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 21 of 26
Study of the Safety and Pharmacology of GDC-0980 in Combination With Paclitaxel With or Without Bevacizumab in Patients With Locally Recurrent or Metastatic Breast Cancer
Genentech
NCT01254526
Study of Barriers to Beginning and Finishing Treatment for Patients With Breast Cancer
City of Hope Medical Center
NCT00937989
Sentinel Lymph Node Mapping Post-Injection Site Pain
University of California, San Diego
NCT02065232
Using Technology to Improve Physical Activity Levels Among Postmenopausal Women (The Active & Aware Study)
University of California, San Diego
NCT01837147
Effect of Healing Touch on the Experience of Women Undergoing Treatment for Breast Cancer
Stanford University
NCT00533780
Psychosocial Outcomes in Online Cancer Support Groups
Christiana Care Health Services
NCT00382785
Randomized Phase II Trial Induction Therapy for Early Stage Breast Cancer
Emory University
NCT00209092
ABI-007 (Nab-Paclitaxel) and Gemcitabine in Treating Women With Metastatic Breast Cancer
Mayo Clinic
NCT00110084
S1008: Exercise, Diet, & Counseling in Improving Weight Loss in Overweight Female Breast or Colorectal Cancer Survivors
SWOG Cancer Research Network
NCT01453452
Imaging Markers of Subclinical Cardiotoxicity in Breast Cancer
Beth Israel Deaconess Medical Center
NCT02666378
Acupressure for Aromatase Inhibitor-Associated Musculoskeletal Symptoms in Patients With Breast Cancer
University of Michigan Rogel Cancer Center
NCT06228768
Effects of Tibilone on Bone Density, Menopause Symptoms and Breast Density in Women After Prophylactic Oophorectomy
Dana-Farber Cancer Institute
NCT00165204
Computed Optical Margin Assessment for Breast Cancer Surgery, Phase I (Part A)
Diagnostic Photonics
NCT01699867
Intellectual Impairment in Women With Breast Cancer
Stanford University
NCT00896324
Pilot Study to Evaluate the Effect of Aromatase Inhibitor Therapy on Pain Threshold in Breast Cancer Patients
University of Michigan Rogel Cancer Center
NCT01814397
Therapy to Prevent Sexual Pain in Breast Cancer Survivors
OHSU Knight Cancer Institute
NCT01539317
Physical Activity, Fatigue, Sleep, and Inflammation
University of Alabama at Birmingham
NCT01147367
An Exercise Intervention for Breast Cancer Patients: Feasibility and Effectiveness (BEAT Cancer Trial; Pilot Study)
University of Alabama at Birmingham
NCT00721565
Bioequivalency Study of Exemestane 25 mg Tablet Under Fasted Conditions
Roxane Laboratories
NCT01331421
Dose Dense Carboplatin, Taxotere and Herceptin As Primary Systemic Therapy in Breast Cancer
University of Miami
NCT00232479
A Study to Evaluate the Safety and Tolerability of Immunotherapy Combinations in Participants With Advanced Malignancies
Arcus Biosciences
NCT03629756
Docetaxel Alone or in Combination With Vaccine to Treat Breast Cancer
National Cancer Institute (NCI)
NCT00179309
A Comparison of Dermal Autograft to AlloDerm in Breast Reconstruction
University of Kentucky
NCT01561287
A Study of CDX-1307, in Patients With Incurable Breast, Colorectal, Pancreatic, Ovarian or Bladder Cancer (CDX 1307-01)
Celldex Therapeutics
NCT00709462
Stay on Track: A Study of Exercise Effects During Radiation
Medical College of Wisconsin
NCT03243786
Bioequivalency Study of Exemestane 25 mg Tablet Under Fed Conditions
Roxane Laboratories
NCT01331434
Multi-Omics Study of the Effect and Mechanisms of Acupuncture on Psychoneurological Symptoms Among Breast Cancer Survivors
University of Illinois at Chicago
NCT05417451
A "Window Trial" on Boswellia for Breast Cancer Primary Tumors
Medical University of South Carolina
NCT03149081
Computerized Cognitive Training in Breast Cancer Survivors
Ohio State University
NCT05570604
Trastuzumab Plus Docetaxel in Treating Women With Recurrent or Metastatic Breast Cancer
Vanderbilt-Ingram Cancer Center
NCT00006104
Initial Assessment of an Internet-based Symptom Management Intervention in Early Stage Breast Cancer
University of Michigan
NCT02495155
Vaccine Therapy in Treating Patients With Breast Cancer
Memorial Sloan Kettering Cancer Center
NCT00004156
Healing Touch in Treating Fatigue in Women Undergoing Radiation Therapy for Breast Cancer
Vanderbilt-Ingram Cancer Center
NCT00574145
Educational Intervention for Reducing Work Disability in Breast Cancer Survivors
University of Wisconsin, Madison
NCT01799031
Promoting Resilience in Women With Breast Cancer
University of Alabama at Birmingham
NCT06133348
A Study of GDC-0927 in Postmenopausal Women With Locally Advanced or Metastatic Estrogen Receptor Positive Breast Cancer
Genentech
NCT02316509
A Study of LY573636-sodium in Patients With Metastatic Breast Cancer
Eli Lilly and Company
NCT00992225
Bevacizumab and Letrozole in Treating Postmenopausal Women With Locally Advanced or Metastatic Breast Cancer That Cannot Be Removed By Surgery
University of California, San Francisco
NCT00305825
Study of XL147 (SAR245408) in Combination With Trastuzumab or Paclitaxel and Trastuzumab in Subjects With Metastatic Breast Cancer Who Have Progressed on a Previous Trastuzumab-based Regimen
Sanofi
NCT01042925
Lapatinib in Treating Patients With Advanced or Metastatic Breast Cancer That Overexpresses HER2
University of California, San Francisco
NCT00544804
Chemotherapy and Stem Cell Transplantation in Treating Patients With Stage IIIB Breast Cancer
City of Hope Medical Center
NCT00003042
First-in-Human Study of RLY-5836 in Advanced Breast Cancer and Other Solid Tumors
Relay Therapeutics
NCT05759949
Ultrasound and Near Infrared Imaging for Predicting and Monitoring Neoadjuvant Treatment
Washington University School of Medicine
NCT02891681
Partial Breast Irradiation Using Non Invasive Approach for Early Stage Breast Cancer
Jaroslaw Hepel
NCT01463007
Cyclophosphamide Plus Vaccine Therapy in Treating Patients With Advanced Cancer
St. Vincent Medical Center - Los Angeles
NCT00002475
An Examination of Predictors of Indicators of Response to Letrozole 2.5 mg
University of Kansas
NCT00291109
Doxorubicin and Paclitaxel in Treating Women With Locally Advanced Breast Cancer
Georgetown University
NCT00003035
e-CHEC-uP: Scaling up an Efficacious Cancer Screening Intervention for Women With Limited English
Johns Hopkins University
NCT03726619
Sentinel Lymph Node Biopsy Findings in Patients With Breast Cancer
Kettering Health Network
NCT02287675
The Women's Healthy Lifestyle Study
University of Michigan
NCT00583726
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.