Estrogen-receptor positive breast cancer

This phase II trial tests whether a planned sequence of targeted therapies can eliminate HER2+ metastatic breast cancer and allow patients to stop treatment. The study enrolls people with stage IV HER2+ breast cancer at diagnosis. Participants receive a series of drug combination…

This early-phase study tests a new drug called HLD-0117 in about 33 women with a type of advanced breast cancer (ER-positive) that has spread and stopped responding to standard therapies. The main goals are to check the drug's safety and find the right dose, while also seeing if …

This study compares two treatments for people with high-stage, estrogen-positive, HER2-negative breast cancer that has a low genetic risk of returning. One group gets standard hormone therapy plus a targeted pill (ribociclib), while the other gets chemotherapy first, then the sam…

This study tests whether the drug elacestrant can clear traces of cancer DNA found in the blood of people with hormone receptor-positive breast cancer who are at risk of late recurrence. About 50 adults whose blood tests positive for tumor DNA but show no visible spread will take…

This early-stage trial tests an experimental oral drug called SHY-ONC6 in people with advanced or metastatic solid tumors (including breast, colon, lung, pancreatic, and others) that have stopped responding to standard treatments. The study aims to find a safe dose and check for …

This Phase 3 trial tests whether elacestrant, a new hormone therapy, can prevent distant metastasis better than standard hormone therapies in 220 patients with ER+/HER2- breast cancer whose blood tests show signs of cancer DNA (ctDNA) but no visible spread. Participants are rando…

This study tests a new drug called rezatapopt (PC14586) in people with advanced solid tumors that have a specific TP53 Y220C mutation. The drug is designed to reactivate the p53 protein, which normally helps stop cancer growth. The trial will also test rezatapopt combined with th…

This phase 3 trial is testing a daily pill called giredestrant in 300 people with ER+/HER2- early breast cancer who had to stop standard aromatase inhibitors due to side effects. The study will track how well patients stick with the treatment, their quality of life, and any side …

This study tests a new drug called GDC-4198, alone or combined with another drug (giredestrant), against a standard treatment (abemaciclib plus giredestrant) in people with advanced ER+/HER2- breast cancer that has worsened after prior CDK4/6 inhibitor therapy. The trial has two …

This phase 3 trial is testing two oral drugs, camizestrant and ribociclib, as a first treatment for people with ER-positive, HER2-negative advanced breast cancer. The goal is to see if the combination can delay the need for next cancer therapy. About 150 participants will take th…

This study tests a new oral drug called imlunestrant in premenopausal women with estrogen receptor-positive, HER2-negative breast cancer. Some participants will also receive a drug to suppress ovarian function. The effects on tumor cells and ovaries will be compared with those of…

This study tests a new drug, LY4257496, that delivers radiation directly to cancer cells with a specific protein (GRPR). It is for adults with advanced solid tumors like breast, prostate, or colorectal cancer that have not responded to other treatments. The goal is to see if the …

This study tests two oral drugs, AMXT 1501 and DFMO, given alongside standard treatments for people with advanced solid tumors (breast cancer or melanoma) that have worsened after prior therapies. The goal is to find a safe dose and see if the combination helps shrink tumors or s…

This phase 2 trial is testing whether adding a CDK4/6 inhibitor (palbociclib, abemaciclib, or ribociclib) to elacestrant works better than elacestrant alone for people with advanced ER+/HER2- breast cancer that has already been treated with a CDK4/6 inhibitor. The study will enro…

This study is testing several different drug combinations in people with advanced ER-positive breast cancer that has stopped responding to prior treatments. The trial is designed like an 'umbrella,' allowing new drug combos to be added as they become available. About 316 particip…

This phase 2 trial is testing whether giving a combination of three drugs—neratinib, an aromatase inhibitor (letrozole or anastrozole), and trastuzumab—before surgery can completely eliminate invasive breast cancer in postmenopausal women with ER-positive, HER2-positive breast ca…

This phase I/II platform trial tests several drug combinations, including evorpacept, trastuzumab deruxtecan, zanidatamab, tucatinib, and TTX-MC138, in people with advanced solid tumors, especially metastatic breast cancer. The goal is to find safe and promising regimens that cou…

This study tests whether combining the drug inavolisib with other treatments can safely shrink or eliminate early-stage breast tumors that have a specific genetic change (PIK3CA mutation). About 60 people with untreated stage II-III breast cancer will receive the drug combination…

This study compares a combination of two drugs (elacestrant and capecitabine) to capecitabine alone in people with advanced estrogen receptor-positive breast cancer that no longer responds to CDK 4/6 inhibitors. About 297 participants will be randomly assigned to one of the two t…

