Clinical trials
ER Positive Breast Cancer clinical trials
Below are recruiting er positive breast cancer clinical trials, each written for real people, not researchers. We’re tracking 437 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05181033RecruitingPhase 2
Lenvatinib plus letrozole versus fulvestrant for metastatic breast cancer
This Phase 2 study compares a combination medicine (lenvatinib plus letrozole) against fulvestrant to treat metastatic estrogen-receptor positive, HER2-negative breast cancer after the cancer has grown despite hormone therapy plus a CDK4/6 inhibitor. It may help by finding a more effective treatment option after your first lines have stopped working.
SingaporeAges 18–99 - NCT05187832RecruitingPhase 1
Study drug for ER-positive, HER2-negative breast cancer in postmenopausal women
This Phase 1 trial tests AND019, a new study drug, in postmenopausal women with advanced or metastatic ER-positive and HER2-negative breast cancer. It aims to see if the drug is safe and can control the cancer when other standard treatments have stopped working.
Nashville, TennesseeAges 18 years+ - NCT05205200RecruitingPhase 2
Immune therapy for HR-positive, HER2-negative metastatic breast cancer
This Phase 2 trial studies an immune-based treatment for women with HR-positive and HER2-negative breast cancer that has spread or returned and can’t be cured with local treatment alone. The goal is to see whether the therapy can shrink tumors and improve disease control with acceptable safety.
ShanghaiAges 18–75 - NCT05292742RecruitingPhase 2
Continue targeted breast cancer therapy or switch to a new combo
This Phase 2 study compares two treatment plans after breast surgery when cancer did not fully disappear before surgery. It tests whether adding trastuzumab, pyrotinib, and capecitabine works better than continuing the original targeted therapy.
Fuzhou, FujianAges 18–75 - NCT05333328RecruitingPhase 4
Test of ovarian function suppression for low-risk premenopausal node+ breast cancer
This trial studies whether ovarian function suppression (a treatment that lowers hormone production from the ovaries) helps women with hormone-receptor positive, HER2-negative breast cancer that has spread to lymph nodes, but who have a low-risk result on a genomic test. It may help reduce breast cancer recurrence while avoiding more intensive treatment for those who are lower risk.
Seoul, KoreaAges 20–50 - NCT05362760RecruitingPhase 4
Abemaciclib plus hormone therapy, with digital side-effect tracking
This trial tests whether adding abemaciclib to standard hormone (endocrine) therapy can improve outcomes for certain types of advanced breast cancer. It also uses a phone app to help you and the team track side effects so problems can be caught early.
AalenAges 18 years+ - NCT05378204Recruiting
Testing DNA repair marker for PARP inhibitor resistance
This study looks at specific DNA “damage repair” proteins as a marker to understand why some BRCA-mutated breast cancers may resist PARP inhibitor treatment. Your biopsy (or existing biopsy) helps researchers study whether these lab markers relate to how well PARP inhibitors work.
BordeauxAges 18 years+ - NCT05386108RecruitingPhase 1/Phase 2
Test abemaciclib plus elacestrant for breast cancer brain spread
This trial studies whether the combination of abemaciclib and elacestrant can slow or shrink ER-positive, HER2-negative breast cancer that has spread to the brain. It is designed for people whose cancer has progressed despite prior hormone (endocrine) treatment.
Fullerton, CaliforniaAges 18 years+ - NCT05388149RecruitingPhase 2
Neratinib plus Kadcyla to treat leftover HER2 breast cancer
This trial studies whether adding neratinib to Kadcyla (T-DM1) can help eliminate “molecular residual disease,” meaning tiny traces of cancer left after surgery and standard HER2 treatment. It’s for adults with HER2-positive breast cancer who still test positive after a short course of Kadcyla, with no signs of cancer returning or spreading on scans.
Toronto, OntarioAges 18 years+ - NCT05396612Recruiting
Studying the immune response in non-cancer-spread breast surgery
This study looks at how your immune system changes while you receive standard breast cancer treatment around the time of surgery. The goal is to learn why some people respond better than others, which could help future treatment choices.
Philadelphia, PennsylvaniaAges 18 years+ - NCT05420454RecruitingPhase 4
Neoadjuvant treatment for breast cancer before surgery
This trial tests a treatment given before breast surgery to shrink breast cancer and improve outcomes based on your tumor type. Your eligibility depends on tumor size/stage, hormone and HER2 markers, and overall health checks.
Hangzhou, ZhejiangAges 18 years+ - NCT05420467RecruitingPhase 4
Trial of add-on breast cancer treatment after surgery
This Phase 4 study tests an additional (adjuvant) treatment for breast cancer after surgery and standard follow-up care. It may help lower the chance the cancer comes back, but you must match specific tumor and body-chemistry requirements to join.
Hangzhou, ZhejiangAges 18 years+ - NCT05452213RecruitingPhase 4
Study patterns of ribociclib response and resistance in breast cancer
This trial looks at how well ribociclib works and why it may stop working over time in people with advanced, hormone-receptor–positive, HER2-negative breast cancer. It also analyzes blood and tissue samples to help researchers understand resistance patterns and improve future treatment decisions.
