Clinical Trials Using Letrozole

Clinical trials are research studies that involve people. The clinical trials on this list are studying Letrozole. All trials on the list are supported by NCI.

NCI’s basic information about clinical trials explains the types and phases of trials and how they are carried out. Clinical trials look at new ways to prevent, detect, or treat disease. You may want to think about taking part in a clinical trial. Talk to your doctor for help in deciding if one is right for you.

Trials 1-25 of 39
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  • Letrozole with or without Paclitaxel and Carboplatin in Treating Patients with Stage II-IV Ovarian, Fallopian Tube, or Primary Peritoneal Cancer

    This phase III trial studies how well letrozole with or without paclitaxel and carboplatin works in treating patients with stage II-IV low-grade serous carcinoma of the ovary, fallopian tube, or peritoneum. Letrozole is an enzyme inhibitor that lowers the amount of estrogen made by the body which in turn may stop the growth of tumor cells that need estrogen to grow. Drugs used in chemotherapy, such as paclitaxel and carboplatin, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. It is not yet known whether giving letrozole alone or in combination with paclitaxel and carboplatin works better in treating patients with low-grade serous carcinoma of the ovary, fallopian tube, or peritoneum compared to paclitaxel and carboplatin without letrozole.
    Location: 604 locations

  • Randomized, Open Label, Clinical Study of the Targeted Therapy, Palbociclib, to Treat Metastatic Breast Cancer

    The primary objective of this study is to demonstrate that the combination of palbociclib with anti-HER2 therapy plus endocrine therapy is superior to anti-HER2-based therapy plus endocrine therapy alone in improving the outcomes of subjects with hormone receptor-positive, HER2+ metastatic breast cancer.
    Location: 26 locations

  • Fulvestrant or Exemestane with or without Ribociclib in Patients with Recurrent, Unresectable, or Metastatic Hormone Receptor Positive, HER2 Negative Breast Cancer

    This randomized, phase II trial studies how well fulvestrant or exemestane with or without ribociclib works in treating patients with hormone receptor positive, human epidermal growth factor receptor 2 (HER2) negative breast cancer that has progressed after treatment with an aromatase inhibitor or cyclin-dependent kinase 4 / 6 inhibitor (recurrent), cannot be removed by surgery (unresectable), or has spread to other parts of the body (metastatic). Hormone therapy using fulvestrant or exemestane may fight breast cancer by blocking the use of estrogen by the tumor cells or reducing the amount of estrogen made by the body. Ribociclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Giving fulvestrant or exemestane with ribociclib may be an effective treatment for patients with breast cancer.
    Location: 16 locations

  • Radiation Therapy, Palbociclib, and Hormone Therapy in Treating Breast Cancer Patients with Bone Metastasis

    This phase II trial studies how well radiation therapy given with standard care palbociclib and hormone therapy work in treating patients with breast cancer that has spread from one part of the body to the bone (bone metastasis). Radiation therapy uses high energy x-rays to kill tumor cells and shrink tumors. Palbociclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Estrogen can cause the growth of breast cancer cells. Letrozole, anastrozole, and exemestane lowers the amount of estrogen made by the body. This may help stop the growth of tumor cells that need estrogen to grow. Fulvestrant and tamoxifen blocks the use of estrogen by the tumor cells. Giving radiation therapy, palbociclib, and hormone therapy may work better in treating breast cancer patients with bone metastasis.
    Location: 11 locations

  • A Study of LY3484356 in Participants With Advanced or Metastatic Breast Cancer or Endometrial Cancer

    The reason for this study is to see if the study drug LY3484356 alone or in combination with other anticancer therapies is safe and effective in participants with advanced or metastatic breast cancer or endometrial cancer.
    Location: 13 locations

  • Ribociclib and Letrozole Treatment in Ovarian Cancer

    The study evaluates the response to treatment with Ribociclib and Letrozole in patients with low grade serous cancer of the ovary, fallopian tube or peritoneum.
    Location: 10 locations

  • A Study Evaluating the Efficacy and Safety of Giredestrant Combined With Palbociclib Compared With Letrozole Combined With Palbociclib in Participants With Estrogen Receptor-Positive, HER2-Negative Locally Advanced or Metastatic Breast Cancer (persevERA Breast Cancer)

    This Phase III, randomized, double-blind, placebo-controlled, multicenter study will evaluate the efficacy and safety of giredestrant combined with palbociclib compared with letrozole combined with palbociclib in patients with estrogen receptor (ER)-positive, human epidermal growth factor receptor-2 (HER2)-negative locally advanced (recurrent or progressed) or metastatic breast cancer.
    Location: 10 locations

