CancerDrs

Breast Cancer clinical trials in California

87 actively recruiting breast cancer trials at 102 sites across California.

Data from ClinicalTrials.gov · last refreshed

Payments from drug makers to the doctors running these trials

For 2 of the trials on this page, the pharmaceutical company funding the trial also disclosed payments to the physicians leading it — public data from the federal CMS Open Payments database. Paying clinical-trial investigators for site work is expected and necessary for industry-funded trials; the scale and source are simply useful context when you're deciding whether to enroll. See the full breast cancer transparency page →

Phase 3 Recruiting Academic/Other

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

This Phase III Trial evaluates whether breast conservation surgery and endocrine therapy results in a non-inferior rate of invasive or non-invasive ipsilateral breast tumor recurrence (IBTR) compared to breast conservation with breast radi…

Sponsor: NRG Oncology
NCT ID: NCT04852887
Sites in California:
  • Kaiser Permanente-Anaheim — Anaheim, California
  • Kaiser Permanente-Deer Valley Medical Center — Antioch, California
  • Mission Hope Medical Oncology - Arroyo Grande — Arroyo Grande, California
  • PCR Oncology — Arroyo Grande, California
  • Sutter Auburn Faith Hospital — Auburn, California
Phase 3 Recruiting Academic/Other

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

This phase III trial compares 6 months of human epidermal growth factor receptor 2 (HER2)-targeted therapy to 12 months of HER2-targeted therapy for the treatment of HER2-positive (+) breast cancer in patients that had a pathologic complet…

Sponsor: Alliance for Clinical Trials in Oncology
NCT ID: NCT06876714
Sites in California:
  • Mission Hope Medical Oncology - Arroyo Grande — Arroyo Grande, California
  • Tower Cancer Research Foundation — Beverly Hills, California
  • Mercy Cancer Center - Carmichael — Carmichael, California
  • Mercy San Juan Medical Center — Carmichael, California
  • Enloe Medical Center — Chico, California
Phase 3 Recruiting NIH

Adding an Immunotherapy Drug, MEDI4736 (Durvalumab), to the Usual Chemotherapy Treatment (Paclitaxel, Cyclophosphamide, and Doxorubicin) for Stage II-III Breast Cancer

This phase III trial compares the addition of an immunotherapy drug (durvalumab) to usual chemotherapy versus usual chemotherapy alone in treating patients with MammaPrint High 2 Risk (MP2) stage II-III hormone receptor positive, HER2 nega…

Sponsor: National Cancer Institute (NCI)
NCT ID: NCT06058377
Sites in California:
  • Sutter Auburn Faith Hospital — Auburn, California
  • AIS Cancer Center at San Joaquin Community Hospital — Bakersfield, California
  • Alta Bates Summit Medical Center-Herrick Campus — Berkeley, California
  • Tower Cancer Research Foundation — Beverly Hills, California
  • City of Hope Comprehensive Cancer Center — Duarte, California
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
Sites in California:
  • Kaiser Permanente-Anaheim — Anaheim, California
  • Kaiser Permanente-Deer Valley Medical Center — Antioch, California
  • AIS Cancer Center at San Joaquin Community Hospital — Bakersfield, California
  • Kaiser Permanente-Baldwin Park — Baldwin Park, California
  • Kaiser Permanente-Bellflower — Bellflower, California
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
Sites in California:
  • Research Site — Duarte, California
  • Research Site — Fountain Valley, California
  • Research Site — Greenbrae, California
  • Research Site — Irvine, California
  • Research Site — La Jolla, California
Phase 3 Recruiting Industry

Sacituzumab Tirumotecan (MK-2870) Plus Pembrolizumab Versus TPC in TNBC Who Did Not Achieve pCR (MK-2870-012)

This is a randomized, open-label study comparing the efficacy and safety of adjuvant sacituzumab tirumotecan (MK-2870) in combination with pembrolizumab compared to treatment of physician's choice (TPC) in participants with triple-negative…

Sponsor: Merck Sharp & Dohme LLC
NCT ID: NCT06393374
Sites in California:
  • MemorialCare Orange Coast Medical Center ( Site 9501) — Fountain Valley, California
  • Scripps Cancer Center ( Site 0052) — La Jolla, California
  • Cancer and Blood Specialty Clinic ( Site 0008) — Los Alamitos, California
  • Kaiser Permanente - Oakland ( Site 0079) — Oakland, California
  • Profound Research LLC ( Site 0105) — Oceanside, California
Phase 3 Recruiting Academic/Other

