{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letters&page=6",
    "query": {
      "intervention": "Letters",
      "page": 6
    },
    "page_size": 10
  },
  "pagination": {
    "page": 6,
    "page_size": 10,
    "total_count": 157,
    "total_pages": 16,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letters&page=7&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letters&page=5&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-26T09:09:03.487Z",
  "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": "NCT02184637",
      "title": "A Study to Evaluate the Pharmacokinetics of a Single Dose of Tafenoquine Co-administered With Either Artemether + Lumefantrine or Dihydroartemisinin + Piperaquine Tetraphosphate",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Malaria, Vivax"
      ],
      "interventions": [
        {
          "name": "Tafenoquine",
          "type": "DRUG"
        },
        {
          "name": "Dihydroartemisinin + Piperaquine tetraphosphate",
          "type": "DRUG"
        },
        {
          "name": "Artemether + Lumefantrine",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 120,
      "start_date": "2014-07-31",
      "completion_date": "2015-04-08",
      "has_results": false,
      "last_update_posted_date": "2017-07-13",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02184637"
    },
    {
      "nct_id": "NCT03856593",
      "title": "Encouraging Judicious Prescribing of Opioids in Los Angeles County",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Substance-Related Disorders"
      ],
      "interventions": [
        {
          "name": "Standard letter",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Comparator letter",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Southern California",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 541,
      "start_date": "2019-04-05",
      "completion_date": "2021-08-08",
      "has_results": true,
      "last_update_posted_date": "2023-03-28",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03856593"
    },
    {
      "nct_id": "NCT06239896",
      "title": "Advance Care Planning With Formerly Homeless Older Adults Residing in Permanent Supportive Housing",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Advance Care Planning"
      ],
      "interventions": [
        {
          "name": "Facilitated Group ACP Session",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Facilitated one-on-one ACP visits",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 650,
      "start_date": "2024-03-06",
      "completion_date": "2027-03",
      "has_results": false,
      "last_update_posted_date": "2025-11-20",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 6,
      "location_summary": "Fremont, California • Oakland, California • San Francisco, California",
      "locations": [
        {
          "city": "Fremont",
          "state": "California"
        },
        {
          "city": "Oakland",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06239896"
    },
    {
      "nct_id": "NCT02675270",
      "title": "Rehabilitation and Prophylaxis of Anomia in Primary Progressive Aphasia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Aphasia, Primary Progressive",
        "Anomia",
        "Alzheimer Disease"
      ],
      "interventions": [
        {
          "name": "Phonological",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Orthographic",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Semantic",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Lexical",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Untrained",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Georgetown University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "40 Years and older"
      },
      "enrollment_count": 84,
      "start_date": "2011-11",
      "completion_date": "2024-06-30",
      "has_results": false,
      "last_update_posted_date": "2024-09-25",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "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/NCT02675270"
    },
    {
      "nct_id": "NCT00693303",
      "title": "Examining the Effectiveness of My Scrivener on Handwriting Legibility",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy Children"
      ],
      "interventions": [
        {
          "name": "Handwriting Training using My Scrivener",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Shenandoah University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "13 Years",
        "sex": "ALL",
        "summary": "5 Years to 13 Years"
      },
      "enrollment_count": 21,
      "start_date": "2008-06",
      "completion_date": "2008-08",
      "has_results": true,
      "last_update_posted_date": "2017-12-15",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 1,
      "location_summary": "Winchester, Virginia",
      "locations": [
        {
          "city": "Winchester",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00693303"
    },
    {
      "nct_id": "NCT05724615",
      "title": "Default Bulk Ordering and Text Messaging to Enhance Outreach for Lipid Screening (Missing Lipids)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Atherosclerotic Cardiovascular Disease"
      ],
      "interventions": [
        {
          "name": "Outreach + Bulk ordering",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Outreach + Bulk ordering + Text Based Reminders and Scheduling assistance",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Pennsylvania",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "20 Years to 75 Years"
      },
      "enrollment_count": 1000,
      "start_date": "2023-06-05",
      "completion_date": "2023-12-07",
      "has_results": false,
      "last_update_posted_date": "2024-01-05",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05724615"
    },
    {
      "nct_id": "NCT01172080",
      "title": "Utility Analysis of an Endoscopy Follow-up System",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colonoscopy Adherence"
      ],
      "interventions": [
        {
          "name": "protocol of reminders regarding due colonoscopy",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Beth Israel Deaconess Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "Up to 85 Years"
      },
      "enrollment_count": 830,
      "start_date": "2009-01",
      "completion_date": "2011-10",
      "has_results": false,
      "last_update_posted_date": "2018-03-19",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01172080"
    },
    {
      "nct_id": "NCT04926129",
      "title": "Natural History of the Progression of X-Linked Retinitis Pigmentosa",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "X-Linked Retinitis Pigmentosa"
      ],
      "interventions": [
        {
          "name": "Other: Assessments",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "NightstaRx Ltd, a Biogen Company",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "7 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "7 Years and older"
      },
      "enrollment_count": 201,
      "start_date": "2017-09-13",
      "completion_date": "2022-12-16",
      "has_results": false,
      "last_update_posted_date": "2023-02-10",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 10,
      "location_summary": "Phoenix, Arizona • Los Angeles, California • San Francisco, California + 7 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04926129"
    },
    {
      "nct_id": "NCT03181334",
      "title": "The C-SPAN Coalition: Colorectal Cancer Screening and Patient Navigation",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer"
      ],
      "interventions": [
        {
          "name": "Branch I",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Branch II",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Branch III",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Branch IV",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Branch V",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "74 Years",
        "sex": "ALL",
        "summary": "50 Years to 74 Years"
      },
      "enrollment_count": 7711,
      "start_date": "2017-09-05",
      "completion_date": "2020-12-31",
      "has_results": false,
      "last_update_posted_date": "2021-04-28",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 2,
      "location_summary": "Fort Worth, Texas",
      "locations": [
        {
          "city": "Fort Worth",
          "state": "Texas"
        },
        {
          "city": "Fort Worth",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03181334"
    },
    {
      "nct_id": "NCT07511621",
      "title": "A Multi-Level Strategy for De-implementing Mammography Overuse Among Older Women",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Mammography",
        "Medical Overuse",
        "Evidence-based Practice",
        "Older Adults"
      ],
      "interventions": [
        {
          "name": "Enhanced Usual Care (EUC)",
          "type": "OTHER"
        },
        {
          "name": "Multilevel De-Implementation Strategy",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "OTHER",
        "BEHAVIORAL"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 500,
      "start_date": "2026-03-11",
      "completion_date": "2028-03",
      "has_results": false,
      "last_update_posted_date": "2026-09-25",
      "last_synced_at": "2026-10-26T09:09:03.487Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07511621"
    }
  ]
}