Clinical trials
Breast cancer clinical trials
Cancer that forms in the cells of the breast, the most common cancer in women. We’re tracking 2,473 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT04891068RecruitingPhase 2
Pre-surgery low-dose azacitidine for high-risk early breast cancer
This trial studies whether giving a low dose of azacitidine before surgery can shrink or control high-risk early breast cancer. It’s meant for adults whose cancer has not yet spread to distant organs.
Chicago, IllinoisAges 18 years+ - NCT04899908RecruitingPhase 2
Brain radiation with or without gadolinium nanoparticles for brain metastases
This trial tests whether adding tiny gadolinium-containing nanoparticles to standard brain radiation can better control brain metastases from certain cancers. It is for people with tumors that have grown after immunotherapy, are from certain cancers (like melanoma, GI, or HER2+ breast), are cystic, are large, or have come back after prior radiation.
Boston, MassachusettsAges 18 years+ - NCT04916990Recruiting
Care program for rural adults with several lung and head cancers
This study looks at how to improve care for adults with certain cancers who live in rural areas and may face access problems. It mainly focuses on people receiving cancer treatment at specific Colorado-area hospitals, and who are uninsured or underinsured.
Aurora, ColoradoAges 18–99 - NCT04921137RecruitingPhase 4
Testing benefits and side effects of hormone therapy in older breast cancer patients
This study looks at the potential harms and benefits of hormone (endocrine) therapy in people age 70 and older with early-stage, hormone-receptor–positive breast cancer. It may help doctors choose which hormone treatment approach is safest and most helpful for older patients.
Edmonton, AlbertaAges 70 years+ - NCT07137416RecruitingPhase 1
Testing a new combination of cancer drugs for HER2-positive tumors and breast cancer
This trial tests the safety of combining two drugs, CX-5461 (Pidnarulex) and Trastuzumab Deruxtecan (T-DXd), in people with HER2-positive solid tumors or certain types of breast cancer. If you have advanced cancer that hasn't responded to other treatments, this study may be an option.
Boston, MassachusettsAges 18 years+ - NCT06970912RecruitingPhase 2
ctDNA-Guided Reduced Chemo in HR+/HER2- Breast Cancer
This study is testing whether using a ctDNA blood test can help doctors decide if patients with hormone receptor-positive, HER2-negative breast cancer can safely receive less intensive chemotherapy after surgery. The goal is to reduce side effects while still preventing the cancer from coming back.
Beijing, Beijing MunicipalityAges 18–75 - NCT05142800Recruiting
Screening for Lymphedema in Breast Cancer Targeted Therapy
This study is looking at whether targeted therapy for breast cancer changes the risk of arm swelling (lymphedema). It is a screening trial that uses a machine to measure arm size and check for any swelling early on.
Boston, MassachusettsAges 18–80 - NCT07366112RecruitingPhase 2
CDK4/6 inhibitor plus hormone therapy before breast cancer surgery
This trial tests a combination of a CDK4/6 inhibitor (a type of targeted therapy) with hormone therapy given before surgery for early-stage breast cancer that is hormone receptor-positive and HER2-negative. It aims to see if this approach can shrink tumors and improve outcomes.
Beijing, Beijing MunicipalityAges 18–75 - NCT07600164RecruitingPhase 4
Real-world study of pyrotinib treatment for advanced HER2-positive breast cancer
This study follows patients with advanced breast cancer that has a protein called HER2 to see how well pyrotinib (a targeted drug) works when used in routine clinical practice. You'd be tracked over time to understand how this treatment affects your cancer and quality of life.
Beijing, Beijing MunicipalityAges 18 years+ - NCT04959474Recruiting
Pre-surgery radiation study with or without calorie restriction
This trial looks at whether a planned calorie-reduction diet before surgery can change how early breast cancer responds to a short course of radiation. It may help people understand if diet could improve outcomes alongside standard pre-surgery treatment.
Philadelphia, PennsylvaniaAges 40 years+ - NCT04965766RecruitingPhase 2
Study drug for HER2-negative, advanced breast cancer after prior treatment
This Phase 2 trial tests patritumab deruxtecan (U3-1402) in people with HER2-negative, hormone-receptor positive (HR+) breast cancer that cannot be removed by surgery or has spread. It’s for cancers that have progressed despite endocrine therapy plus a CDK4/6 inhibitor, aiming to shrink tumors and control the disease.
DijonAges 18 years+ - NCT04993014RecruitingPhase 2
De-escalating treatment after HER2-positive breast cancer responds
This study looks at whether some people with HER2-positive breast cancer can safely receive less (de-escalated) treatment after they finish chemotherapy plus HER2-targeted drugs before surgery. It specifically focuses on people whose cancer shows a complete response on the surgery pathology report.