Testing Proton Craniospinal Radiation Therapy Versus the Usual Radiation Therapy for Leptomeningeal Metastasis, RADIATE-LM Trial

This phase III trial compares proton craniospinal irradiation (pCSI) to involved-field radiation therapy (IFRT) for the treatment of breast or non-small cell lung cancer that has spread from where it first started to the cerebrospinal flui…

Sponsor: NRG Oncology
NCT ID: NCT06500481
Sites in California:
  • UC San Diego Health System - Encinitas — Encinitas, California
  • UC San Diego Moores Cancer Center — La Jolla, California
  • UC San Diego Medical Center - Hillcrest — San Diego, California
  • California Protons Cancer Therapy Center — San Diego, California
Phase 3 Recruiting Industry

OP-1250 (Palazestrant) vs. Standard of Care for the Treatment of ER+/HER2- Advanced Breast Cancer

This phase 3 clinical trial compares the safety and efficacy of palazestrant (OP-1250) to the standard-of-care options of fulvestrant or an aromatase inhibitor in women and men with breast cancer whose disease has advanced on one endocrine…

Sponsor: Olema Pharmaceuticals, Inc.
NCT ID: NCT06016738
Sites in California:
  • Clinical Trial Site — Fountain Valley, California
  • Clinical Trial Site — Glendale, California
  • Clinical Trial Site — La Jolla, California
  • Clinical Trial Site — Los Alamitos, California
  • Clinical Trial Site — Los Angeles, California
Phase 3 Recruiting Industry

A Study of Sacituzumab Tirumotecan (MK-2870) as a Single Agent and in Combination With Pembrolizumab (MK-3475) Versus Treatment of Physician's Choice in Participants With HR+/HER2- Unresectable Locally Advanced or Metastatic Breast Cancer (MK-2870-010)

The purpose of this study is to compare sacituzumab tirumotecan as a single agent, and in combination with pembrolizumab, versus Treatment of Physician's Choice (TPC) in participants with hormone receptor positive/human epidermal growth fa…

Sponsor: Merck Sharp & Dohme LLC
NCT ID: NCT06312176
Sites in California:
  • Providence Medical Foundation-Oncology ( Site 0020) — Fullerton, California
  • Moores Cancer Center ( Site 0059) — La Jolla, California
  • Cancer and Blood Specialty Clinic ( Site 0001) — Los Alamitos, California
Phase 3 Recruiting Industry

A Clinical Study of Patritumab Deruxtecan to Treat Breast Cancer (MK-1022-016)

Researchers are looking for other ways to treat breast cancer (BC) that is hormone receptor-positive and human epidermal growth factor receptor 2-negative (HR+/HER2-) and either unresectable locally advanced or metastatic. * HR positive (H…

Sponsor: Merck Sharp & Dohme LLC
NCT ID: NCT07060807
Sites in California:
  • Los Angeles Hematology Oncology Medical Group ( Site 0026) — Los Angeles, California
  • Hoag Memorial Hospital Presbyterian ( Site 0025) — Newport Beach, California
Phase 3 Recruiting Industry

BGB-43395 Plus Letrozole Versus CDK4/6i Plus Letrozole for Patients With Advanced or Metastatic HR+/HER2- Breast Cancer Who Have Not Received Prior Treatment for Advanced or Metastatic Disease

The purpose of this study is to investigate the efficacy and safety of BGB-43395 in combination with letrozole compared with investigator's choice of cyclin-dependent kinase 4/6 inhibitor (CDK4/6i) in combination with letrozole in patients…

Sponsor: BeOne Medicines
NCT ID: NCT07492641
Sites in California:
  • Helios Clinical Research the Oncology Institute Fountain Valley — Fountain Valley, California
Phase 3 Recruiting Industry

A Study to Evaluate the Efficacy and Safety of Inavolisib in Combination With Phesgo Versus Placebo in Combination With Phesgo in Participants With PIK3CA-Mutated HER2-Positive Locally Advanced or Metastatic Breast Cancer

This study will evaluate the efficacy and safety of inavolisib in combination with Phesgo (pertuzumab, trastuzumab, and rHuPH20 injection for subcutaneous use) compared with placebo in combination with Phesgo, as maintenance therapy, after…

