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 22 of 26
Narrative Visualization for Breast Cancer Survivors' Physical Activity
The University of Texas Medical Branch, Galveston
NCT03612596
Responsiveness to Acute Changes in Exercise and Relaxation (RACER) Trial
University of Illinois at Urbana-Champaign
NCT03702712
Evaluating Mepitel in Post-mastectomy Patients and the Role of the Skin Microbiome in Radiation Dermatitis
Mayo Clinic
NCT03519438
S-equol in Women With Triple Negative Breast Cancer
The University of Texas Health Science Center at San Antonio
NCT02352025
Thoracoscopic Sentinel Lymph Node Biopsy in Patients With Stage I or Stage II Breast Cancer
University of Miami
NCT00450723
Effect of Increased Light Exposure on Fatigue in Breast Cancer
University of California, San Diego
NCT00478257
Patient-centered Communication About Healthy Weight in Early Breast Cancer
UNC Lineberger Comprehensive Cancer Center
NCT04504201
Yoga Practice for Breast or Ovarian Cancer Patients
Memorial Sloan Kettering Cancer Center
NCT02305498
Pilot Functional Imaging Study to Evaluate Mechanisms Underlying Chronic Pain in Breast Cancer Patients
Lynn Henry
NCT01639417
Paclitaxel and Radiation Therapy in Treating Patients Undergoing Surgery for Stage II or Stage III Breast Cancer
Vanderbilt-Ingram Cancer Center
NCT00647218
Effect of Sukshma Vyayama Yoga on Aromatase Inhibitor-Induced Arthralgia in Breast Cancer Survivors
AshtaYoga
NCT04042870
Bone Response in Metastatic Breast Cancer Involving Bones
M.D. Anderson Cancer Center
NCT00420433
Docetaxel Plus Imatinib Mesylate in Metastatic Breast Cancer
SCRI Development Innovations
NCT00193180
Patient-Assisted Compression in 3D - Impact on Image Quality and Workflow
GE Healthcare
NCT03456427
Exemestane in Treating Postmenopausal Women With Stage IV Breast Cancer
City of Hope Medical Center
NCT00810797
Culturally Aware AET Non-Initiation Intervention
Massachusetts General Hospital
NCT05465408
Effects of Meditation on Cognitive Function and Quality of Life
M.D. Anderson Cancer Center
NCT02162329
Pre-Surgery Positron Emission Mammography in Patients With Newly Diagnosed Breast Cancer
Swedish Medical Center
NCT01241721
Campath-1H + FK506 and Methylprednisolone for GVHD
Case Comprehensive Cancer Center
NCT00109993
Reducing Distress and Depressive-symptoms in Rural Women
University of Nebraska
NCT03465813
Health SMART (Stress Management and Relaxation Training)
Fred Hutchinson Cancer Center
NCT01048528
A Study Of Changes In PD-L1 Expression During Preoperative Treatment With Nab-Paclitaxel And Pembrolizumab In Hormone Receptor-Positive Breast Cancer
Adrienne G. Waks
NCT02999477
Preoperative Accelerated Partial Breast Irradiation (APBI) for Women With Stage I and Select IIA Breast Cancer
University of Maryland, Baltimore
NCT01014715
Healing Touch During Chemotherapy Infusions for Women With Breast Cancer
Stanford University
NCT00533663
Irinotecan and Etoposide in Treating Patients With Recurrent, Locally Advanced, or Metastatic Breast Cancer
University of Arizona
NCT00693719
Study on Physical Activity's Relationship With Cancer and Cognition
University of Nebraska
NCT03980626
Activity & Cognition After Treatment for Breast Cancer
University of Illinois at Urbana-Champaign
NCT02592070
Gefitinib, Trastuzumab, and Docetaxel in Treating Patients With Metastatic Breast Cancer
City of Hope Medical Center
NCT00086957
Preserving Function in Breast Cancer Patients
Dartmouth-Hitchcock Medical Center
NCT00429286
Genistein in Preventing Breast or Endometrial Cancer in Healthy Postmenopausal Women
UNC Lineberger Comprehensive Cancer Center
NCT00099008
Acupuncture in the Management of Post Operative Symptoms in Breast Cancer Patients
Legacy Health System
NCT00419822
Proactive Psychiatry Consultation for Patients With Cancer and Severe Mental Illness
Massachusetts General Hospital
NCT02594696
A Study to Evaluate ONM-100, an Intraoperative Fluorescence Imaging Agent for the Detection of Cancer
OncoNano Medicine
NCT03735680
Mindful Movement in Women Receiving Adjuvant or Neoadjuvant Therapy for Breast Cancer
Washington University School of Medicine
NCT03262831
Peripheral Stem Cell Transplantation With or Without Stromagen Following Chemotherapy in Treating Women With Metastatic Breast Cancer
Roswell Park Cancer Institute
NCT00003877
Mindfulness for Breast Cancer
NYU Langone Health
NCT02647216
Young, Empowered & Strong (YES): The Young Women's Breast Cancer Study 2- Focus on Intervention Pilot
Dana-Farber Cancer Institute
NCT03913936
Study of Ductal Lavage in Women at High Risk for Breast Cancer
University of California, San Francisco
NCT00429988
Emotion Regulation and Cancer Caregiving
Stanford University
NCT06123416
Use of the Contura™ Catheter to Deliver Accelerated Partial Breast Irradiation to "Low-risk" Breast Cancer Patients
Cancer Center of Irvine
NCT00882596
Vinorelbine and XR9576 to Treat Cancer
National Cancer Institute (NCI)
NCT00001944
Sleep Coach: A Mobile App to Address Insomnia Symptoms Among Cancer Survivors
University of Michigan Rogel Cancer Center
NCT04827459
Partial Breast Radiation Therapy in Treating Women Undergoing Breast-Conserving Therapy for Early Stage Breast Cancer
Case Comprehensive Cancer Center
NCT00527293
Clinical Trial of the Combination of Intravenous Alvespimycin (KOS-1022), Trastuzumab With or Without Paclitaxel in Patients With Advanced Solid Tumor Malignancies or Her2 Positive Metastatic Breast Cancer Who Have Previously Failed Trastuzumab Therapy
Bristol-Myers Squibb
NCT00803556
Tamoxifen in the Prevention of Breast Cancer in Hodgkin's Disease Survivors
Dana-Farber Cancer Institute
NCT00165308
Feasibility of an Evidence-based Walking Program in Cancer Pts 60+ During Chemotherapy
UNC Lineberger Comprehensive Cancer Center
NCT01789983
Time Restricted Eating on Cancer Risk
Medical University of South Carolina
NCT05038137
Targeted Pain Coping Skills Training (PCST) for Prevention and Treatment of Persistent Post-Mastectomy Pain
Duke University
NCT02439437
Bioequivalency Study of Letrozole 2.5 mg Tablets Under Fed Conditions
Roxane Laboratories
NCT01367626
A Pilot Observational Study to Assess Changes in Biochemical Parameters of Ovarian Reserve With Chemotherapy
Lynn Henry
NCT00644683
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.