This study tests whether adding everolimus to elacestrant can help people with a certain type of advanced breast cancer (ER+/HER2- with an ESR1 mutation) live longer without their cancer getting worse. About 240 adults whose cancer has stopped responding to standard hormone thera…

This phase II trial tests two drugs, imlunestrant and abemaciclib, in 42 people with ER+ breast cancer who have tiny amounts of cancer DNA still in their blood after initial treatment. The goal is to see if the combination can clear these leftover cancer cells. Participants will …

This study tests a new daily pill, camizestrant, against standard hormone therapies to see if it better prevents breast cancer from returning in people with ER+/HER2- early breast cancer who are at intermediate or high risk. About 4,300 participants who have already completed ini…

This phase 3 trial is testing a new drug called palazestrant (OP-1250) combined with ribociclib against the standard letrozole plus ribociclib for people with ER+, HER2- advanced breast cancer who haven't had prior treatment. About 1,000 participants will be randomly assigned to …

This study tests an experimental drug called AZD9574, taken alone or with other anti-cancer medicines, in about 695 people whose advanced solid tumors have grown despite prior treatment. The main goals are to check the drug's safety and find the right dose. Researchers will also …

This phase 2 trial tests whether giving the chemotherapy drug capecitabine in a flexible, response-based way (adaptive therapy) can better control metastatic ER-positive breast cancer. About 35 adults with advanced, hormone-resistant disease will receive doses that are adjusted b…

This phase 2 trial is testing whether the investigational drug datopotamab deruxtecan (Dato-DXd) can safely and effectively treat HER2-negative breast cancer that has spread to the brain. The study enrolls adults with metastatic breast cancer who have brain metastases that are ei…

This early-phase trial is testing a new drug called AZD8421, alone or with other cancer drugs, in people with advanced ER+ breast cancer or high-grade ovarian cancer. The study aims to find safe doses and see if the drug can shrink tumors. About 564 women aged 18 and older will t…

This trial tests whether using only hormone-blocking drugs can control breast cancer in women aged 70 and older who have a low-risk, hormone-sensitive tumor. Participants receive standard endocrine therapy instead of surgery or radiation. The goal is to see if this gentler approa…

This trial investigates whether combining high-intensity focused ultrasound (HIFU) with the immunotherapy drug toripalimab and standard chemotherapy can improve outcomes for people with ER+/HER2- breast cancer before they undergo surgery. The study enrolls women aged 18-75 with i…

This study tests whether giving a precise, high-dose radiation treatment called SBRT to one growing tumor can help people with metastatic breast cancer keep their disease under control. Participants continue their usual drug therapy while receiving SBRT to a single site where can…

This study tests a new way to treat early-stage ER+ breast cancer using a single, strong dose of radiation before surgery. It also explores using a special ultrasound with microbubbles to check lymph nodes without a surgical biopsy. The goal is to see if this approach can elimina…

This study tests if a combination of three drugs (lenvatinib, pembrolizumab, and fulvestrant) is safe and works for people with ER-positive, HER2-negative breast cancer that has spread. About 54 adults whose cancer has not responded to other treatments will take part. The goal is…

This Phase III trial is for women aged 65 and older with early-stage, hormone-sensitive breast cancer. Half will take hormone-blocking pills for three months before surgery, while the other half will proceed directly to surgery as usual. The goal is to see if the pre-surgery pill…

This study tests whether a new drug combination (lasofoxifene plus abemaciclib) works better than a standard combination (fulvestrant plus abemaciclib) for people with advanced ER+/HER2- breast cancer that has a specific gene change (ESR1 mutation). About 500 adults whose cancer …

This study tests a new drug called IDE574 in people with advanced solid tumors or a specific type of breast cancer (ER+, HER2-). The drug targets two enzymes that help cancer cells grow. The study has two parts: first, testing IDE574 alone in various cancers; second, combining it…

This expanded access program provides giredestrant, a daily oral drug, to people with ER-positive, HER2-negative breast cancer (early or advanced) who have limited treatment options. The goal is to offer early access before the drug is commercially available in the US. Participan…

This phase 3 trial tests whether tamoxifen or letrozole works better for preserving fertility in women with estrogen-sensitive breast cancer before starting chemotherapy. About 309 participants will take one of the two drugs during ovarian stimulation to freeze their eggs. The ma…

This study looks at whether giving hormone therapy before breast-conserving surgery helps reduce leftover cancer cells at the edges of removed tissue. It involves 176 postmenopausal women with stage 2-3 ER+/HER2- invasive lobular carcinoma. The goal is to see if this approach lea…

This phase 2 trial is testing elacestrant, a pill that breaks down estrogen receptors, in 30 people with advanced uterine sarcomas that are fueled by estrogen. The goal is to see if the drug can shrink tumors or slow their growth. Participants must have tumors that strongly expre…