Sponsor: Hoffmann-La Roche
NCT ID: NCT05894239
Sites in California:
  • Disney Family Cancer Center — Burbank, California
  • City of Hope — Corona, California
  • City of Hope Comprehensive Cancer Center — Duarte, California
  • City of Hope at Irvine Lennar — Irvine, California
  • Ellison Institute of Technology — Los Angeles, California
Phase 2 Recruiting NIH

Targeted Therapy Directed by Genetic Testing in Treating Patients With Locally Advanced or Advanced Solid Tumors, The ComboMATCH Screening Trial

This ComboMATCH patient screening trial is the gateway to a coordinated set of clinical trials to study cancer treatment directed by genetic testing. Patients with solid tumors that have spread to nearby tissue or lymph nodes (locally adva…

Sponsor: National Cancer Institute (NCI)
NCT ID: NCT05564377
Sites in California:
  • PCR Oncology — Arroyo Grande, California
  • Mercy Cancer Center - Carmichael — Carmichael, California
  • Mercy San Juan Medical Center — Carmichael, California
  • Epic Care-Dublin — Dublin, California
  • Mercy Cancer Center - Elk Grove — Elk Grove, California
Phase 2 Recruiting Academic/Other

I-SPY TRIAL: Neoadjuvant and Personalized Adaptive Novel Agents to Treat Breast Cancer

The purpose of this study is to further advance the ability to practice personalized medicine by learning which new drug agents are most effective with which types of breast cancer tumors and by learning more about which early indicators o…

Sponsor: QuantumLeap Healthcare Collaborative
NCT ID: NCT01042379
Sites in California:
  • University of California - Davis, Comprehensive Cancer Center — Davis, California
  • City of Hope — Duarte, California
  • University of California San Diego — La Jolla, California
  • University of Southern California — Los Angeles, California
  • HOAG Memorial Hospital Presbyterian — Newport Beach, California
Phase 2 Recruiting Industry

A Study of Alisertib in Combination With Endocrine Therapy in Patients With HR-positive, HER2-negative Recurrent or Metastatic Breast Cancer

PUMA-ALI-1201 is a randomized, dose optimization, multicenter, Phase 2 study of alisertib administered in combination with endocrine therapy in participants with pathology-confirmed HR-positive/HER2-negative metastatic breast cancer (MBC) …

Sponsor: Puma Biotechnology, Inc.
NCT ID: NCT06369285
Sites in California:
  • Beverly Hills Cancer Center — Beverly Hills, California
  • MemorialCare Orange Coast Medical Center — Fountain Valley, California
  • City of Hope at Orange County Lennar Foundation Cancer Center — Irvine, California
  • LA Cancer Network — Los Angeles, California
  • UCLA Department of Medicine - Hematology/Oncology — Los Angeles, California
Phase 1, Phase 2 Recruiting Industry

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.

Sponsor: DualityBio Inc.
NCT ID: NCT05150691
Sites in California:
  • Helios Clinical Research — Cerritos, California
  • California Research Institute — Los Angeles, California
  • Sharp Memorial Hospital — San Diego, California
Phase 2 Recruiting Industry

A Study to Assess the Efficacy and Safety of FORE8394 in Participants With Cancer Harboring BRAF Alterations

The objective of this Master Protocol is to evaluate the efficacy and safety of plixorafenib in participants with BRAF altered (BRAF V600E or BRAF fusions) locally advanced or metastatic solid tumors, or recurrent or progressive primary ce…

Sponsor: Fore Biotherapeutics
NCT ID: NCT05503797
Sites in California:
  • Precision NextGen Oncology & Research Center — Beverly Hills, California
  • UCSF Helen Diller Family Comprehensive Cancer Center — San Francisco, California
  • University of California Los Angeles Rheumatology — Westwood, Los Angeles, California
Phase 2 Recruiting NIH

Testing the Addition of an Individualized Vaccine to Durvalumab and Tremelimumab and Chemotherapy in Patients With Metastatic Triple Negative Breast Cancer

This phase II trial studies how well nab-paclitaxel, durvalumab, and tremelimumab with or without personalized synthetic long peptide vaccine (neoantigen vaccine) works in treating patients with triple negative breast cancer that has sprea…

