{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+%2B+Phone+Call+Intervention%3A",
    "query": {
      "intervention": "Letter + Phone Call Intervention:"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 43,
    "total_pages": 5,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+%2B+Phone+Call+Intervention%3A&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-10-09T12:54:22.712Z",
  "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": "NCT02360605",
      "title": "Health Literacy Interventions to Overcome Disparities in CRC Screening",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer"
      ],
      "interventions": [
        {
          "name": "automated telephone reminder",
          "type": "BEHAVIORAL"
        },
        {
          "name": "prevention coordinator",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Health literacy appropriate education and demonstration",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Louisiana State University Health Sciences Center Shreveport",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "50 Years to 75 Years"
      },
      "enrollment_count": 620,
      "start_date": "2015-02",
      "completion_date": "2018-11-06",
      "has_results": true,
      "last_update_posted_date": "2021-06-30",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Shreveport, Louisiana",
      "locations": [
        {
          "city": "Shreveport",
          "state": "Louisiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02360605"
    },
    {
      "nct_id": "NCT03414125",
      "title": "Effect of Mailed Invites of Choice of Colonoscopy or FIT vs. Mailed FIT Alone on Colorectal Cancer Screening",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer"
      ],
      "interventions": [
        {
          "name": "FIT Screening Strategy",
          "type": "OTHER"
        },
        {
          "name": "Choice Screening Strategy",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "63 Years",
        "sex": "ALL",
        "summary": "50 Years to 63 Years"
      },
      "enrollment_count": 26859,
      "start_date": "2018-09-07",
      "completion_date": "2021-08-31",
      "has_results": false,
      "last_update_posted_date": "2021-09-13",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03414125"
    },
    {
      "nct_id": "NCT06543394",
      "title": "Engaging Patients in Adherence Interventions Using Behavioral Science",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Uncontrolled Hypertension"
      ],
      "interventions": [
        {
          "name": "Primer postcard",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Control recruitment letter",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Behavioral theory-informed recruitment letter",
          "type": "BEHAVIORAL"
        },
        {
          "name": "2 phone calls",
          "type": "BEHAVIORAL"
        },
        {
          "name": "4 phone calls",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 584,
      "start_date": "2024-11-08",
      "completion_date": "2027-09-30",
      "has_results": false,
      "last_update_posted_date": "2025-12-09",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06543394"
    },
    {
      "nct_id": "NCT01827215",
      "title": "Randomized Control Trial of a Virtual Patient Advocate for Preconception Care",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Preconception Care"
      ],
      "interventions": [
        {
          "name": "Virtual Patient Advocate (VPA)",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Boston Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "34 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 34 Years · Female only"
      },
      "enrollment_count": 528,
      "start_date": "2013-09",
      "completion_date": "2019-01",
      "has_results": false,
      "last_update_posted_date": "2019-10-03",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01827215"
    },
    {
      "nct_id": "NCT03929926",
      "title": "Proactive Outreach and Shared Decision Making in Improving Lung Cancer Screening Rates in Primary Care Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Lung Cancer"
      ],
      "interventions": [
        {
          "name": "Best Practice",
          "type": "OTHER"
        },
        {
          "name": "Cancer Educational Materials",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Behavioral, Psychological or Informational Intervention",
          "type": "OTHER"
        },
        {
          "name": "Counseling",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "BEHAVIORAL"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "55 Years to 80 Years"
      },
      "enrollment_count": 2355,
      "start_date": "2019-06-19",
      "completion_date": "2024-05-01",
      "has_results": false,
      "last_update_posted_date": "2025-05-20",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03929926"
    },
    {
      "nct_id": "NCT06569290",
      "title": "Refinement and Testing of Recruitment Methodology for Behavioral Medication Adherence Interventions Using Behavioral Science-based Approaches",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Diabetes",
        "Pharmacist-Patient Relations",
        "Medication Adherence"
      ],
      "interventions": [
        {
          "name": "Primer postcard",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Control recruitment letter",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Behavioral theory-informed recruitment letter (prospect theory)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "2 phone calls",
          "type": "BEHAVIORAL"
        },
        {
          "name": "4 phone calls",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 590,
      "start_date": "2025-03-03",
      "completion_date": "2026-06-15",
      "has_results": false,
      "last_update_posted_date": "2026-07-07",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06569290"
    },
    {
      "nct_id": "NCT03147547",
      "title": "Parent Engagement Package: Initial Testing of Strategies to Increase Participation in Parenting Interventions",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Patient Compliance"
      ],
      "interventions": [
        {
          "name": "Promotional Brochure",
          "type": "OTHER"
        },
        {
          "name": "Family Testimonial Flyer",
          "type": "OTHER"
        },
        {
          "name": "Teacher Endorsement",
          "type": "OTHER"
        },
        {
          "name": "Provider Engagement Call",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Arizona State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 122,
      "start_date": "2009-01",
      "completion_date": "2010-05",
      "has_results": false,
      "last_update_posted_date": "2017-05-10",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Tempe, Arizona",
      "locations": [
        {
          "city": "Tempe",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03147547"
    },
    {
      "nct_id": "NCT04683510",
      "title": "Awareness Enhancing Interventions",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Research Awareness"
      ],
      "interventions": [
        {
          "name": "Navigation - Study Specific - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Navigation - Study Specific - Cancer Survivor Voice",
          "type": "OTHER"
        },
        {
          "name": "Navigation - Research General - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Navigation - Research General - Cancer Survivor Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Study Specific - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Study Specific - Cancer Survivor Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Research General - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Research General - Cancer Survivor Voice",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Tennessee",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 4451,
      "start_date": "2021-04-12",
      "completion_date": "2025-03-31",
      "has_results": true,
      "last_update_posted_date": "2025-05-04",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 2,
      "location_summary": "Birmingham, Alabama • Memphis, Tennessee",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Memphis",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04683510"
    },
    {
      "nct_id": "NCT01332032",
      "title": "Promoting Breast Cancer Screening in Non-adherent Women",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Reminder Letter",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Reminder Call",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Counselor Call",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Massachusetts, Worcester",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "84 Years",
        "sex": "FEMALE",
        "summary": "40 Years to 84 Years · Female only"
      },
      "enrollment_count": 36348,
      "start_date": "2009-07",
      "completion_date": "2015-05",
      "has_results": false,
      "last_update_posted_date": "2015-06-01",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Worcester, Massachusetts",
      "locations": [
        {
          "city": "Worcester",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01332032"
    },
    {
      "nct_id": "NCT06872346",
      "title": "Personalized Risk-based Follow-up of Cervical Cancer Screening in Practice, RCT",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cervical Cancer Screening"
      ],
      "interventions": [
        {
          "name": "Visit-based IT reminders to patients and practitioners",
          "type": "OTHER"
        },
        {
          "name": "Population outreach",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "70 Years",
        "sex": "FEMALE",
        "summary": "21 Years to 70 Years · Female only"
      },
      "enrollment_count": 7500,
      "start_date": "2026-07-22",
      "completion_date": "2029-01-22",
      "has_results": false,
      "last_update_posted_date": "2026-08-07",
      "last_synced_at": "2026-10-09T12:54:22.712Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06872346"
    }
  ]
}