Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Breast Cancer: early-phase trial registry
423 of 1,251 indexed Breast Cancer trials are currently recruiting, with more weight in Phase 1-2.
Corpus placement: #1 of 28,707 conditions by registered trial count.
1,251 US clinical trials · 423 currently recruiting · #1 of 28,707 conditions by registered trial count
Breast Cancer: 1,251 US clinical trials tracked, 423 recruiting.
Breast Cancer is the subject of 1,251 registered US clinical trials on ClinicalTrials.gov, 423 of them currently open to new participants. 120 are in Phase 3-4 (later-stage) and 491 in Phase 1-2 (earlier-stage). The most active sponsor is Memorial Sloan Kettering Cancer Center, running 98 of these trials.
Enrollment posture brief
Registry condition breast-cancer
OPEN 423 | RECR 34% | LATE 120 | EARLY 491 | RANK #1 | SPON 98
Volume-matched condition peers
Nearest open-share peer: Refractory Multiple Myeloma (34% recruiting · 68 trials)
Breast Cancer lists 423 open slots (34% of 1,251 indexed trials). Peers are matched on registered volume, not therapeutic-area browse lists. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Breast Cancer on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Breast Cancer is recruiting below its size-band peers.
423 of 1,251 indexed trials (33.8%) are open to enrollment, against a 37.1% average across 139 conditions with 100+ trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
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Sponsorship of Breast Cancer trials is spread across many organizations.
Memorial Sloan Kettering Cancer Center accounts for 98 of 1,251 trials (7.8%). 367 distinct sponsors appear on at least one study for this condition label.
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Typical Breast Cancer enrolment sits around 90 participants.
Median target enrolment is 90 among the 1,225 trials that report a genuine target (sentinel values excluded). 630 of those (51.4%) plan for fewer than 100 participants.
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Breast Cancer research is mostly interventional.
1,015 interventional and 236 observational studies make up this index (81.1% interventional). Study type is sponsor-reported on ClinicalTrials.gov.
Open and recent trials
1,251 total, page 25 of 26
A Pilot Study of Bone Mineral Density in Postmenopausal Women After Treatment for Breast Cancer
University of Michigan Rogel Cancer Center
NCT00399321
CP-724,714 in Treating Patients With Metastatic Breast Cancer
Jonsson Comprehensive Cancer Center
NCT00055926
A Safety and Immunology Study of a Modified Vaccinia Vaccine for HER-2(+) Metastatic Breast Cancer
Bavarian Nordic
NCT00485277
Intraoperative Evaluation of Axillary Lymphatics
University of Wisconsin, Madison
NCT05094102
Assessing Response to Neoadjuvant Chemotherapy With HD PET/CT, Serum Glycomic Markers and Tissue Muc-1 Isoforms
University of California, Davis
NCT01110174
A Pilot Study of [Ga-68]PSMA PET/MRI for the Assessment of PSMA-positive Tumors
Case Comprehensive Cancer Center
NCT02978586
A Study of High-Dose Vit D Versus Standard of Care Vit D Supplementation
Wake Forest University Health Sciences
NCT05016310
Electronic Medical Record-Based Nudge to Reduce SLNB
University of Pittsburgh Medical Center
NCT06006910
Reducing Metabolic Syndrome Among Breast Cancer Survivors
Barbara Ann Karmanos Cancer Institute
NCT03719677
Engineering Gut Microbiome to Target Breast Cancer
Mayo Clinic
NCT03358511
Visualization of the Effect of Acupuncture on Brain Serotonin in Breast Cancer Survivors
Abramson Cancer Center at Penn Medicine
NCT01018108
Pre-Surgical Qigong Therapy for Women With Breast Cancer
M.D. Anderson Cancer Center
NCT00495209
Heated Chemotherapy for Cancers That Have Spread to the Chest Cavity
St. Luke's-Roosevelt Hospital Center
NCT01163552
A Study of Pre-Operative Treatment With Cryoablation and Immune Therapy in Early Stage Breast Cancer
Memorial Sloan Kettering Cancer Center
NCT02833233
Persistent Post-Surgical Pain in Women With BrCA
University of Florida
NCT02266082
Interleukin-12 in Treating Patients With Metastatic or Recurrent Breast Cancer
Alliance for Clinical Trials in Oncology
NCT00004893
Efficacy and Safety of BMS-690514 in Combination With Letrozole to Treat Metastatic Breast Cancer
Bristol-Myers Squibb
NCT01068704
Koning Breast Computed Tomography Guided Biopsy
Koning Corporation
NCT01750320
Ipsilateral Peripheral Intravenous Access Procedures (The iPIVAP Study)
Duke University
NCT04570722
Gene Therapy in Treating Women With Metastatic Breast Cancer
Max Sung
NCT00849459
Transcranial Direct Current Stimulation (tDCS) to Improve Fatigue and Cognitive Function
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
NCT03487601
Gefitinib With or Without Tamoxifen in Treating Patients With Tamoxifen-Resistant Metastatic Breast Cancer
Dartmouth-Hitchcock Medical Center
NCT00080743
Comparison Study of Breast Computed Tomography (CT) With Magnetic Resonance Imaging (MRI)
Emory University
NCT00957099
Radiation Therapy After Lumpectomy in Treating Women With Ductal Carcinoma in Situ or Invasive Breast Cancer
Case Comprehensive Cancer Center
NCT00054301
Treatment AND Monitoring Patterns AND Clinical Outcomes IN Patients Receiving Palbociclib Combination Treatment (with AI OR Fulvestrant) FOR Hr+/her2- A/mbc IN A Community Oncology Setting.
