{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Biological+Markers&page=23",
    "query": {
      "condition": "Biological Markers",
      "page": 23
    },
    "page_size": 10
  },
  "pagination": {
    "page": 23,
    "page_size": 10,
    "total_count": 3308,
    "total_pages": 331,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Biological+Markers&page=24&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Biological+Markers&page=22&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-11-15T18:20:27.029Z",
  "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": "NCT02681120",
      "title": "Pilot Study of the Effect of Weight Loss on Breast Tissue and Blood Biomarkers in Women at Increased Risk for Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Neoplasms",
        "Obesity"
      ],
      "interventions": [
        {
          "name": "Biopsy",
          "type": "PROCEDURE"
        },
        {
          "name": "Blood draw",
          "type": "PROCEDURE"
        },
        {
          "name": "Mammogram",
          "type": "PROCEDURE"
        },
        {
          "name": "MRI",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Tarah J Ballinger, MD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 75 Years · Female only"
      },
      "enrollment_count": 3,
      "start_date": "2016-10-07",
      "completion_date": "2020-01-30",
      "has_results": false,
      "last_update_posted_date": "2021-10-14",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 3,
      "location_summary": "Carmel, Indiana • Indianapolis, Indiana",
      "locations": [
        {
          "city": "Carmel",
          "state": "Indiana"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02681120"
    },
    {
      "nct_id": "NCT06107842",
      "title": "Effect of Gerofit Exercise on Cognition in Older Veterans",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Aging",
        "Cognitive Impairment",
        "Physical Activity"
      ],
      "interventions": [
        {
          "name": "Gerofit exercise",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Health education",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 150,
      "start_date": "2024-04-01",
      "completion_date": "2029-03-31",
      "has_results": false,
      "last_update_posted_date": "2026-06-02",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 2,
      "location_summary": "West Los Angeles, California • Baltimore, Maryland",
      "locations": [
        {
          "city": "West Los Angeles",
          "state": "California"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06107842"
    },
    {
      "nct_id": "NCT07770880",
      "title": "Impact of Repeated Virtual Reality Training on Markers of Stress",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Stress",
        "Acute Stress Reaction",
        "Virtual Reality",
        "Active Shooter",
        "Law Enforcement Training"
      ],
      "interventions": [
        {
          "name": "Active Shooter",
          "type": "OTHER"
        },
        {
          "name": "Target Practice",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Texas State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "39 Years",
        "sex": "ALL",
        "summary": "18 Years to 39 Years"
      },
      "enrollment_count": 50,
      "start_date": "2025-10-01",
      "completion_date": "2026-05-01",
      "has_results": false,
      "last_update_posted_date": "2026-08-18",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 1,
      "location_summary": "San Marcos, Texas",
      "locations": [
        {
          "city": "San Marcos",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07770880"
    },
    {
      "nct_id": "NCT01671696",
      "title": "Defining Late Onset Occult Asymptomatic Cardiotoxicity in Childhood Cancer Survivors Exposed to Anthracycline Therapy",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cardiovascular Disease"
      ],
      "interventions": [
        {
          "name": "Cardiac MRI",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Connecticut Children's Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "9 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "9 Years to 35 Years"
      },
      "enrollment_count": 80,
      "start_date": "2011-11-15",
      "completion_date": "2017-10-06",
      "has_results": false,
      "last_update_posted_date": "2026-01-02",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 1,
      "location_summary": "Hartford, Connecticut",
      "locations": [
        {
          "city": "Hartford",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01671696"
    },
    {
      "nct_id": "NCT06796673",
      "title": "Retina BioBank: Retina Biomarkers for a Deeper Understanding of Vitreoretinal and Systemic Diseases",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Other Retinal Disorders",
        "Retinal Disease",
        "Retinal Vascular Disorder"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Greater Houston Retina Research",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 10000,
      "start_date": "2022-04-11",
      "completion_date": "2032-08",
      "has_results": false,
      "last_update_posted_date": "2025-01-28",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 3,
      "location_summary": "Bellaire, Texas • Katy, Texas • The Woodlands, Texas",
      "locations": [
        {
          "city": "Bellaire",
          "state": "Texas"
        },
        {
          "city": "Katy",
          "state": "Texas"
        },
        {
          "city": "The Woodlands",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06796673"
    },
    {
      "nct_id": "NCT04937959",
