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=No+Intervention%3A+Observational+Cohort&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-26T11:55:55.306Z",
  "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": "NCT01873235",
      "title": "PKD Clinical and Translational Core Study",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Polycystic Kidney Disease"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 350,
      "start_date": "2013-03",
      "completion_date": "2030-06",
      "has_results": false,
      "last_update_posted_date": "2025-09-11",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01873235"
    },
    {
      "nct_id": "NCT04486378",
      "title": "A Phase II Clinical Trial Comparing the Efficacy of RO7198457 Versus Watchful Waiting in Patients With ctDNA-positive, Resected Stage II (High Risk) and Stage III Colorectal Cancer",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Colorectal Cancer Stage II",
        "Colorectal Cancer Stage III"
      ],
      "interventions": [
        {
          "name": "RO7198457 intravenous (IV)",
          "type": "DRUG"
        },
        {
          "name": "Observational group (no intervention)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "BioNTech SE",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 327,
      "start_date": "2021-03-08",
      "completion_date": "2030-08",
      "has_results": false,
      "last_update_posted_date": "2026-08-28",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 15,
      "location_summary": "Greenbrae, California • Indianapolis, Indiana • Minneapolis, Minnesota + 12 more",
      "locations": [
        {
          "city": "Greenbrae",
          "state": "California"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        },
        {
          "city": "Providence",
          "state": "Rhode Island"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04486378"
    },
    {
      "nct_id": "NCT02485808",
      "title": "Symptoms of Lower Urinary Tract Dysfunction Phenotyping Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Lower Urinary Tract Symptoms"
      ],
      "interventions": [
        {
          "name": "None-observational",
          "type": "OTHER"
        },
        {
          "name": "Magnetic Resonance Imaging (MRI)",
          "type": "PROCEDURE"
        },
        {
          "name": "Multimodal Automated Sensory Testing System",
          "type": "OTHER"
        },
        {
          "name": "Auditory Sensitivity Test",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "Arbor Research Collaborative for Health",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1879,
      "start_date": "2015-04",
      "completion_date": "2018-05",
      "has_results": false,
      "last_update_posted_date": "2019-01-15",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 6,
      "location_summary": "Chicago, Illinois • Iowa City, Iowa • Ann Arbor, Michigan + 3 more",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        },
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02485808"
    },
    {
      "nct_id": "NCT07553234",
      "title": "Study to Understand Relationship Between Gut Health and Toxicities of Hormonal Breast Cancer Treatment",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Stool Sampling",
          "type": "OTHER"
        },
        {
          "name": "Chia Seeds",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 20,
      "start_date": "2026-12-27",
      "completion_date": "2030-05-03",
      "has_results": false,
      "last_update_posted_date": "2026-05-04",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07553234"
    },
    {
      "nct_id": "NCT03378336",
      "title": "Psoriatic Arthritis Research Collaborative: Biologic Sub-Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Psoriatic Arthritis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Pennsylvania",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "89 Years",
        "sex": "ALL",
        "summary": "18 Years to 89 Years"
      },
      "enrollment_count": 171,
      "start_date": "2017-12-31",
      "completion_date": "2023-08-16",
      "has_results": true,
      "last_update_posted_date": "2025-05-09",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 4,
      "location_summary": "New York, New York • Cleveland, Ohio • Philadelphia, Pennsylvania + 1 more",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Cleveland",
          "state": "Ohio"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Salt Lake City",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03378336"
    },
    {
      "nct_id": "NCT05084417",
      "title": "A Prospective, Observational Study of Clinician and Patient-reported Outcomes in Patients With Dermatological Conditions",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Atopic Dermatitis",
        "Dermatology",
        "Vitiligo",
        "Alopecia Areata",
        "Hidradenitis Suppurativa",
        "Psoriasis"
      ],
      "interventions": [
        {
          "name": "N/A This is an observational study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "OM1, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 10000,
      "start_date": "2023-06-09",
      "completion_date": "2026-01-15",
      "has_results": false,
      "last_update_posted_date": "2023-11-01",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05084417"
    },
    {
      "nct_id": "NCT04190888",
      "title": "Sickle Cell Uric Acid (SCUA) - Cohort Repository",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Chronic Kidney Diseases",
        "Sickle Cell Disease"
      ],
      "interventions": [
        {
          "name": "No intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Virginia Commonwealth University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "29 Years",
        "sex": "ALL",
        "summary": "5 Years to 29 Years"
      },
      "enrollment_count": 78,
      "start_date": "2019-07-01",
      "completion_date": "2021-12-31",
      "has_results": false,
      "last_update_posted_date": "2022-02-04",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 1,
      "location_summary": "Richmond, Virginia",
      "locations": [
        {
          "city": "Richmond",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04190888"
    },
    {
      "nct_id": "NCT05150184",
      "title": "Isolation and Characterization of Multiple Microbial Species From Diverse Healthy Adults",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Human Microbiome"
      ],
      "interventions": [
        {
          "name": "Non-interventional",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Danisco",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 52,
      "start_date": "2021-11-17",
      "completion_date": "2023-05-23",
      "has_results": false,
      "last_update_posted_date": "2023-09-07",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 1,
      "location_summary": "Beltsville, Maryland",
      "locations": [
        {
          "city": "Beltsville",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05150184"
    },
    {
      "nct_id": "NCT07017907",
      "title": "Evaluating an AI Tool for Detecting Thyrotoxic States",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Graves Disease",
        "Hyperthyroidism/Thyrotoxicosis"
      ],
      "interventions": [
        {
          "name": "Heart rate-based AI software for detecting thyrotoxicosis",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "THYROSCOPE INC.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "22 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "22 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2026-01-09",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-06-01",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07017907"
    },
    {
      "nct_id": "NCT04517838",
      "title": "Immune Response to Anti-HER2 Therapies in Patients With HER2-Positive Stage I-IV Breast Cancer",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Adenocarcinoma",
        "HER2-Positive Breast Carcinoma",
        "Anatomic Stage I Breast Cancer AJCC v8",
        "Anatomic Stage II Breast Cancer AJCC v8",
        "Anatomic Stage III Breast Cancer AJCC v8",
        "Anatomic Stage IV Breast Cancer AJCC v8"
      ],
      "interventions": [
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 230,
      "start_date": "2020-07-31",
      "completion_date": "2028-07-27",
      "has_results": false,
      "last_update_posted_date": "2026-06-16",
      "last_synced_at": "2026-09-26T11:55:55.306Z",
      "location_count": 1,
      "location_summary": "Jacksonville, Florida",
      "locations": [
        {
          "city": "Jacksonville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04517838"
    }
  ]
}