Erlangen, BavariaAges 18 years+ - NCT05491226RecruitingPhase 2
Pembrolizumab plus radiation and myeloid-targeting for high-risk breast cancer
This trial studies whether adding pembrolizumab (an immune “unlocking” drug) to radiation and another treatment that targets certain immune cells can improve outcomes for women with high-risk, early-stage triple negative breast cancer. You may be considered if your cancer has signs that it may respond less to immunotherapy on its own.
Los Angeles, CaliforniaAges 18 years+ - NCT05501704RecruitingPhase 2
Testosterone-blocking therapy for male breast cancer
This Phase 2 study tests an oral treatment (called “ET”) to treat hormone-receptor–positive, HER2-negative invasive breast cancer in men. It may help shrink or control cancer without using standard cancer treatments first.
Washington D.C., District of ColumbiaAges 18 years+ - NCT05504707RecruitingPhase 1
Study drug for early-stage, HER2-negative, low-risk hormone breast cancer
This Phase 1 trial tests a new study drug called DC1 given before standard breast cancer treatments. It focuses on people with HER2-negative breast cancer that is “hormone negative” or “hormone low,” aiming to see if the treatment is safe and whether it may work before surgery or other local therapy.
Tampa, FloridaAges 18 years+ - NCT05508906RecruitingPhase 1
Test drug OP-1250 with other medicines in ER-positive breast cancer
This Phase 1b study tests OP-1250 (palazestrant) combined with other targeted medicines for ER-positive, HER2-negative advanced or metastatic breast cancer. It mainly looks at safety and correct dosing, but may also help shrink tumors or slow growth.
Gilbert, ArizonaAges 18 years+ - NCT05524584RecruitingPhase 2
Anastrozole, fulvestrant, and abemaciclib for hormone-positive breast cancer
This trial tests whether combining three medicines can better control hormone-receptor–positive, HER2-negative metastatic breast cancer that cannot be cured with surgery or radiation. It may help shrink tumors and slow disease growth compared with standard hormone therapy approaches.
Orange, CaliforniaAges 18 years+ - NCT05573126RecruitingPhase 1/Phase 2
Study of EP0062 for advanced breast cancer with AR+ and ER+
This Phase 1/2 study tests EP0062, a study medicine given alone or with other treatments, in people with advanced or metastatic breast cancer. It’s designed to see how well it works and what side effects it causes when the cancer has specific hormone-receptor markers (AR+ and ER+) and is HER2-negative.
New Haven, ConnecticutAges 18 years+ - NCT05582499RecruitingPhase 2
Neoadjuvant treatment study for certain breast cancers
This Phase 2 study tests a “precision platform” approach—treatment before surgery—based on specific test results from your breast tumor. It may help determine whether the treatment plan works better for people with particular breast cancer subtypes and healthy organ function.
Shanghai, Shanghai MunicipalityAges 18–70 - NCT05594095RecruitingPhase 2
Study for advanced ER+ HER2− breast cancer after CDK4/6 therapy
This Phase 2 trial tests an investigational “SNF platform” treatment for advanced ER+ (estrogen-receptor positive) and HER2− breast cancer in people who already tried CDK4/6 inhibitor therapy. It may help shrink tumors and improve outcomes for cancers that have come back or spread.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT05601440RecruitingPhase 2
Trial for metastatic breast cancer that resisted CDK4/6 treatment
This Phase 2 study tests treatments guided by blood testing (“liquid biopsy”) in people with hormone receptor–positive, HER2-negative metastatic breast cancer that has progressed after standard CDK4/6 medicine plus hormone therapy. It aims to find a better way to control cancer after the first treatment stops working.
Calgary, AlbertaAges Any age - NCT05608252RecruitingPhase 1/Phase 2
Drug combination for advanced ER-positive, HER2-negative breast cancer
This Phase 1/2 study tests how well a new treatment combination (VS-6766, abemaciclib, and fulvestrant) works for metastatic or hard-to-remove breast cancer that is hormone-driven (ER/PR positive) and HER2 negative. It is mainly designed to find the safest dose and then see whether it can control the cancer after it has progressed on certain prior medicines.
Boston, MassachusettsAges 18 years+ - NCT05638594RecruitingPhase 2
Neoadjuvant drug study for hormone- and HER2-positive breast cancer
This trial compares two combination treatment plans given before breast surgery (neoadjuvant therapy) for ER-positive and HER2-positive stage II–III breast cancer. It aims to see which plan works better to shrink the tumor and improve outcomes.
Shenyang, LiaoningAges 18–75
Hear when a new ER Positive Breast Cancer trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.
Common questions
- Are there clinical trials for er positive breast cancer?
- Yes. Clin2 currently lists 437 recruiting er positive breast cancer studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a er positive breast cancer trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a er positive breast cancer trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
- Breast Cancer Early Stage Breast Cancer (Stage 1-3)
- Breast Cancer (Triple Negative Breast Cancer (TNBC))
- HER2-positive Breast Cancer
- Hormone-receptor-positive Breast Cancer
- Estrogen-receptor-positive Breast Cancer
- HER2-positive Metastatic Breast Cancer
- Hormone Receptor Positive HER-2 Negative Breast Cancer
- Node-positive Breast Cancer
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.