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 28,963 conditions by registered trial count.
1,251 US clinical trials · 423 currently recruiting · #1 of 28,963 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.
Open enrollment, early-phase tilt
Breast Cancer has 1,251 registered US clinical trials, 423 of them open to new participants right now, about 34% of the total.
- 423
- recruiting participants now
- 34%
- of trials open to enrollment
- 120
- in Phase 3-4 (later-stage)
- 98
- top sponsor: Memorial Sloan Kettering Cancer Center
Corpus placement: #1 of 28,963 conditions by registered trial count on ClinicalTrials.gov-derived indexes. Registry reference only, not medical advice.
Key findings
What ClinicalTrials.gov does not surface for Breast Cancer on its own pages , computed from the registry mirror as of 2026-07-11. Each line carries its own denominator so it can be quoted as it stands.
-
Breast Cancer is recruiting below its size-band peers.
423 of 1,251 indexed trials (33.8%) are open to enrollment, against a 37.2% average across 135 conditions with 100+ trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
-
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.
-
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.
-
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.
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 235 |
| Phase 2 | 256 |
| Phase 3 | 100 |
| Phase 4 | 20 |
Top Sponsors
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
What is open for Breast Cancer right now
423 recruiting of 1,251 indexed (34% open).
Phase mix: 120 late (III/IV) vs 491 early (I/II) (early-phase heavy).
Top sponsor: Memorial Sloan Kettering Cancer Center (98 trials), 9 others listed. 1 shown below, recruiting first. #1 of 28,963 conditions by registered trial count.
How open-enrollment share is computed
Open share is recruiting_count divided by trial_count for this condition label in the public registry export. Status can change between pulls; treat the figure as a snapshot of research attention, not treatment availability.
Frequently Asked Questions
How many clinical trials are there for Breast Cancer?
PlainTrial tracks 1,251 US clinical trials for Breast Cancer, of which 423 are currently recruiting participants. Data sourced from ClinicalTrials.gov.
How do I find a recruiting trial for Breast Cancer?
Use the trial list above filtered by "Recruiting" status, or visit our trial finder at /recruiting to search by condition and state. Always discuss trial participation with your healthcare provider before enrolling.
Is this data current?
Data is sourced from ClinicalTrials.gov and reflects our most recent data pull. Trial status may have changed since then. Always verify current information at ClinicalTrials.gov before making decisions about participation.
Related
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from ClinicalTrials.gov (National Library of Medicine). Consult a qualified professional before making decisions based on this data.
Read our methodology - how this data is sourced, computed, and verified.
Source: ClinicalTrials.gov (NIH/NLM) ClinicalTrials.gov AACT registry · 2026 Trial counts and statuses sourced from ClinicalTrials.gov. Sponsor counts include both industry and federal/academic sponsors.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This page aggregates every registered trial for this condition, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.