CancerDrs

Breast Cancer clinical trials

300 actively recruiting breast cancer trials in the United States. The most common cancer in women in the U.S. Clinical trials test new therapies for early-stage, locally advanced, and metastatic breast cancer.

Data from ClinicalTrials.gov · last refreshed · Breast Cancer stats on SEER

53
Phase 1
94
Phase 2
22
Phase 3
7
Phase 4
124
Other

Breast Cancer by the numbers (U.S.)

316,950
Estimated new cases (2025)
42,170
Estimated deaths (2025)
91.7%
5-year relative survival
63
Median age at diagnosis

Source: NCI SEER Cancer Stat Facts

Browse breast cancer trials by state

Top trials by phase + site coverage

Phase 3 Recruiting Academic/Other

Evaluating the Addition of Adjuvant Chemotherapy to Ovarian Function Suppression Plus Endocrine Therapy in Premenopausal Patients With pN0-1, ER-Positive/HER2-Negative Breast Cancer and an Oncotype Recurrence Score Less Than or Equal to 25

This Phase III Trial will determine whether adjuvant chemotherapy (ACT) added to ovarian function suppression (OFS) plus endocrine therapy (ET) is superior to OFS plus ET in improving invasive breast cancer-free survival (IBCFS) among prem…

Sponsor: NRG Oncology
NCT ID: NCT05879926
Locations:
  • University of Alabama at Birmingham Cancer Center — Birmingham, Alabama
  • Anchorage Associates in Radiation Medicine — Anchorage, Alaska
  • Anchorage Radiation Therapy Center — Anchorage, Alaska

+ 1211 more sites in the U.S.

Phase 3 Recruiting Network

S1501 Dual Observational and Randomized Cohort Study of Patients With Metastatic HER-2+ Breast Cancer at Risk of Cardiac Toxicity

This trial has two cohorts of patients with human epidermal growth factor receptor (HER)-2-positive breast cancer that has spread to other places in the body. All patients must be receiving trastuzumab-based treatment. Both cohorts are bei…

Sponsor: SWOG Cancer Research Network
NCT ID: NCT03418961
Locations:
  • Anchorage Associates in Radiation Medicine — Anchorage, Alaska
  • Alaska Breast Care and Surgery LLC — Anchorage, Alaska
  • Alaska Oncology and Hematology LLC — Anchorage, Alaska

+ 574 more sites in the U.S.

Phase 3 Recruiting Academic/Other

E-Mindfulness Approaches for Living After Breast Cancer

NRG-CC015 is a prospective, randomized phase III clinical trial to evaluate the efficacy of two distinct digital approaches for delivering a mindfulness-based intervention: a live, instructor-led version delivered over Zoom (MAPs LO), and …

Sponsor: NRG Oncology
NCT ID: NCT06748222
Locations:
  • Mayo Clinic Hospital in Arizona — Phoenix, Arizona
  • Mercy Hospital Fort Smith — Fort Smith, Arkansas
  • NEA Baptist Memorial Hospital and Fowler Family Cancer Center - Jonesboro — Jonesboro, Arkansas

+ 359 more sites in the U.S.

Phase 3 Recruiting Academic/Other

Testing Longer Duration Radiation Therapy Versus the Usual Radiation Therapy in Patients With Cancer That Has Spread to the Brain

This phase III trial compares the effectiveness of fractionated stereotactic radiosurgery (FSRS) to usual care stereotactic radiosurgery (SRS) in treating patients with cancer that has spread from where it first started to the brain. Radia…

Sponsor: NRG Oncology
NCT ID: NCT06500455
Locations:
  • Banner University Medical Center - Tucson — Tucson, Arizona
  • University of Arizona Cancer Center-North Campus — Tucson, Arizona
  • Mercy Hospital Fort Smith — Fort Smith, Arkansas

+ 259 more sites in the U.S.

Phase 3 Recruiting Industry

An Adjuvant Endocrine-based Therapy Study of Camizestrant (AZD9833) in ER+/HER2- Early Breast Cancer (CAMBRIA-2)

This is a Phase III open-label study to assess if camizestrant improves outcomes compared to standard adjuvant endocrine therapy for patients with ER+/HER2- early breast cancer with intermediate-high or high risk for disease recurrence who…

Sponsor: AstraZeneca
NCT ID: NCT05952557
Locations:
  • Research Site — Dothan, Alabama
  • Research Site — Phoenix, Arizona
  • Research Site — Tucson, Arizona

+ 145 more sites in the U.S.

Phase 3 Recruiting Industry

A Study to Learn About the Study Medicine Called PF-07248144 in Combination With Fulvestrant in People With HR-positive, HER2-negative Advanced or Metastatic Breast Cancer Who Progressed After a Prior Line of Treatment.

The purpose of this study is to learn about the safety and effects of the study medicine PF-07248144 when given along with fulvestrant for the possible treatment of HR-positive, HER2-negative advanced or metastatic breast cancer. HR-positi…

Sponsor: Pfizer
NCT ID: NCT07062965
Locations:
  • Ironwood Cancer & Research Centers — Chandler, Arizona
  • Ironwood Cancer & Research Centers — Gilbert, Arizona
  • Ironwood Cancer & Research Centers — Glendale, Arizona

+ 99 more sites in the U.S.

