14 Breast Cancer Clinical Trials in San Diego, CA (2026)

Q: How do I join a clinical trial in San Diego?

Browse available studies, click one that interests you, and complete the free eligibility form. A study coordinator at the San Diego research site will contact you.

Recruiting Breast Cancer Studies in San Diego

NCT06934239Recruiting

A Trial Comparing Screening Mammography With and Without Assistance From Artificial Intelligence for Breast Cancer Detection and Recall Rates in Adult Patients

The goal of this clinical trial is to compare patient-centered outcomes when screening digital breast tomosynthesis (DBT) exams are interpreted with versus without a leading FDA-cleared artificial int...

San Diego, CAPHASE4400,000 participantsJonsson Comprehensive Cancer Center

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NCT02620852Recruiting

Women Informed to Screen Depending on Measures of Risk (Wisdom Study)

Most physicians still use a one-size-fits-all approach to breast screening in which all women, regardless of their personal history, family history or genetics (except BRCA carriers) are recommended t...

San Diego, CANA100,000 participantsUniversity of California, San Francisco

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NCT06757634Recruiting

Phase 3 Study of Gedatolisib as First-Line Treatment for Patients With HR-Positive, HER2-Negative Advanced Breast Cancer (VIKTORIA-2)

This is a Phase 3, open-label, randomized, clinical trial evaluating the efficacy and safety of gedatolisib plus fulvestrant and CDK4/6 Inhibitors for the treatment of patients with locally advanced o...

San Diego, CAPHASE31,180 participantsCelcuity Inc

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NCT05150691Recruiting

A Phase 1/2a Study of DB-1303/BNT323 in Advanced/Metastatic Solid Tumors

This is a dose-escalation and dose-expansion Phase 1/2a trial to evaluate the safety and tolerability of DB-1303/BNT323 in subjects with advanced solid tumors that express HER2....

San Diego, CAPHASE1796 participantsDualityBio Inc.

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NCT06324357Recruiting

Beamion BCGC-1: A Study to Find a Suitable Dose of Zongertinib Used Alone and in Combination With Other Treatments to Test Whether it Helps People With Different Types of HER2+ Cancer That Has Spread

This study is open to adults aged 18 years and older with different types of HER2+ cancer that has spread and cannot be removed by surgery. People can take part in this study if their tumours show HER...

San Diego, CAPHASE1768 participantsBoehringer Ingelheim

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NCT06982521Recruiting

Phase 3 Study of RLY-2608 + Fulvestrant vs Capivasertib + Fulvestrant as Treatment for Locally Advanced or Metastatic PIK3CA-mutant HR+/HER2- Breast Cancer

This is a global, multicenter, open-label, randomized Phase 3 study comparing the efficacy and safety of RLY-2608 + fulvestrant to capivasertib + fulvestrant for the treatment of patients with HR+/HER...

San Diego, CAPHASE3540 participantsRelay Therapeutics, Inc.

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NCT07100106Recruiting

A Study to Evaluate the Effect of GDC-4198 Alone and in Combination With Giredestrant Versus Abemaciclib and Giredestrant in Participants With Locally Advanced or Metastatic Estrogen Receptor-Positive (ER+), Human Epidermal Growth Factor Receptor-Negative (HER2-) Breast Cancer

The purpose of this study is to assess the safety of GDC-4198 alone and in combination with giredestrant and also the efficacy of GDC-4198 + giredestrant versus abemaciclib + giredestrant in participa...

San Diego, CAPHASE1285 participantsGenentech, Inc.

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NCT05856773Recruiting

Conventionally Fractionated vs. Hypofractionated Comprehensive Nodal Irradiation for Breast Cancer Using Pencil Beam Scanning Proton Therapy

The purpose of this research study is to learn more about the effects of using proton radiation therapy delivered over a shorter course of treatment (3 weeks) compared with a longer, standard course o...

