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Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted.

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Updates regarding government operating status and resumption of normal operations can be found at opm.gov.

Breast Cancer Clinical Trials

Review the breast cancer clinical trials on this list and use the filters to refine the results by age and location. Some clinical trials are held at NCI-Designated Cancer Centers and may be supported by other organizations.

You can find more information about the types and phases of clinical trials and what to expect or use our Steps to Find a Clinical Trial.

Trials 1-25 of 898

Testing the Addition of Chemotherapy to the Usual Treatment of Ovarian Function Suppression plus Hormonal Therapy in Premenopausal ER-Positive/HER2-Negative Breast Cancer Patients Who Are At High Risk of Cancer Returning, OFSET Trial
Status: Active
Location: 1128 locations
Shorter Chemo-Immunotherapy Without Anthracycline Drugs for Early Triple Negative Breast Cancer
Status: Active
Location: 952 locations
Pembrolizumab versus Observation in Patients with Early Stage Triple-Negative Breast Cancer who had a Pathologic Complete Response after Chemotherapy plus Pembrolizumab, OptimICE-PCR Trial
Status: Active
Location: 771 locations
Testing the Usual Treatment of Radiation Therapy and Hormonal Therapy to Hormonal Therapy alone for Low-Risk, Early Stage Breast Cancer, the DEBRA Trial
Status: Active
Location: 758 locations
Testing Low Dose Tamoxifen for Invasive Breast Cancer, LoTam Trial
Status: Active
Location: 607 locations
Adding an Immunotherapy Drug, MEDI4736 (durvalumab), to the Usual Chemotherapy Treatment (Paclitaxel, Cyclophosphamide, and Doxorubicin) for Stage II-III Breast Cancer
Status: Active
Location: 504 locations
Regional Radiation Therapy with or without Whole Breast Irradiation in Treating Patients with Estrogen Receptor Positive, HER2 Negative Low Risk Breast Cancer Who Have Undergone Breast Conserving Surgery or Mastectomy
Status: Active
Location: 379 locations
Testing Longer Duration Radiation Therapy Versus the Usual Radiation Therapy in Patients with Cancer That Has Spread to the Brain
Status: Active
Location: 225 locations
ShortStop-HER2: 12 months vs. 6 months of HER2-targeted Medications for People with HER2+ Breast Cancer who Had a Pathologic Complete Response after Chemotherapy Plus Trastuzumab
Status: Active
Location: 234 locations
Testing Proton Craniospinal Radiation Therapy Versus the Usual Radiation Therapy for Leptomeningeal Metastasis, RADIATE-LM Trial
Status: Active
Location: 56 locations
A Study of Imlunestrant Versus Standard Endocrine Therapy in Participants With Early Breast Cancer
Status: Active
Location: 57 locations
An Adjuvant Endocrine-based Therapy Study of Camizestrant (AZD9833) in ER+/HER2- Early Breast Cancer (CAMBRIA-2)
Status: Active
Location: 43 locations
Hormonal Therapy after Pertuzumab and Trastuzumab for the Treatment of Hormone Receptor Positive, HER2 Positive Breast Cancer, the ADEPT study
Status: Active
Location: 41 locations
Study of Sacituzumab Govitecan-hziy and Pembrolizumab Versus Treatment of Physician's Choice in Patients With Triple Negative Breast Cancer Who Have Residual Invasive Disease After Surgery and Neoadjuvant Therapy (ASCENT-05/AFT-65 OptimICE-RD/GBG 119/NSABP B-63)
Status: Active
Location: 43 locations
A Study of Elacestrant Versus Standard Endocrine Therapy in Women and Men With ER+,HER2-, Early Breast Cancer With High Risk of Recurrence
Status: Active
Location: 42 locations
DNA-guided Second Line Adjuvant Therapy for High Residual Risk, Estrogen Receptor Positive, HER-2 Negative Breast Cancer (DARE)
Status: Active
Location: 33 locations
Phase 3 Study to Evaluate the Efficacy and Safety of HER2/Neu Peptide GLSI-100 (GP2 + GM-CSF) in HER2/Neu Positive Subjects
Status: Active
Location: 32 locations
Trastuzumab Emtansine Followed by Trastuzumab versus Paclitaxel in Combination with Trastuzumab for the Treatment of HER2-Positive Stage I Breast Cancer, ATEMPT 2.0 Trial
Status: Active
Location: 32 locations
I-SPY TRIAL: Neoadjuvant and Personalized Adaptive Novel Agents to Treat Breast Cancer
Status: Active
Location: 33 locations
Testing the Addition of an Individualized Vaccine to Durvalumab and Tremelimumab and Chemotherapy in Patients with Metastatic Triple Negative Breast Cancer
Status: Active
Location: 28 locations
A Study Comparing the Efficacy and Safety of Zanidatamab to Trastuzumab, Each in Combination With Physician's Choice Chemotherapy, for the Treatment of Participants With Metastatic HER2-positive Breast Cancer
Status: Active
Location: 28 locations
A Study of Alisertib in Combination With Endocrine Therapy in Patients With HR-positive, HER2-negative Recurrent or Metastatic Breast Cancer
Status: Active
Location: 26 locations
The CDK4/6 Inhibitor Dosing Knowledge (CDK) Study
Status: Active
Location: 24 locations
Capivasertib + CDK4/6i + Fulvestrant for Advanced/Metastatic HR+/HER2- Breast Cancer (CAPItello-292)
Status: Active
Location: 24 locations
Evaluation of Lasofoxifene Combined With Abemaciclib Compared With Fulvestrant Combined With Abemaciclib in Locally Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation
Status: Active
Location: 21 locations