  • Pembrolizumab, Endocrine Therapy, and Palbociclib in Treating Postmenopausal Patients with Newly Diagnosed Metastatic Stage IV Estrogen Receptor Positive Breast Cancer

    This phase II trial studies how well pembrolizumab works when given together with endocrine therapy and palbociclib in treating postmenopausal patients with newly diagnosed stage IV estrogen receptor positive breast cancer that has spread to other parts of the body (metastatic). Immunotherapy with monoclonal antibodies, such as pembrolizumab, may help the body’s immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Estrogen can cause the growth of breast cancer cells. Antihormone therapy, such as letrozole and fulvestrant, may lessen the amount of estrogen made by the body. Palbociclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Giving pembrolizumab, palbociclib, and letrozole or fulvestrant may be an effective treatment for patients with stage IV estrogen receptor positive breast cancer.
    Location: 7 locations

  • Amcenestrant (SAR439859) Plus Palbociclib as First Line Therapy for Patients With ER (+) HER2(-) Advanced Breast Cancer

    Primary Objective: To determine whether Amcenestrant (SAR439859) in combination with palbociclib improvesprogression free survival (PFS) when compared with letrozole in combination with palbociclib in participants with ER+, HER2- advanced breast cancer who have not received any prior systemic anticancer therapies for advanced disease. Secondary Objective: - To compare the overall survival in both treatment arms - To evaluate the objective response rate in both treatment arms - To evaluate the duration of response in both treatment arms - To evaluate the clinical benefit rate in both treatment arms - To evaluate progression-free survival on next line of therapy - To evaluate the pharmacokinetics of amcenestrant, and palbociclib - To evaluate health-related quality of life in both treatment arms - To evaluate the time to first chemotherapy in both treatment arms - To evaluate safety in both treatment arms
    Location: 10 locations

  • Phase 2 Study of Amcenestrant (SAR439859) Versus Physician's Choice in Locally Advanced or Metastatic ER-positive Breast Cancer

    Primary Objective: To determine whether amcenestrant per os improves progression free survival (PFS) when compared with a endocrine monotherapy of the choice of the physician, in participants with metastatic or locally advanced breast cancer Secondary Objectives: - To compare the overall survival in the 2 treatment arms - To assess the objective response rate in the 2 treatment arms - To evaluate the disease control rate in the 2 treatment arms - To evaluate the clinical benefit rate in the 2 treatment arms - To evaluate the duration of response in the 2 treatment arms - To evaluate the PFS according to the estrogen receptor 1 gene (ESR1) mutation status in the 2 treatment arms - To evaluate the pharmacokinetics of amcenestrant as single agent - To evaluate health related quality of life in the 2 treatment arms - To compare the overall safety profile in the 2 treatment arms
    Location: 6 locations

  • Abemaciclib and Letrozole to Treat Endometrial Cancer

    This is a phase II single arm trial to evaluate the objective response rate of abemaciclib and letrozole in advanced stage, persistent or recurrent endometrioid endometrial cancer. Treatment will continue until either unacceptable toxicity, progression of disease, or investigator / patient request for withdrawal.
    Location: 6 locations

  • Docetaxel and Trastuzumab before Surgery for the Treatment of HER2-Positive Stage II-III Breast Cancer in Nigerian Women, the ARETTA Trial

    This phase II trial studies the effect of docetaxel and trastuzumab before surgery in treating HER2 positive stage II-III breast cancer in Nigerian women. Chemotherapy drugs, such as docetaxel, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Trastuzumab is a form of targeted therapy because it attaches itself to specific molecules (receptors) on the surface of cancer cells, known as HER2 receptors. When trastuzumab attaches to HER2 receptors, the signals that tell the cells to grow are blocked and the cancer cell may be marked for destruction by the body's immune system. This study is being done to determine how effective and safe docetaxel and trastuzumab are before surgery in Nigerian women with breast cancer.
    Location: University of Chicago Comprehensive Cancer Center, Chicago, Illinois

  • To Evaluate the Safety, Tolerability, and Pharmacokinetics of Inavolisib Single Agent in Participants With Solid Tumors and in Combination With Endocrine and Targeted Therapies in Participants With Breast Cancer