This study tests a new drug called QLS1304 combined with standard hormone therapy in people with advanced ER+/HER2- breast cancer whose disease has worsened after at least one prior hormone treatment. The trial has two phases: first finding the best dose, then checking how well i…

This study is for women with early-stage breast cancer that has spread to 1-2 lymph nodes. It tests whether skipping radiation to the lymph nodes can reduce side effects and improve quality of life without increasing the risk of cancer coming back. About 1,350 participants will b…

This phase 2 trial is testing whether a liquid biopsy (a simple blood test) can help choose the right treatment for people with ER+/HER2- metastatic breast cancer that has stopped responding to standard therapies. About 484 participants will be assigned to one of several drug arm…

This phase 2 study tests estradiol, a form of estrogen, in postmenopausal women with advanced ER+ breast cancer that has stopped responding to other hormone therapies. The goal is to see if patients with a specific genetic change (ESR1 mutation) benefit more than those without it…

This study tests a new drug called PF-07248144, alone or combined with other cancer treatments, in people with advanced breast, prostate, or lung cancers that have not responded to standard therapy. The trial aims to find safe doses and check for early signs of tumor shrinkage. A…

This study is for people with early-stage ER+ breast cancer who still have hidden cancer cells in their bone marrow after surgery and standard therapy. It tests whether adding drugs like hydroxychloroquine or avelumab, with or without palbociclib, can clear those leftover cells a…

This phase 2 trial is testing whether turkey tail mushroom extract can slow or shrink estrogen receptor-positive, HER2-negative breast cancer in post-menopausal women. Forty participants will take the supplement between diagnosis and surgery, and researchers will measure changes …

This early-stage trial is testing a new daily oral medication called ETX-19477 in about 120 adults with advanced solid tumors, including breast, ovarian, prostate, and other cancers. The drug blocks a protein called PARG to interfere with cancer cells' ability to repair themselve…

This study is for people with certain types of breast cancer (HER2-positive or triple-negative) who have a complete response to initial drug therapy. It tests whether they can safely skip surgery and only receive radiation, or skip radiation if surgery shows no cancer left. For a…

This early-phase trial tests a new oral drug called AND019 in 61 postmenopausal women with advanced or metastatic ER+/HER2- breast cancer who have not responded to standard treatments. The main goals are to check safety, find the right dose, and see early signs of tumor shrinkage…

This study tests whether adding the immunotherapy drug pembrolizumab, with or without the targeted drug olaparib, to standard radiation therapy is safe and effective for people with metastatic triple-negative or hormone-receptor-positive/HER2-negative breast cancer. About 34 adul…

This study tests a new drug called FWD1802 in people with a common type of advanced breast cancer (ER+/HER2-). The goal is to find a safe dose and see if it can shrink tumors. About 99 women with cancer that has spread or cannot be removed by surgery will take part. The study has…

This phase 2 trial tests whether giving precise radiation (SBRT) to a few growing cancer spots can help women with ER+/HER2- metastatic breast cancer stay on their current hormone therapy or CDK4/6 inhibitor longer. The study enrolls 48 women whose cancer has started to progress …

This study tests a combination of two drugs, fulvestrant and abemaciclib, for people with a certain type of advanced breast cancer (ER-positive, HER2-negative) that has stopped responding to a first-line treatment called a CDK4/6 inhibitor. The goal is to see if taking a break fr…

This study tests an experimental oral drug called JAB-2485 in adults with advanced solid tumors, including certain breast and lung cancers. The goal is to see if the drug is safe and can shrink tumors. About 102 participants will receive the drug, and researchers will monitor sid…

This study is for people with a common type of advanced breast cancer (ER-positive/HER2-negative) that cannot be removed by surgery or has spread. It tests a new drug called FWD1802 combined with other treatments to find the safest dose and see if it shrinks tumors. About 196 par…

This study is for people with early-stage ER+/HER2- breast cancer. It tests whether adding doxycycline, a safe and inexpensive antibiotic, to standard chemotherapy can better target cancer stem cells—cells that may cause the cancer to come back. About 50 participants will receive…

This phase 2 trial is testing whether the drug elacestrant alone works as well as elacestrant combined with a drug that suppresses ovarian function (leuprorelin) in premenopausal women with early-stage, hormone-receptor-positive breast cancer. The study involves 140 women who wil…

This early-stage study tests the safety of combining two drugs, olaparib and estradiol, in post-menopausal women with advanced ER+/HER2- breast cancer that has spread or returned. The goal is to find the best dose for future studies. About 6 participants will be enrolled.