San Diego, CAPHASE3276 participantsProton Collaborative Group

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NCT05964504Recruiting

Improving Survival for Metastatic Lobular Breast Cancer (PLUMB Registry)

This is a prospective observational registry for patients with invasive lobular carcinoma (ILC) of the breast. After the first 1cohort is enrolled, the collected data will be utilized to develop an IL...

San Diego, CA150 participantsUniversity of California, San Francisco

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NCT01766297Recruiting

Phase II Protocol of Proton Therapy for Partial Breast Irradiation in Early Stage Breast Cancer

The purpose of this research study is to compare the effects (good and bad) on women and their cancer using proton radiation therapy. This study is being done to see if proton radiation therapy will ...

San Diego, CAPHASE2132 participantsProton Collaborative Group

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NCT06764940Recruiting

A Pivotal Phase II Clinical Trial of Utidelone Injection Plus Capecitabine in HER2-negative Breast Cancer Patients With Brain Metastases

This study is a multicenter, two-stage clinical trial to evaluate the efficacy and safety of utidelone in combination with capecitabine in patients with HER2-negative breast cancer with brain metastas...

San Diego, CAPHASE2120 participantsBiostar Pharma, Inc.

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NCT06126276Recruiting

Testing the Use of Neratinib or the Combination of Neratinib and Palbociclib Targeted Treatment for HER2+ Solid Tumors (A ComboMATCH Treatment Trial)

This phase II ComboMATCH treatment trial compares the effect of neratinib to the combination of neratinib and palbociclib in treating patients with HER2 positive solid tumors. Neratinib and palbocicli...

San Diego, CAPHASE270 participantsNational Cancer Institute (NCI)

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NCT06590857Recruiting

Trial of 225Ac-DOTATATE (RYZ101) in Subjects With ER+, HER2-negative Unresectable or Metastatic Breast Cancer Expressing SSTRs.

Phase 1b/2 open-label trial of 225Ac-DOTATATE (RYZ101) in subjects with ER+, HER2-negative unresectable or metastatic breast cancer expressing SSTRs....

San Diego, CAPHASE164 participantsRayzeBio, Inc.

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NCT05455619Recruiting

Evexomostat Plus PI3K or AKT Inhibitor and Fulvestrant in Patients With a PI3K Alteration and HR+/Her2- Breast Cancer

This is a Phase 1b/2, open-label, parallel-arms pilot study in men and post-menopausal women with hormone receptor positive (HR+), HER2- advanced or metastatic breast cancer with an alteration in the ...

San Diego, CAPHASE152 participantsSynDevRx, Inc.

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About Breast Cancer Clinical Trials in San Diego

Breast cancer is a disease in which cells in the breast grow out of control. It is the most common cancer in women worldwide and can also occur in men. Treatment options include surgery, radiation, chemotherapy, hormone therapy, and targeted therapies.

There are currently 14 breast cancer clinical trials recruiting participants in San Diego, CA. These studies are seeking a combined 504,433 participants. Research is being sponsored by Jonsson Comprehensive Cancer Center, University of California, San Francisco, Celcuity Inc and 9 other organizations. Clinical trial participation is free and participants receive study-related medical care at no cost.

Breast Cancer Clinical Trials in San Diego — FAQ

Are there breast cancer clinical trials in San Diego?

Yes, there are 14 breast cancer clinical trials currently recruiting in San Diego, CA. Browse the studies on this page to find one that fits.

How do I join a clinical trial in San Diego?

Browse the studies listed above, click one that interests you, and complete the free eligibility form. A study coordinator at the San Diego research site will contact you about next steps.

Are clinical trials in San Diego free?

Yes, clinical trial participation is always free. Study-related treatment, medical tests, and doctor visits are provided at no cost. Many San Diego studies also compensate for your time and travel.

What breast cancer treatments are being tested?

The 14 active trials in San Diego are testing new therapies including novel drugs, biologics, and treatment approaches for breast cancer.

Data updated October 16, 2026 from ClinicalTrials.gov