    This is an open-label, multicenter, Phase I study designed to evaluate the safety, tolerability, and pharmacokinetics of inavolisib administered orally as a single agent in patients with locally advanced or metastatic PIK3CA-mutant solid tumors, including breast cancer, and in combination with standard-of-care endocrine and / or targeted therapies for the treatment of locally advanced or metastatic PIK3CA-mutant breast cancer. Participants will be enrolled in two stages: a dose-escalation stage (Stage I) and an expansion stage (Stage II). Participants will be assigned to one of seven regimens: inavolisib as a single agent (Arm A), inavolisib in combination with palbociclib and letrozole (Arm B), inavolisib in combination with letrozole (Arm C), inavolisib in combination with fulvestrant (Arm D), inavolisib in combination with palbociclib and fulvestrant (Arm E), inavolisib in combination with palbociclib, fulvestrant, and metformin (Arm F), and inavolisib in combination with trastuzumab and pertuzumab (and letrozole or fulvestrant, if applicable (Arm G)).
    Location: 5 locations

  • Study to Test the Safety and Tolerability of PF-07220060 in Participants With Advance Solid Tumors

    This is a Phase 1, open label, multicenter, nonrandomized, multiple dose, safety, tolerability, pharmacokinetic and pharmacodynamic study of PF-07220060 administered as a single agent and then in combination with endocrine therapy. In Part 1A, single escalating doses of PF-07220060 alone will be administered to determine the maximum tolerated dose (MTD) and select the recommended phase 2 dose (RP2D). In Part 1B and Part 1C, PF-07220060 will be administered in combination with 1 of 2 endocrine therapies (letrozole and fulvestrant, respectively). Part 1B and Part 1C may be enrolled and conducted in parallel at the completion of Part 1A.
    Location: 4 locations

  • PF-07104091 as a Single Agent and in Combination Therapy

    To assess the safety and tolerability of increasing doses of PF-07104091 and to estimate the Maximum Tolerated Dose (MTD) and / or select the Recommended Phase 2 dose (RP2D) for PF 07104091 as a single agent in participants with small cell lung, non small cell lung ovarian and breast cancers.
    Location: 4 locations

  • Abemaciclib and Letrozole in Treating Patients with Recurrent, Metastatic, or Resistant Endometrial Cancer

    This phase II trial studies how well abemaciclib and letrozole work in treating patients with endometrial cancer that has come back (recurrent), spread to other places in the body (metastatic) or remains despite treatment (resistant). Abemaciclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Letrozole is a hormonal therapy that works by lowering the production of estrogen in the body. Estrogen may help to stimulate cancer cells to grow, so lowering the levels of estrogen in the body may work to slow cancer cell growth. Giving abemaciclib together with letrozole may work better in treating patients with endometrial cancer.
    Location: 4 locations

  • PF-06804103 Dose Escalation in HER2 Positive and Negative (Negative Only in Part 2) Solid Tumors

    The study will evaluate the safety, pharmacokinetics and pharmacodynamics of increasing doses of PF-06804103 in patients with HER2 positive and negative breast and gastric cancer (HER2 positive only and gastric were studied in Part 1A only). The study will expand to look at selected doses in patients with HER2 positive and negative breast cancer.
    Location: 5 locations

  • This Study in Patients With Different Types of Cancer (Solid Tumours) Aims to Find a Safe Dose of Xentuzumab in Combination With Abemaciclib With or Without Hormonal Therapies. The Study Also Tests How Effective These Medicines Are in Patients With Lung and Breast Cancer.

    This is a study in adult patients with different types of cancer. The purpose of this study is to find a safe dose of: - Xentuzumab in combination with abemaciclib - Xentuzumab in combination with abemaciclib and hormonal therapies The study also tests whether these medicines make tumours shrink in participants with lung and breast cancer. Participants can stay in the study as long as they benefit from and can tolerate treatment. All participants get xentuzumab infusions and abemaciclib tablets. Participants who have breast cancer get different types of hormonal therapies in addition to xentuzumab and abemaciclib. For all participants, the size of the tumour is measured regularly. Doctors also regularly check the general health of the participants."
    Location: 4 locations

  • Anastrozole and Letrozole after Surgery for the Treatment of Stage I-III Breast Cancer

    This phase II trial studies how well anastrozole and letrozole after surgery work in treating patients with stage I-III breast cancer. Drugs, such as anastrozole and letrozole, may stop the growth of tumor cells by decreasing the amount of estrogen made by the body. Giving anastrozole and letrozole after surgery may prevent breast cancer from coming back (recurrence).
    Location: 3 locations