Phase 3 Recruiting Academic/Other

The CDK4/6 Inhibitor Dosing Knowledge (CDK) Study

The purpose of this study is to generate evidence on an alternative dosing strategy for CDK4/6 inhibitors to help more patients with Metastatic Breast Cancer (MBC) (age ≥ 65 years) tolerate side effects and stay on treatment longer, to der…

Sponsor: American Society of Clinical Oncology
NCT ID: NCT06377852
Locations:
  • Ironwood Cancer & Research Centers — Chandler, Arizona
  • Ironwood Cancer & Research Centers — Gilbert, Arizona
  • Ironwood Cancer & Research Centers — Glendale, Arizona

+ 70 more sites in the U.S.

Phase 3 Recruiting Industry

A Study to Evaluate Efficacy and Safety of Giredestrant Compared With Fulvestrant (Plus a CDK4/6 Inhibitor), in Participants With ER-Positive, HER2-Negative Advanced Breast Cancer Resistant to Adjuvant Endocrine Therapy (pionERA Breast Cancer)

This is a Phase III, randomized, open-label multicenter study that will evaluate the efficacy and safety of giredestrant compared with fulvestrant, both in combination with the investigator's choice of a CDK4/6 inhibitor (palbociclib, ribo…

Sponsor: Hoffmann-La Roche
NCT ID: NCT06065748
Locations:
  • Southern Cancer Center — Daphne, Alabama
  • Sutter Auburn Faith Hospital — Auburn, California
  • La Hematology Oncology Medical Group — Glendale, California

+ 58 more sites in the U.S.

Phase 3 Recruiting Industry

A Clinical Study of Sacituzumab Tirumotecan (Sac-TMT, MK-2870) in People With Breast Cancer (MK-2870-032)

Researchers are looking for new ways to treat types of breast cancer that are both: * High-risk, which means the cancer may have a higher chance of getting worse or coming back after treatment * Early-stage, which means the cancer is in th…

Sponsor: Merck Sharp & Dohme LLC
NCT ID: NCT06966700
Locations:
  • Banner MD Anderson Cancer Center ( Site 0066) — Gilbert, Arizona
  • Mayo Clinic Cancer Center ( Site 0034) — Phoenix, Arizona
  • University of Arizona Cancer Center ( Site 0035) — Tucson, Arizona

+ 57 more sites in the U.S.

Phase 3 Recruiting Industry

ROSETTA Breast-01: The Effects and Safety of Pumitamig in Patients With Triple-Negative Breast Cancer

This is a Phase III trial where participants will be randomized to two treatment groups, which means participants will be assigned by equal chance to a treatment group. This trial will be double-blinded, which means neither the participant…

Sponsor: BioNTech SE
NCT ID: NCT07173751
Locations:
  • Highlands Oncology Group — Springdale, Arkansas
  • University Of California - San Diego Moores Cancer Center — La Jolla, California
  • Cedar Sinai - Samuel Oschin Cancer Center — Los Angeles, California

+ 55 more sites in the U.S.

Phase 3 Recruiting Industry

Saruparib (AZD5305) Plus Camizestrant Compared With CDK4/6 Inhibitor Plus Endocrine Therapy or Plus Camizestrant in HR-Positive, HER2-Negative (IHC 0, 1+, 2+/ ISH Non-amplified), BRCA1, BRCA2, or PALB2m Advanced Breast Cancer

The primary objective of the study is to measure efficacy of saruparib (AZD5305) plus camizestrant compared with physician's choice CDK4/6i plus ET in patients with BRCA1, BRCA2, or PALB2m, HR-positive, HER2-negative (defined as IHC 0, 1+,…

Sponsor: AstraZeneca
NCT ID: NCT06380751
Locations:
  • Research Site — Gilbert, Arizona
  • Research Site — Fountain Valley, California
  • Research Site — Glendale, California

+ 53 more sites in the U.S.

Phase 3 Recruiting Industry

A Study Evaluating the Efficacy and Safety of Inavolisib Plus CDK4/6 Inhibitor and Letrozole vs Placebo + CDK4/6i and Letrozole in Participants With Endocrine-Sensitive PIK3CA-Mutated, Hormone Receptor-Positive, HER2-Negative Advanced Breast Cancer

This study will evaluate the efficacy and safety of the combination of inavolisib plus a cyclin-dependent kinase 4 and 6 inhibitor (CDK4/6i) and letrozole versus placebo plus a CDK4/6i and letrozole in the first-line setting in participant…

Sponsor: Hoffmann-La Roche
NCT ID: NCT06790693
Locations:
  • The Dignity Health Cancer Institute — Phoenix, Arizona
  • Disney Family Cancer Center — Burbank, California
  • Scripps Health — La Jolla, California

+ 51 more sites in the U.S.

Showing 12 of 300 trials. See all on ClinicalTrials.gov

Before you contact a trial site

Trial eligibility criteria are specific and strict. Reading them carefully before calling a site saves time. These guides walk through what to look for.

Medical disclaimer: Information on this page aggregates public ClinicalTrials.gov data. It is not medical advice. Always confirm eligibility and enrollment details with the trial site or your oncologist.

Source: ClinicalTrials.gov API v2 · Last checked: 2026-07-27