Pfizer
NCT04498481
Cellular Adoptive Immunotherapy in Treating a Patient Who Has Undergone a Donor Stem Cell Transplant for Breast Cancer That Has Spread to the Lung
National Cancer Institute (NCI)
NCT00301730
Gabapentin For the Control of Hot Flashes in Women With Breast Cancer
Gary Morrow
NCT00022074
Vaccine Therapy Plus Sargramostim in Treating Patients With Stage III or Stage IV Cancer
University of Washington
NCT00005023
Liposomal Doxorubicin and Trastuzumab in Treating Women With Advanced Breast Cancer
NYU Langone Health
NCT00006825
Allogeneic Peripheral Stem Cell Transplantation in Treating Patients With Stage IV Breast Cancer
National Cancer Institute (NCI)
NCT00020176
Chemotherapy in Treating Women With Metastatic Breast Cancer
Daiichi Sankyo
NCT00004046
Docetaxel Plus Garlic in Treating Patients With Locally Advanced or Metastatic Breast Cancer
National Cancer Institute (NCI)
NCT00079170
Effect of Lifestyle Factors and Hormone Function on Breast Density in Healthy Hispanic Women Who Are Undergoing Mammography for Breast Cancer Screening
National Cancer Institute (NCI)
NCT00131950
BMS-247550 in Treating Women With Metastatic Breast Cancer
Memorial Sloan Kettering Cancer Center
NCT00020904
Stress Reduction in Older Women With Stage II, Stage III, or Stage IV Breast Cancer
Unity Health Toronto
NCT00006346
Ravuconazole in Preventing Fungal Infections in Patients Undergoing Allogeneic Stem Cell Transplantation
National Institutes of Health Clinical Center (CC)
NCT00064311
Octreotide, Tamoxifen, and Chemotherapy in Treating Women With Breast Cancer
NSABP Foundation
NCT00002967
Erlotinib in Treating Patients With Locally Advanced or Metastatic Breast Cancer
National Cancer Institute (NCI)
NCT00030537
Raloxifene in Preventing Breast Cancer in Premenopausal Women
National Cancer Institute (NCI)
NCT00019500
Interleukin-12 in Treating Patients With Hematologic Cancers or Solid Tumors
Indiana University School of Medicine
NCT00003107
Docetaxel and Flavopiridol in Treating Patients With Locally Advanced or Metastatic Breast Cancer
National Cancer Institute (NCI)
NCT00020332
Radiolabeled Monoclonal Antibody Therapy Followed by Bone Marrow or Peripheral Stem Cell Transplantation in Treating Patients With Metastatic Breast Cancer
Cancer Research Institute of Contra Costa
NCT00007891
Paclitaxel With or Without Gemcitabine in Treating Women With Advanced Breast Cancer
Eli Lilly and Company
NCT00006459
Tipifarnib Plus Tamoxifen in Treating Women With Metastatic Breast Cancer
National Cancer Institute (NCI)
NCT00052728
Combination Chemotherapy and Peripheral Stem Cell Transplantation in Treating Women With Metastatic Breast Cancer
Hackensack Meridian Health
NCT00004906
HER-2 Protein Vaccine in Treating Women With Breast Cancer
Case Comprehensive Cancer Center
NCT00068614
Combination Chemotherapy With Suramin Plus Doxorubicin in Treating Patients With Advanced Solid Tumors
Mayo Clinic
NCT00003038
Radiation Therapy in Treating Women With Stage I or Stage II Breast Cancer
Radiation Therapy Oncology Group
NCT00002873
Tamoxifen Compared With LY353381 in Treating Women With Newly Diagnosed Breast Cancer
University of Kansas Medical Center
NCT00005886
Paclitaxel or Docetaxel in Treating Women With Advanced Breast Cancer
Aventis Pharmaceuticals
NCT00002662
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 235 |
| Phase 2 | 256 |
| Phase 3 | 100 |
| Phase 4 | 20 |
Top Sponsors
Named interventions
Most-linked intervention names on Breast Cancer records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Breast Cancer trials. A trial with sites in several states counts in each.
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
Related
What to do with this Breast Cancer page
1,251 registered trials, 423 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 423 Breast Cancer trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- Memorial Sloan Kettering Cancer Center sponsors the most Breast Cancer trials on record, review their full trial history before evaluating a specific study. See Memorial Sloan Kettering Cancer Center's trials
- Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide
Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Breast Cancer condition card totals 1,251 registered trials; most-linked intervention Fulvestrant; top US site state California. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.