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8 clinical studies listed.

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Estrogen-receptor-positive Breast Cancer

Tundra lists 8 Estrogen-receptor-positive Breast Cancer clinical trials. Each listing includes eligibility criteria, study locations, and direct links to research sites in the Tundra directory.

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NOT YET RECRUITING

NCT07499999

Randomized Double-Blind Phase II Trial of Baby Exemestane Versus Baby Tamoxifen in Post-Menopausal Women at High Risk for Breast Cancer

The goal of this research study is to evaluate the efficacy and safety of low-dose exemestane versus low-dose tamoxifen in post-menopausal women at high risk for breast cancer. The names of the study drugs involved in this study are: * Exemestane (a type of steroidal aromatase inhibitor) * Tamoxifen (a type of selective estrogen receptor modulator)

Gender: FEMALE

Updated: 2026-03-30

1 state

Breast Cancer
Ductal Carcinoma
Estrogen-receptor-positive Breast Cancer
+4
NOT YET RECRUITING

NCT07340541

Evolutionary Clinical Trial for Novel Biomarker-Driven Therapies

This is a multicenter, multi-arm, biomarker-stratified trial designed to evaluate biomarker-directed therapies in patients with estrogen receptor-positive/hormone receptor-negative (ER+/HR-) and triple-negative (TN) metastatic breast cancer (MBC). The trial integrates both retrospective and prospective data collection, including archival tumor tissue, medical record abstraction, and prospective tumor and blood sampling prior to initiation of protocol directed treatment. Based on biomarker subtype, participants will receive standard of care therapy. Liquid biopsy will be collected on Cycle 2 Day 1, and then liquid biopsy, imaging and clinical data will be collected at each re-staging. Treatment will continue until discontinuation for progression, toxicity or at the discretion of the treating physician.

Gender: All

Ages: 18 Years - Any

Updated: 2026-03-20

1 state

Breast Cancer
Metastatic Breast Cancer
Triple Negative Breast Cancer
+2
RECRUITING

NCT07222215

PhII Randomized CAPecitabine + ELAcestrant vs. Capecitabine Alone in ER+ Breast Cancer (CAPELA)

The goal of this research study is to compare a combination of two drugs, capecitabine and elacestrant to capecitabine alone as a treatment for advanced estrogen receptor-positive (ER+) breast cancer. This study is designed for participants with cancer that has previously stopped responding to medication in the class of therapy called CDK 4/6 inhibitors, including palbociclib, ribociclib, or abemaciclb. The names of the study drugs involved in this study are: * Elacestrant (a type of selective estrogen receptor degrader) * Capecitabine (a type of fluoropyrimidine antimetabolite)

Gender: All

Ages: 18 Years - Any

Updated: 2026-01-22

1 state

Estrogen-receptor-positive Breast Cancer
Metastatic Breast Cancer
Breast Cancer
+6
RECRUITING

NCT06867484

Breast Re-irradiation After Second Ipsilateral Lumpectomy

The purpose of this research study is to test the safety and possible harms of treating breast cancer with reirradiation, after breast surgery. The researchers want to find out what effects (good and bad) reirradiation has on people who have already received radiation before surgery.

Gender: FEMALE

Ages: 40 Years - Any

Updated: 2025-11-13

1 state

Breast Cancer
Cancer
Cancer of the Breast
+3
RECRUITING

NCT05607004

(Z)-Endoxifen for the Treatment of Premenopausal Women With ER+/HER2- Breast Cancer