  • Fulvestrant and Palbociclib in Treating Older Patients with Hormone Responsive Breast Cancer That Cannot Be Removed by Surgery

    This phase II trial studies how well fulvestrant and palbociclib works in treating older patients with breast cancer that responds to hormone treatment (hormone responsive) that cannot be removed by surgery. Estrogen can cause the growth of estrogen-receptor-positive breast cancer cells. Hormone therapy using fulvestrant may fight estrogen-receptor-positive breast cancer by blocking the use of estrogen by the tumor cells. Palbociclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Giving fulvestrant together with palbociclib may be an effective treatment for hormone responsive breast cancer.
    Location: 3 locations

  • Anastrozole or Letrozole before Surgery in Treating Patients with Hormone Receptor Positive Stage II-III Breast Cancer That Can Be Removed by Surgery

    This pilot early phase I trial studies how well anastrozole or letrozole before surgery work in treating patients with hormone receptor positive stage II-III breast cancer that can be removed by surgery. Estrogen can cause the growth of breast cancer cells. Hormone therapy using anastrozole and letrozole may fight hormone receptor positive breast cancer by lowering the amount of estrogen the body makes and blocking the use of estrogen by the tumor cells.
    Location: 3 locations

  • Hormonal Therapy after Pertuzumab and Trastuzumab for the Treatment of Hormone Receptor Positive, HER2 Positive Breast Cancer, the ADEPT study

    This phase II trial studies the effect of hormonal therapy given after (adjuvant) pertuzumab and trastuzumab in treating patients with hormone receptor positive, HER2 positive breast cancer. The drugs trastuzumab and pertuzumab are both monoclonal antibodies, which are disease-fighting proteins made by cloned immune cells. Estrogen can cause the growth of breast cancer cells. Hormonal therapy, such as letrozole, anastrozole, exemestane, and tamoxifen, block the use of estrogen by the tumor cells. Giving hormonal therapy after pertuzumab and trastuzumab may kill any remaining tumor cells in patients with breast cancer.
    Location: 2 locations

  • Abemaciclib and Letrozole in Treating Patients with Endometrial Cancer

    This early phase I trial studies how well abemaciclib and letrozole work in treating patients with endometrial cancer and determines whether there are changes in patients' cancer cell biomarkers (a genetic feature or specific protein) for cell growth before and after treatment. Antihormone therapy with aromatase inhibitors, such as letrozole, may lessen the amount of estrogen made by the body. Abemaciclib blocks the activities of a class of proteins called cyclin-dependent kinase, which are involved in cell duplication. Giving letrozole and abemaciclib together may slow down cancer cell growth in patients with endometrial cancer.
    Location: 2 locations

  • Talimogene Laherparepvec with Chemotherapy or Endocrine Therapy in Treating Patients with Metastatic, Unresectable, or Recurrent HER2- Negative Breast Cancer

    This phase Ib trial studies the side effects and how well talimogene laherparepvec works when given together with chemotherapy or endocrine therapy in treating patients with breast cancer that does not express the human epidermal growth factor receptor 2 (HER2) protein and has spread to other places in the body (metastatic), cannot be removed by surgery (unresectable), or has come back (recurrent). Biological therapies, such as talimogene laherparepvec, use substances made from living organisms that may attack specific tumor cells and stop them from growing or kill them. Chemotherapy drugs, such as nab-paclitaxel, gemcitabine, and carboplatin, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Estrogen can cause the growth of breast cancer cells. Drugs used as endocrine therapy, such as letrozole, anastrozole, exemestane, tamoxifen or fulvestrant, may lessen the amount of estrogen made by the body or may stop the growth of tumor cells by blocking estrogen from connecting to the cancer cells. Giving talimogene laherparepvec with chemotherapy or endocrine therapy may work better in treating patients with HER2-negative breast cancer.
    Location: 2 locations

  • A Phase II, Two-Arm Study of Everolimus and Letrozole, + / - Ribociclib (Lee011) in Patients with Advanced or Recurrent Endometrial Carcinoma

    This phase II trial studies how well everolimus and letrozole with or without ribociclib work in treating participants with endometrial cancer that has spread to other areas of the body or has come back. Ribociclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Drugs such as everolimus and letrozole have been shown to be effective at stopping tumor growth either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving ribociclib, everolimus, and letrozole may work better than everolimus and letrozole in treating participants with endometrial cancer.
    Location: 2 locations


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