{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=letrozole+2.5+mg&page=6",
    "query": {
      "intervention": "letrozole 2.5 mg",
      "page": 6
    },
    "page_size": 10
  },
  "pagination": {
    "page": 6,
    "page_size": 10,
    "total_count": 133,
    "total_pages": 14,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=letrozole+2.5+mg&page=7&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=letrozole+2.5+mg&page=5&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-12T15:39:41.789Z",
  "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": "NCT00651976",
      "title": "Letrozole in Treating Postmenopausal Women With Stage I, II or III Breast Cancer That Can Be Removed by Surgery",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "letrozole",
          "type": "DRUG"
        },
        {
          "name": "Blood Collection",
          "type": "OTHER"
        },
        {
          "name": "biopsy/lumpectomy/mastectomy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "Vanderbilt-Ingram Cancer Center",
      "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": 213,
      "start_date": "2008-03",
      "completion_date": "2018-09",
      "has_results": false,
      "last_update_posted_date": "2018-10-15",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 5,
      "location_summary": "Atlanta, Georgia • Tulsa, Oklahoma • Pittsburgh, Pennsylvania + 1 more",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Tulsa",
          "state": "Oklahoma"
        },
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00651976"
    },
    {
      "nct_id": "NCT01484041",
      "title": "Dovitinib Plus an Aromatase Inhibitor for Metastatic Breast Cancer",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Dovitinib",
          "type": "DRUG"
        },
        {
          "name": "Aromatase Inhibitors",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Georgetown University",
      "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": 12,
      "start_date": "2012-04",
      "completion_date": "2017-12",
      "has_results": true,
      "last_update_posted_date": "2018-02-09",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 1,
      "location_summary": "Washington D.C., District of Columbia",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01484041"
    },
    {
      "nct_id": "NCT06953882",
      "title": "Impact of Omitting Chemo Based on Patient's Selection for ER-Positive, HER2-Negative Breast Cancer With Ribociclib and Endocrine Therapy",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "HER2 Negative Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Ribociclib 400mg",
          "type": "DRUG"
        },
        {
          "name": "Letrozole 2.5mg",
          "type": "DRUG"
        },
        {
          "name": "Anastrazole 1mg",
          "type": "DRUG"
        },
        {
          "name": "Goserelin 3.6 MG",
          "type": "DRUG"
        },
        {
          "name": "Adjuvant chemotherapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "DRUG",
        "RADIATION"
      ],
      "sponsor": "Yale University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 140,
      "start_date": "2025-07-09",
      "completion_date": "2030-09",
      "has_results": false,
      "last_update_posted_date": "2026-05-26",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06953882"
    },
    {
      "nct_id": "NCT00634634",
      "title": "Phase I/II Trial of Letrozole and Sorafenib in Post-Menopausal Hormone-Receptor + Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Metastatic Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Sorafenib",
          "type": "DRUG"
        },
        {
          "name": "Letrozole",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Rutgers, The State University of New Jersey",
      "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": 52,
      "start_date": "2008-08-11",
      "completion_date": "2023-04-28",
      "has_results": true,
      "last_update_posted_date": "2023-11-09",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 4,
      "location_summary": "Washington D.C., District of Columbia • Atlanta, Georgia • New Brunswick, New Jersey + 1 more",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "New Brunswick",
          "state": "New Jersey"
        },
        {
          "city": "Voorhees Township",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00634634"
    },
    {
      "nct_id": "NCT04657679",
      "title": "Pharmacokinetics and Pharmacogenomics of Ribociclib in Race-based Cohorts",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Ribociclib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Georgetown University",
      "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": 21,
      "start_date": "2021-05-20",