This open-label research study is studying (Z)-endoxifen as a possible treatment for pre-menopausal women with ER+/HER2- breast cancer. (Z)-endoxifen belongs to a group of drugs called selective estrogen receptor modulators or "SERM", which help block estrogen from attaching to cancer cells. This study has two parts: a pharmacokinetic part and a treatment part. The PK part (how the body processes the drug) will enroll about 18 participants. All participants will take (Z)-endoxifen capsules daily. Twelve participants will be randomly assigned (50/50 chance) to take (Z)-endoxifen alone or (Z)-endoxifen with a monthly injection of goserelin a drug that temporarily stops the ovaries from making estrogen. This part will help determine the best dose of (Z)-endoxifen by measuring the drug levels in the blood and how long the body takes to remove it. The Treatment Cohort has been simplified to a single study arm (Z)-endoxifen + goserelin. Up to 20 participants will be enrolled that have a baseline Ki-67 ≤ 10% and 45 participants will be enrolled that have a baseline Ki-67\>10%. A key goal of the study is to see if (Z)-endoxifen can slow down or stop tumor growth as measured by a reduction in Ki-67 levels. Tumor tissue samples will be taken by breast biopsy after about 4 weeks of treatment to check levels of this biomarker. If the tumor shows signs of response, participants can continue treatment for up to 24 weeks or until they have surgery. Study participation is up to 6 months (24 weeks of treatment) followed by surgery and a one-month follow up visit.

Gender: FEMALE

Ages: 18 Years - Any

Updated: 2025-10-30

13 states

Breast Neoplasms
Invasive Breast Cancer
Estrogen-receptor-positive Breast Cancer
+1
RECRUITING

NCT06062498

Elacestrant vs Elacestrant Plus a CDK4/6 Inhibitor in Patients With ERpositive/HER2-negative Advanced or Metastatic Breast Cancer

Breast cancer is not only the leading cause of cancer in women, but also the leading cause of cancer deaths in women. Estrogen receptor-positive and HER2-negative breast cancer is the most prevalent breast cancer subtype. Endocrine therapy is the mainstay of treatment; however, due to the varied nature of the disease, development of resistance to this therapeutic approach is very common in the metastatic setting. The purpose of this study is to see whether the effectiveness of elacestrant can be enhanced by combining it with a targeted agent such as a CDK4/6 inhibitor to treat patients with ER+/HER2- or metastatic breast cancer with prior exposure to a CDK4/6 inhibitor.

Gender: All

Ages: 18 Years - Any

Updated: 2025-10-20

1 state

Estrogen-receptor-positive Breast Cancer
HER2/Neu-Negative Breast Cancer
Advanced Breast Cancerv
+1
RECRUITING

NCT06525766

Adaptive Therapy With Capecitabine for Treatment of Metastatic ER Positive, HER2 Negative Breast Cancer

This phase II trial evaluates the effect of capecitabine on tumor response using imaging and tumor markers to adjust dose (adaptive therapy) in patients with estrogen receptor (ER) positive, HER2 negative breast cancer that has spread from where it first started to other areas in the body (metastatic). Capecitabine is in a class of medications called antimetabolites. It is taken up by tumor cells and breaks down into fluorouracil, a substance that kills tumor cells. Adaptive therapy with capecitabine based on tumor burden response may slow or stop the growth of tumor cells in patients with metastatic ER positive, HER2 negative breast cancer.

Gender: All

Ages: 18 Years - Any

Updated: 2025-10-03

1 state

Anatomic Stage IV Breast Cancer AJCC v8
Estrogen-receptor-positive Breast Cancer
Metastatic HER2-Negative Breast Carcinoma
+1
RECRUITING

NCT06150898

Ketorolac and Pregabalin Effects on breaSt Cancer (KePreSt)

Out of all proportion to its short duration, the perioperative period is critical in determining the long-term outcome of cancer. To contribute to a better understanding of the neural and inflammatory mechanisms underlying this issue, we aim to implement a novel intervention based on the preoperative use of non-steroidal anti-inflammatory drugs (NSAIDs) with or without an anti-epileptic drug. Our goal is to understand and transform the perioperative window from being a facilitator of metastatic progression to arresting and/or eliminating residual disease using repurposing drugs

Gender: FEMALE

Ages: 18 Years - 70 Years

Updated: 2025-06-13

1 state

Early-stage Breast Cancer
Estrogen-receptor-positive Breast Cancer