This study tests whether giving radiation again after a second lumpectomy is safe for women with a common type of breast cancer (ER+HER2-). About 114 women who had radiation before and whose cancer came back at least 18 months later will receive targeted radiation over 3 weeks. T…

This early-phase study tests a new drug called OP-3136 in people with advanced breast, lung, or prostate cancers that have not responded to other treatments. The drug works by blocking certain enzymes that help cancer cells grow. The study will first find a safe dose, then test i…

This study tests whether precise radiation (SBRT) can treat a few growing tumors in patients with ER+ breast cancer that has spread, allowing them to continue their current medication longer. About 18 adults with limited disease progression will receive SBRT and be monitored. The…

This phase 2 trial tests a new radioactive tracer called 4FMFES for PET scans in people with advanced estrogen receptor positive (ER+) breast cancer. The tracer binds to estrogen receptors, allowing doctors to see where the cancer has spread anywhere in the body. The study aims t…

This early study tests a new imaging device that combines two types of breast scans to see how well it detects estrogen-receptor-positive breast cancer. Up to 20 women with newly diagnosed breast cancer will receive an injection of a radioactive tracer and then be scanned. The re…

This study aims to improve how doctors find and treat breast cancer that has spread to the brain. Twenty adults with ER-positive breast cancer and brain tumors will get an extra PET scan (FES PET/CT) before their standard radiation planning. Researchers will compare this scan wit…

This study compares two PET scan tracers—standard 18F-FDG and newer 68Ga-FAPI-46—in 20 women with ER-positive breast cancer. The goal is to see if the new tracer finds more cancer lesions, especially where the standard one may miss them. Better detection could lead to more accura…

This study is for premenopausal women at higher-than-average risk for breast cancer. It tests whether a low dose of tamoxifen can safely reduce breast density, which is linked to cancer risk. About 200 women will take tamoxifen, and doctors will adjust the dose if needed to get t…

This study tests whether Reishi mushroom extract can reduce fatigue and joint pain in breast cancer patients taking aromatase inhibitors. About 80 women with moderate to severe fatigue will receive either the mushroom extract or a placebo for 8 weeks. The goal is to see if this n…

This study is for people with metastatic breast cancer, including estrogen receptor-positive and triple-negative types. It uses biomarkers from tumors and blood to guide treatment choices, comparing how long the cancer stays controlled on the new therapy versus the previous one. …

Researchers are studying whether blood and tissue samples can show when metastatic breast cancer stops responding to standard first-line treatment with an aromatase inhibitor and a CDK4/6 inhibitor. The study enrolls women with ER-positive, HER2-negative metastatic breast cancer …

This study is testing whether it is safe for women aged 70 and older with small, screen-detected, ER+/HER2- breast cancers to simply monitor the tumor with regular ultrasounds instead of undergoing immediate treatment like surgery or radiation. The main goal is to see how many tu…

This study is testing a new web and mobile app called SHIELD, designed to support women with hormone receptor-positive breast cancer who are on long-term hormone therapy. The goal is to see if the app is easy to use and helpful for managing treatment. About 30 women will particip…

This pilot study tests whether a special PET scan (FES-PET/CT) can help doctors find the best dose of tamoxifen for people with metastatic breast cancer that has an ESR1 mutation. These mutations can make standard tamoxifen doses less effective. The study will enroll 12 participa…

This study follows 500 postmenopausal women with advanced ER+ HER2- breast cancer that has an ESR1 mutation. Participants receive elacestrant as part of their normal care. Researchers will track quality of life, side effects, and how the cancer responds over time. The goal is to …

This study looks at how breast cancer cells change after a short course of hormone therapy in women with and without a BRCA2 gene mutation. Researchers will measure a protein called Ki67, which indicates how fast cancer cells are growing. The goal is to see if BRCA2 carriers have…

This study looks at how aromatase inhibitor therapy changes skin quality and self-esteem in breast cancer survivors. Researchers will use skin imaging and surveys to track changes in 35 women starting this hormone therapy. The goal is to better understand and manage these side ef…

This study tests whether a special PET scan (EstroTEP) and blood tests can help doctors pick the best second-line treatment for people with ER-positive, HER2-negative metastatic breast cancer. About 300 participants will be assigned to either endocrine therapy or chemotherapy bas…

This study is for 500 adults with non-metastatic breast cancer who are about to start treatment like chemotherapy or targeted therapy before surgery. Researchers will collect tumor tissue, blood, and sometimes stool samples and MRI scans during treatment. The goal is to learn why…

This study tests whether a decision aid and training for surgeons can help women aged 70 and older with low-risk stage I breast cancer make better treatment choices. About 402 participants will be split into two groups: one where surgeons get shared decision-making training and p…

This study follows 700 adults with advanced or metastatic breast cancer who are taking CDK4/6 inhibitors (ciclib drugs). Researchers collect blood, tissue, and fluid samples to understand how the cancer responds, why resistance develops, and how well patients do over time. The go…