      "completion_date": "2023-10-30",
      "has_results": true,
      "last_update_posted_date": "2024-11-26",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 3,
      "location_summary": "Washington D.C., District of Columbia • Boston, Massachusetts",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04657679"
    },
    {
      "nct_id": "NCT01042379",
      "title": "I-SPY TRIAL: Neoadjuvant and Personalized Adaptive Novel Agents to Treat Breast Cancer",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Breast Neoplasms",
        "Breast Cancer",
        "Breast Tumors",
        "Angiosarcoma",
        "TNBC - Triple-Negative Breast Cancer",
        "HER2-positive Breast Cancer",
        "HER2-negative Breast Cancer",
        "Hormone Receptor Positive Tumor",
        "Hormone Receptor Negative Tumor",
        "Early-stage Breast Cancer",
        "Locally Advanced Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Standard Therapy",
          "type": "DRUG"
        },
        {
          "name": "AMG 386 with or without Trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "AMG 479 (Ganitumab) plus Metformin",
          "type": "DRUG"
        },
        {
          "name": "MK-2206 with or without Trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "AMG 386 and Trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "T-DM1 and Pertuzumab",
          "type": "DRUG"
        },
        {
          "name": "Pertuzumab and Trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "Ganetespib",
          "type": "DRUG"
        },
        {
          "name": "ABT-888",
          "type": "DRUG"
        },
        {
          "name": "Neratinib",
          "type": "DRUG"
        },
        {
          "name": "PLX3397",
          "type": "DRUG"
        },
        {
          "name": "Pembrolizumab - 4 cycle",
          "type": "DRUG"
        },
        {
          "name": "Talazoparib plus Irinotecan",
          "type": "DRUG"
        },
        {
          "name": "Patritumab and Trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "Pembrolizumab - 8 cycle",
          "type": "DRUG"
        },
        {
          "name": "SGN-LIV1A",
          "type": "DRUG"
        },
        {
          "name": "Durvalumab plus Olaparib",
          "type": "DRUG"
        },
        {
          "name": "SD-101 + Pembrolizumab",
          "type": "DRUG"
        },
        {
          "name": "Tucatinib plus trastuzumab and pertuzumab",
          "type": "DRUG"
        },
        {
          "name": "Cemiplimab",
          "type": "DRUG"
        },
        {
          "name": "Cemiplimab plus REGN3767",
          "type": "DRUG"
        },
        {
          "name": "Trilaciclib with or without trastuzumab + pertuzumab",
          "type": "DRUG"
        },
        {
          "name": "SYD985 ([vic-]trastuzumab duocarmazine)",
          "type": "DRUG"
        },
        {
          "name": "Oral Paclitaxel + Encequidar + Dostarlimab (TSR-042) + Carboplatin with or without trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "Oral Paclitaxel + Encequidar + Dostarlimab (TSR-042) with or without trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "Amcenestrant",
          "type": "DRUG"
        },
        {
          "name": "Amcenestrant + Abemaciclib",
          "type": "DRUG"
        },
        {
          "name": "Amcenestrant + Letrozole",
          "type": "DRUG"
        },
        {
          "name": "ARX788",
          "type": "DRUG"
        },
        {
          "name": "ARX788 + Cemiplimab",
          "type": "DRUG"
        },
        {
          "name": "VV1 + Cemiplimab",
          "type": "DRUG"
        },
        {
          "name": "Datopotamab deruxtecan",
          "type": "DRUG"
        },
        {
          "name": "Datopotamab deruxtecan + Durvalumab",
          "type": "DRUG"
        },
        {
          "name": "Zanidatamab",
          "type": "DRUG"
        },
        {
          "name": "Lasofoxifene",
          "type": "DRUG"
        },
        {
          "name": "Z-endoxifen",
          "type": "DRUG"
        },
        {
          "name": "ARV-471",
          "type": "DRUG"
        },
        {
          "name": "ARV-471 + Letrozole",
          "type": "DRUG"
        },
        {
          "name": "ARV-471 + Abemaciclib",
          "type": "DRUG"
        },
        {
          "name": "Endoxifen + Abemaciclib",
          "type": "DRUG"
        },
        {
          "name": "Rilvegostomig + TDXd",
          "type": "DRUG"
        },
        {
          "name": "Dan222 + Niraparib",
          "type": "DRUG"
        },
        {
          "name": "Sarilumab + Cemiplimab + Paclitaxel",
          "type": "DRUG"
        },
        {
          "name": "GSK 5733584",
          "type": "DRUG"
        },