São PauloAges 18 years+ - NCT05013255RecruitingPhase 2
Pioglitazone to treat fatigue in hormone-positive breast cancer
This Phase 2 study tests whether pioglitazone can reduce fatigue in people with certain types of breast cancer. You may be eligible if your cancer is estrogen- and progesterone-positive (ER+/PR+) and you plan surgery soon.
Morgantown, West VirginiaAges 18 years+ - NCT05020574RecruitingPhase 2
Study how the microbiome may affect breast implant infections
This Phase 2 study looks at whether changes in the body’s “microbiome” (the normal germs in and on the body) are linked to infections after breast surgery with implants. It may help doctors better predict and prevent implant infections in people undergoing mastectomy with immediate implant placement.
San Francisco, CaliforniaAges 18 years+ - NCT05020860RecruitingPhase 2
Study how early breast cancer responds on imaging and under a microscope
This Phase 2 study looks at how well early breast cancer shrinks with treatment and how that matches with what doctors find after surgery under the microscope. The goal is to learn better ways to predict and assess treatment success.
Houston, TexasAges 18 years+ - NCT05029999RecruitingPhase 1
Test drugs for HER2-negative advanced breast cancer
This Phase 1 trial tests a combination of immune-targeting drugs (a CD40 medicine and a substance that helps immune cells act) plus chemotherapy in people with HER2-negative advanced breast cancer that has progressed. It aims to find a safer dose and see whether the treatment can shrink tumors or slow the cancer.
Chicago, IllinoisAges 18–99 - NCT05035745RecruitingPhase 1/Phase 2
Selinexor plus talazoparib for advanced triple-negative breast cancer
This trial tests selinexor plus talazoparib in people with advanced, treatment-resistant solid tumors and, separately, advanced triple-negative breast cancer. It aims to see whether this combination can shrink tumors or slow their growth when standard options have not worked.
SingaporeAges 18–99 - NCT05042687Recruiting
Compare a breast imaging scan with MRI in high-risk women
This study compares two ways of imaging the breast—molecular breast imaging (a scan that uses a small radioactive tracer) and standard breast MRI—to better find or rule out breast cancer. You may join if you are considered high risk and already have a breast MRI planned, and you can do both tests close together.
Houston, TexasAges 18 years+ - NCT05044689Recruiting
Study to find risk factors for breast and colon cancer
This study is trying to understand what factors might raise the risk of breast cancer and colon (large bowel) cancer. You may be enrolled either if you have a confirmed cancer diagnosis (cases) or if you do not have cancer (controls).
Ile-Ife, Osun StateAges Any age - NCT05058183Recruiting
Testing shorter chemotherapy for early HER2 or triple‑negative breast cancer
This study looks at whether some people with stage 1 HER2-positive or “triple-negative” breast cancer may safely need less (de-escalated) chemotherapy after surgery. The goal is to keep the cancer risk low while reducing treatment intensity, using special blood testing over time.
LondonAges 18 years+ - NCT05059379RecruitingPhase 3
Different radiation fields after breast cancer surgery
This trial compares two ways of giving radiation to lymph node areas near the collarbone after surgery for invasive breast cancer. It aims to see which radiation approach works better and is safer for preventing cancer returning in these lymph nodes.
Shanghai, Shanghai MunicipalityAges 18–75 - NCT05063136RecruitingPhase 3
Metronomic capecitabine with hormone therapy after breast cancer
This trial studies whether a low-dose “metronomic” chemotherapy medicine (capecitabine) added to standard hormone therapy can reduce breast cancer coming back. It is for people with hormone-receptor–positive, HER2-negative breast cancer after surgery and chemo.
Zhengzhou, HenanAges 18–70 - NCT05092373RecruitingPhase 1
Tumor treating device plus targeted or immune drugs for advanced cancers
This Phase 1 study tests whether a tumor treating fields device works better when added to standard cancer drugs. It may help people with advanced solid tumors in the chest or belly, especially when standard treatment didn’t work or can’t be tolerated.
Houston, TexasAges 18 years+ - NCT05095207RecruitingPhase 1/Phase 2
Abemaciclib and bicalutamide for HER2-negative metastatic breast cancer
This Phase 1/2 trial tests whether combining abemaciclib with bicalutamide can slow or shrink HER2-negative, androgen receptor–positive (AR-positive) metastatic breast cancer. It mainly looks at safety and side effects, and also whether the combination can help patients with this type of breast cancer.
New York, New YorkAges 18–90
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Common questions
- Are there clinical trials for breast cancer?
- Yes. Clin2 currently lists 2,473 recruiting 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 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 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
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.