      "title": "Amyloid Prediction in Early Stage Alzheimer's Disease Through Speech Phenotyping - PAST Extension",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Alzheimer Disease",
        "Alzheimer's Disease (Incl Subtypes)",
        "Preclinical Alzheimer's Disease",
        "Prodromal Alzheimer's Disease",
        "Mild Cognitive Impairment",
        "Normal Cognition"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Novoic Limited",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "50 Years to 85 Years"
      },
      "enrollment_count": 40,
      "start_date": "2021-01-22",
      "completion_date": "2022-08-30",
      "has_results": false,
      "last_update_posted_date": "2022-04-07",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 1,
      "location_summary": "Santa Ana, California",
      "locations": [
        {
          "city": "Santa Ana",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04937959"
    },
    {
      "nct_id": "NCT04107779",
      "title": "Changes in Biomarkers of Cigarette Smoke Exposure After Switching Either Exclusively or Partly to JUUL ENDS",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Electronic Cigarette Use",
        "Cigarette Use, Electronic",
        "Tobacco Use",
        "Tobacco Smoking"
      ],
      "interventions": [
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 5% Virginia Tobacco ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 3% Virginia Tobacco ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 5% Mint ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 3% Mint ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 5% Menthol ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 3% Menthol ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 5% Mango ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch from UB of Combustible Cigarette to JUUL 3% Mango ENDS",
          "type": "OTHER"
        },
        {
          "name": "Switch to Dual-use of JUUL 5% and UB of Combustible Cigarette",
          "type": "OTHER"
        },
        {
          "name": "Tobacco/Nicotine Abstention",
          "type": "OTHER"
        },
        {
          "name": "Usual Brand of cigarettes",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Juul Labs, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "21 Years to 65 Years"
      },
      "enrollment_count": 279,
      "start_date": "2019-09-17",
      "completion_date": "2020-06-24",
      "has_results": false,
      "last_update_posted_date": "2020-07-28",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 5,
      "location_summary": "Little Rock, Arkansas • Rogers, Arkansas • St Louis, Missouri + 2 more",
      "locations": [
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Rogers",
          "state": "Arkansas"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Dayton",
          "state": "Ohio"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04107779"
    },
    {
      "nct_id": "NCT01295346",
      "title": "Biomarkers of Mild and Moderate Traumatic Brain Injury",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Brain Injuries, Traumatic"
      ],
      "interventions": [
        {
          "name": "Head CT scan and blood draw",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Banyan Biomarkers, Inc",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "18 Years to 80 Years"
      },
      "enrollment_count": 290,
      "start_date": "2011-01",
      "completion_date": "2012-03",
      "has_results": false,
      "last_update_posted_date": "2017-08-08",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 5,
      "location_summary": "Gainesville, Florida • Decatur, Georgia • Lawrenceville, Georgia + 2 more",
      "locations": [
        {
          "city": "Gainesville",
          "state": "Florida"
        },
        {
          "city": "Decatur",
          "state": "Georgia"
        },
        {
          "city": "Lawrenceville",
          "state": "Georgia"
        },
        {
          "city": "Detroit",
          "state": "Michigan"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01295346"
    },
    {
      "nct_id": "NCT02385786",
      "title": "Mindfulness-Based Cognitive Therapy Effect on Depression and C-Reactive Protein Levels After 8 Weeks of Treatment",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Major Depressive Disorder"
      ],
      "interventions": [
        {
          "name": "Mindfulness-Based Cognitive Therapy",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 43,
      "start_date": "2011-11",
      "completion_date": "2012-08",
      "has_results": false,
      "last_update_posted_date": "2022-03-22",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02385786"
    },
    {
      "nct_id": "NCT00805688",
      "title": "Identifying the Role of Symptom Outcomes and Biomarkers in Survival in Patients With Metastatic Pancreatic Cancer",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Pancreatic Cancer"
      ],
      "interventions": [
        {
          "name": "Questionnaires",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Blood Draws",
          "type": "PROCEDURE"
        },
        {
          "name": "Pedometer",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL",
        "PROCEDURE",
        "DEVICE"
      ],
      "sponsor": "M.D. Anderson 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": 100,
      "start_date": "2008-11-12",
      "completion_date": "2018-02-27",
      "has_results": false,
      "last_update_posted_date": "2018-03-06",
      "last_synced_at": "2026-11-15T18:20:27.029Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00805688"
    }
  ]
}