Stage I Breast Cancer Clinical Trials

47 recruitingLast updated: June 17, 2026

There are 47 actively recruiting stage i breast cancer clinical trials across 7 countries. Studies span Not Applicable, Phase 2, Phase 3, Early Phase 1, Phase 4, Phase 1. Top locations include Columbus, Ohio, United States, Atlanta, Georgia, United States, Houston, Texas, United States. Updated daily from ClinicalTrials.gov.


Stage I Breast Cancer Trials at a Glance

47 actively recruiting trials for stage i breast cancer are listed on ClinicalTrialsFinder across 6 cities in 7 countries. The largest study group is Not Applicable with 17 trials, with the heaviest enrollment activity in Columbus, Atlanta, and Houston. Lead sponsors running stage i breast cancer studies include Mayo Clinic, Emory University, and City of Hope Medical Center.

Browse stage i breast cancer trials by phase

Treatments under study

About Stage I Breast Cancer Clinical Trials

Looking for clinical trials for Stage I Breast Cancer? There are currently 6 studies actively recruiting participants. Clinical trials offer access to new treatments before they are widely available, and every approved therapy in use today was first tested through a clinical trial.

Below you can browse trials, sign up for alerts when new Stage I Breast Cancer trials open, and view eligibility criteria for each study. Each listing includes the study phase, locations, and enrollment details.

Frequently Asked Questions

Common questions about Stage I Breast Cancer clinical trials

A clinical trial is a carefully designed research study that tests new medical treatments, drugs, devices, or approaches in human volunteers. Every approved medication and treatment available today was proven safe and effective through clinical trials.

All clinical trials are reviewed and approved by Institutional Review Boards (IRBs) — independent committees that evaluate patient safety. Trials follow strict protocols, and your health is monitored closely throughout. You can withdraw at any time.

Not necessarily. Many trials compare the new treatment against the current standard of care, meaning all participants receive active treatment. When placebos are used, they are typically combined with standard treatment, not given alone. The trial description will always specify the design.

Under the Affordable Care Act, most private insurers are required to cover routine patient care costs during a clinical trial. The sponsor typically covers the investigational treatment itself. Medicare also covers routine costs for qualifying trials.

Yes. Participation is completely voluntary. You can withdraw at any time, for any reason, without it affecting your access to standard medical care.

Each trial has specific eligibility criteria — including age, diagnosis, disease stage, prior treatments, and general health. Browse the trials listed above and check their eligibility sections. You can also contact the trial site directly to discuss your situation.

Showing 120 of 47 trials

Recruiting

Immune Response to Anti-HER2 Therapies in Patients With HER2-Positive Stage I-IV Breast Cancer

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage IV Breast Cancer AJCC v8+3 more
Mayo Clinic230 enrolled1 locationNCT04517838
Recruiting
Not Applicable

Personalized Exercise Program for Survivors of Breast Cancer, STEPS-BC Trial

Breast CarcinomaAnatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8+3 more
Wake Forest University Health Sciences120 enrolled2 locationsNCT07474090
Recruiting
Not Applicable

Breast Cancer, Reasoning, and Activity Intervention

Breast CancerBreast NeoplasmsAnatomic Stage II Breast Cancer AJCC v8+3 more
Mayo Clinic160 enrolled1 locationNCT04816006
Recruiting
Phase 3

Metformin for the Treatment of Insulin Resistance in Women With Stage I-III Breast Cancer Completing Chemotherapy

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage I Breast Cancer AJCC v8+1 more
City of Hope Medical Center80 enrolled3 locationsNCT06763328
Recruiting
Phase 3

ShortStop-HER2: 12 Months vs. 6 Months of HER2-targeted Medications for People With HER2+ Breast Cancer Who Had a Pathologic Complete Response After Chemotherapy Plus Trastuzumab

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage I Breast Cancer AJCC v8Early-stage HER2+ Breast Cancer
Alliance for Clinical Trials in Oncology1,524 enrolled656 locationsNCT06876714
Recruiting

Collecting Blood Samples From Patients With and Without Cancer to Evaluate Tests for Early Cancer Detection

Head and Neck CarcinomaMalignant Solid NeoplasmSarcoma+59 more
Alliance for Clinical Trials in Oncology2,000 enrolled746 locationsNCT05334069
Recruiting

Breast Cancer Survivorship Biorepository

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage I Breast Cancer AJCC v8+1 more
University of Southern California1,300 enrolled1 locationNCT05786664
Recruiting

