Clinical trials
Breast cancer clinical trials
Cancer that forms in the cells of the breast, the most common cancer in women. We’re tracking 2,417 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05372640RecruitingPhase 1
Drug combo trial for rare cancers with shared NUT features
This Phase 1 trial tests the safety and early signs of effectiveness of combining two anti-cancer drugs (ZEN003694 and abemaciclib) in teens and adults with metastatic or unresectable NUT carcinoma, breast cancer, and other solid tumors. It may help by finding a safer dose and whether the drug combination can shrink or control tumors that do not respond to standard treatments.
Los Angeles, CaliforniaAges 12 years+ - NCT05366881Recruiting
Blood test study to spot early cancer signal and cancer leftovers
This observational study checks whether a blood test (a “cfDNA” test) can detect early signs of cancer or small amounts of cancer left after treatment. It may help doctors use a simple blood sample to improve cancer detection and follow-up.
Duarte, CaliforniaAges 40 years+ - NCT05377996RecruitingPhase 1/Phase 2
Study drug for advanced solid tumors with tumor tissue testing
This early-stage study tests emiltatug leda-dotin (Emi-Le) in people with advanced or recurring solid cancers. It aims to see how the drug works and how safely it can be given, using tumor tissue testing to help understand who may benefit.
Phoenix, ArizonaAges 18 years+ - NCT05377047RecruitingPhase 3
High-precision radiation for limited breast cancer spread
This trial tests a high-precision radiation therapy (called stereotactic ablative radiotherapy) to treat breast cancer that has spread to a limited number of spots in the body. It aims to control the cancer and improve outcomes, and you can join while on your first-line systemic treatment if the cancer is stable.
CorkAges 18 years+ - NCT05412225RecruitingPhase 1
Pre-surgery radiation, then mastectomy and immediate breast reconstruction
This Phase 1 study looks at giving radiation before surgery for people with locally advanced breast cancer, then performing a mastectomy and immediate reconstruction. It aims to see whether this combined approach can shrink the cancer before surgery and safely allow reconstruction afterward.
Basking Ridge, New JerseyAges 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+ - 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+ - NCT01840293Recruiting
Breast cancer study using tumor tissue to find key differences
This trial looks at breast cancer “proteins” and molecular features using tumor samples taken during surgery or biopsy. The goal is to better understand why breast cancers behave differently, which may help guide more personalized treatment in the future.
CorkAges 18 years+ - NCT05327608Recruiting
Time-restricted eating during chemo before breast cancer surgery
This study tests whether eating only during a certain window of time each day (time-restricted eating) can improve outcomes for people with early-stage breast cancer who are getting chemotherapy before surgery. It may help with treatment side effects and overall health.
Cherry Hill, New JerseyAges 18 years+ - NCT05334069Recruiting
Blood test study for early cancer detection in patients
This study collects blood from people with cancer and people without cancer (or with possible cancer) to test whether new blood tests can detect cancer earlier. Your blood samples help researchers evaluate how well these tests work.
Anchorage, AlaskaAges 40–75 - NCT05313191Recruiting
Proton therapy for tumors after prior radiation
This study looks at whether a type of proton beam treatment can be given safely and effectively to tumors that have already been treated with radiation before. It may help people whose tumors came back or persisted after earlier radiation, using a specific proton method called pencil beam scanning.
New York, New YorkAges 18 years+ - NCT05350722Recruiting
Single pre-surgery radiation for low-risk breast cancer
This trial tests a single, shorter course of radiation given before breast surgery for people with low-risk, hormone-receptor–positive breast cancer. It may help treat the breast tumor while reducing the number and length of radiation treatments.
SydneyAges 40 years+ - NCT05305924RecruitingPhase 2
Fulvestrant plus abemaciclib for ER+, HER2− advanced breast cancer
This Phase 2 study tests whether adding abemaciclib to fulvestrant can slow or shrink ER-positive, HER2-negative metastatic breast cancer. It is mainly for people whose cancer has progressed despite prior treatment with a CDK4/6 inhibitor and an aromatase inhibitor.
Houston, TexasAges 18 years+ - NCT05269381RecruitingPhase 1/Phase 2
Personalized cancer vaccine with pembrolizumab for advanced solid tumors
This trial tests a personalized vaccine made from your tumor's unique markers, combined with the drug pembrolizumab, to help your immune system fight cancer. It is for people with advanced solid tumors who have already tried standard treatments.
Jacksonville, FloridaAges 16 years+ - NCT05301881RecruitingPhase 2
Continuing current treatment after local treatment for limited cancer growth
This trial tests whether continuing your current therapy after getting local treatment (like surgery or radiation) for a small area of cancer growth is safe and effective. It may help you keep the same treatment longer before switching to a new one.
AlkmaarAges 18 years+ - NCT05304962RecruitingPhase 1
Test drug RGT-419B for advanced ER+ HER2- breast cancer
This Phase 1 study tests a new drug (RGT-419B), given alone or with hormone (endocrine) therapy, in people with advanced ER-positive, HER2-negative breast cancer that has progressed after standard treatments. It looks mainly at safety and early signs of how well the treatment may work.
La Jolla, CaliforniaAges 18 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+ - 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 - NCT05142033Recruiting
Cancer or precancer testing using DNA sequencing results
This trial helps doctors study and analyze cancer- or precancer-related DNA information. If you’re 18 or older and can consent, your results may help researchers understand the biology of your condition and guide future care.
Marshall, MinnesotaAges 18 years+ - NCT04636710Recruiting
Treatment approach study for stage III inflammatory breast cancer
This study looks at how to best plan local treatments (like surgery and/or radiation) for people with stage III inflammatory breast cancer. It may help doctors refine care plans for this aggressive subtype by studying how patients are treated and what outcomes they have.
Boston, MassachusettsAges 18 years+ - 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+ - NCT05115474RecruitingPhase 2
Screening brain MRI study for stage IV breast cancer
This trial checks whether taking screening brain MRI scans in people with stage IV breast cancer helps find brain involvement earlier. It may help guide treatment decisions for those who would otherwise only get brain imaging after symptoms start.
Clearwater, FloridaAges 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 - NCT05072314RecruitingPhase 3
Lidocaine drip after breast surgery to improve long-term pain
This Phase 3 study tests whether a long-running lidocaine (a numbing medicine) drip given around the time of breast surgery can improve long-term post-surgery pain and recovery. It may help people who have pain after mastectomy or breast-conserving surgery.
Kingswood, New South WalesAges 18 years+
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Common questions
- Are there clinical trials for breast cancer?
- Yes. Clin2 currently lists 2,417 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.