        {
          "name": "GSK 5733584 + Dostarlimab",
          "type": "DRUG"
        },
        {
          "name": "Ivonescimab (20mg/kg Q3W)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "QuantumLeap Healthcare Collaborative",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 5000,
      "start_date": "2010-03-01",
      "completion_date": "2031-12",
      "has_results": false,
      "last_update_posted_date": "2026-05-06",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 42,
      "location_summary": "Birmingham, Alabama • Scottsdale, Arizona • Tucson, Arizona + 36 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Davis",
          "state": "California"
        },
        {
          "city": "Duarte",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01042379"
    },
    {
      "nct_id": "NCT02296801",
      "title": "A Phase II Randomized Study Evaluating the Biological and Clinical Effects of the Combination of Palbociclib With Letrozole as Neoadjuvant Therapy in Post-Menopausal Women With Estrogen-Receptor Positive Primary Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Breast Cancer",
        "Breast Carcinoma",
        "Breast Tumors"
      ],
      "interventions": [
        {
          "name": "Letrozole",
          "type": "DRUG"
        },
        {
          "name": "palbociclib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "NSABP Foundation Inc",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 307,
      "start_date": "2015-01",
      "completion_date": "2019-03",
      "has_results": true,
      "last_update_posted_date": "2022-01-13",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 19,
      "location_summary": "Long Beach, California • Miami, Florida • Decatur, Illinois + 13 more",
      "locations": [
        {
          "city": "Long Beach",
          "state": "California"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Decatur",
          "state": "Illinois"
        },
        {
          "city": "Louisville",
          "state": "Kentucky"
        },
        {
          "city": "Louisville",
          "state": "Kentucky"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02296801"
    },
    {
      "nct_id": "NCT00014638",
      "title": "Letrozole in Treating Postmenopausal Women With Metastatic Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "letrozole",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": null,
      "start_date": "2001-01",
      "completion_date": "2002-03",
      "has_results": false,
      "last_update_posted_date": "2013-02-21",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 20,
      "location_summary": "Berkeley, California • Long Beach, California • Hollywood, Florida + 17 more",
      "locations": [
        {
          "city": "Berkeley",
          "state": "California"
        },
        {
          "city": "Long Beach",
          "state": "California"
        },
        {
          "city": "Hollywood",
          "state": "Florida"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Pinecrest",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00014638"
    },
    {
      "nct_id": "NCT02692755",
      "title": "Palbociclib / Letrozole or Fulvestrant in African American Women With HR+ HER2- Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Hormone Receptor Positive HER-2 Negative Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Palbociclib + Letrozole or Fulvestrant",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Georgetown University",
      "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": 35,
      "start_date": "2016-09",
      "completion_date": "2021-03-23",
      "has_results": true,
      "last_update_posted_date": "2021-09-28",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 6,
      "location_summary": "Washington D.C., District of Columbia • Chicago, Illinois • Baltimore, Maryland + 1 more",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02692755"
    },
    {
      "nct_id": "NCT00579826",
      "title": "Study of Breast Cancer Prevention by Letrozole in High Risk Women",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Letrozole",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Carol Fabian, MD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "69 Years",
        "sex": "FEMALE",
        "summary": "30 Years to 69 Years · Female only"
      },
      "enrollment_count": 55,
      "start_date": "2006-10",
      "completion_date": "2018-08",
      "has_results": true,
      "last_update_posted_date": "2023-06-12",
      "last_synced_at": "2026-10-12T15:39:41.789Z",
      "location_count": 1,
      "location_summary": "Kansas City, Kansas",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Kansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00579826"
    }
  ]
}