Social Health, Activity Behaviors, and Quality of Life Among Young Adult Cancer Survivors

Malignant Brain NeoplasmMalignant Solid NeoplasmMalignant Testicular Neoplasm+97 more
University of Southern California250 enrolled2 locationsNCT07259304
Recruiting

Enhancing Skin Appearance and Quality of Life in Breast Cancer Survivors on Aromatase Inhibitor Therapy

Estrogen Receptor-Positive Breast CarcinomaAnatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8+4 more
Mayo Clinic35 enrolled1 locationNCT06401889
Recruiting
Phase 2

Concurrent WOKVAC Vaccination, Chemotherapy, and HER2-Targeted Monoclonal Antibody Therapy Before Surgery for the Treatment of Patients With Breast Cancer

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage I Breast Cancer AJCC v8
University of Washington25 enrolled1 locationNCT04329065
Recruiting
Phase 3

Testing Laser Therapy for Treatment of Vaginal Dryness in Survivors of Breast Cancer, The Revitalize Trial

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage 0 Breast Cancer AJCC v8+9 more
Alliance for Clinical Trials in Oncology250 enrolled2 locationsNCT05379153
Recruiting
Phase 2

High Cannabidiol Plant Extract (BRC-001) to Improve Aromatase Inhibitor-Induced Arthralgia in Women With Breast Cancer

Estrogen Receptor-Positive Breast CarcinomaAnatomic Stage II Breast Cancer AJCC v8Anatomic Stage 0 Breast Cancer AJCC v8+5 more
City of Hope Medical Center36 enrolled1 locationNCT06538389
Recruiting
Phase 2

A Dietary Supplement (Resistant Potato Starch) for Reducing Musculoskeletal Symptoms in Individuals Planning to Receive Aromatase Inhibitor Therapy, AIMSS-RPS Trial

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage 0 Breast Cancer AJCC v8+2 more
University of Michigan Rogel Cancer Center20 enrolled1 locationNCT07443943
Recruiting
Phase 3

De-Escalation of Breast Radiation Trial for Hormone Sensitive, HER-2 Negative, Oncotype Recurrence Score Less Than or Equal to 18 Breast Cancer (DEBRA)

Stage I Breast Cancer
NRG Oncology1,670 enrolled832 locationsNCT04852887
Recruiting
Not Applicable

TeleHealth Resistance Exercise Intervention to Preserve Dose Intensity and Vitality in Elder Breast Cancer Patients

Breast CancerBreast Cancer FemaleStage III Breast Cancer+2 more
Dana-Farber Cancer Institute270 enrolled3 locationsNCT05535192
Recruiting
Phase 2

Dose-Reduced Docetaxel With Cyclophosphamide for the Treatment of Vulnerable Older Women With Stage I-III HER2 Negative Breast Cancer, the DOROTHY Trial

HER2-Negative Breast CarcinomaAnatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8+1 more
City of Hope Medical Center174 enrolled3 locationsNCT06042569
Recruiting
Not Applicable

Decision Making Tool in Supporting Decision Making in Contralateral Prophylactic Mastectomy in Patients With Newly Diagnosed Breast Cancer

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage I Breast Cancer AJCC v8+20 more
M.D. Anderson Cancer Center15 enrolled1 locationNCT02918474
Recruiting

Evaluating the Association Among Changes in Gut Microbiome, Fatigue, and Chemotherapy-Induced Nausea in Early Stage Breast Cancer

Anatomic Stage II Breast Cancer AJCC v8Early Stage Breast CarcinomaAnatomic Stage I Breast Cancer AJCC v8+1 more
Mayo Clinic70 enrolled5 locationsNCT05417867
Recruiting
Not Applicable

Improving Exercise Capacity With a Tailored Physical Activity Intervention

Stage III Breast CancerQuality of LifeHodgkin Lymphoma+4 more
Wake Forest University Health Sciences110 enrolled2 locationsNCT05595577
Recruiting
Early Phase 1

Topical or Oral Minoxidil for the Treatment of Endocrine Therapy-Induced Alopecia in Patients With Stage I-IV Breast Cancer

Anatomic Stage II Breast Cancer AJCC v8Anatomic Stage III Breast Cancer AJCC v8Anatomic Stage IV Breast Cancer AJCC v8+20 more
Ohio State University Comprehensive Cancer Center50 enrolled1 locationNCT05417308