Sponsor: National Cancer Institute (NCI)
NCT ID: NCT03606967
Sites in California:
  • UC Irvine Health/Chao Family Comprehensive Cancer Center — Orange, California
  • University of California Davis Comprehensive Cancer Center — Sacramento, California
Phase 2 Recruiting Academic/Other

DCIS: RECAST Trial Ductal Carcinoma In Situ: Re-Evaluating Conditions for Active Surveillance Suitability as Treatment

The goal of this trial is to see if active surveillance monitoring and hormonal therapy in patients diagnosed with ductal cell carcinoma in situ (DCIS), an early stage of breast cancer, can be an effective management of the disease. Partic…

Sponsor: QuantumLeap Healthcare Collaborative
NCT ID: NCT06075953
Sites in California:
  • Berkeley Outpatient Center — Berkeley, California
  • City of Hope -Duarte Cancer Center — Duarte, California
  • City of Hope - Lennar Foundation Cancer Center — Irvine, California
  • UCLA — Los Angeles, California
  • UCSF — San Francisco, California
Phase 1, Phase 2 Recruiting Industry

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 HER2 aberrations and previous treatment wa…

Sponsor: Boehringer Ingelheim
NCT ID: NCT06324357
Sites in California:
  • The Oncology Institute of Hope and Innovation — Cerritos, California
  • Ellison Medical Institute — Los Angeles, California
  • Valkyrie Clinical Trials — Los Angeles, California
  • University of California Los Angeles — Los Angeles, California
  • University of California Irvine — Orange, California
Phase 1, Phase 2 Recruiting Industry

A Study to Evaluate the Efficacy and Safety of Ifinatamab Deruxtecan (I-DXd) in Subjects With Recurrent or Metastatic Solid Tumors (IDeate-PanTumor02)

This study is designed to assess the efficacy and safety of ifinatamab deruxtecan (I-DXD) in the following tumor types: endometrial cancer (EC); head and neck squamous cell carcinoma (HNSCC); pancreatic ductal adenocarcinoma (PDAC); colore…

Sponsor: Daiichi Sankyo
NCT ID: NCT06330064
Sites in California:
  • Valkyrie Clinical Trials — Los Angeles, California
  • Los Angeles Cancer Network — Los Angeles, California
  • Pih Health Hematology Medical Oncology — Whittier, California
Phase 2 Recruiting Industry

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 metastases. Patients will be enrolled to receiv…

Sponsor: Biostar Pharma, Inc.
NCT ID: NCT06764940
Sites in California:
  • City of Hope--Duarte — Duarte, California
  • Cancer & Blood Research Center, LLC — Los Alamitos, California
  • Univ. of California Los Angeles — Los Angeles, California
  • FOMAT Medical Research (Network) — Oxnard, California
  • Scripps Health — San Diego, California
Phase 1, Phase 2 Recruiting Industry

Study of ORIC-114 in Patients With Advanced Solid Tumors Harboring an EGFR or HER2 Alteration

The purpose of this study is to establish the recommended Phase 2 dose (RP2D) and/or maximum tolerated dose (MTD), safety, pharmacokinetics (PK), pharmacodynamics (PD), and antitumor activity of ORIC-114 as a Single Agent or in Combination…

Sponsor: ORIC Pharmaceuticals
NCT ID: NCT05315700
Sites in California:
  • City of Hope — Duarte, California
  • City of Hope — Huntington Beach, California
  • City of Hope — Irvine, California
  • City of Hope — Long Beach, California
  • University of California, San Francisco — San Francisco, California
Phase 1, Phase 2 Recruiting Industry

Safety and Tolerability of TNG462 in Patients With MTAP-deleted Solid Tumors

This is a first in human study in patients with advanced or metastatic solid tumors known to have an MTAP deletion. The first part of the study is an open-label, dose escalation and the second part is an open label dose expansion in specif…

Sponsor: Tango Therapeutics, Inc.
NCT ID: NCT05732831
Sites in California:
  • Stanford University — Palo Alto, California
Phase 1, Phase 2 Recruiting Industry

A Phase I/IIa Study of AZD8205 Given Alone or Combined, in Participants With Advanced/Metastatic Solid Malignancies

This research study is studying a new compound, AZD8205, as a possible treatment for advanced or metastatic solid tumours alone or in combination with anti-cancer agents

Sponsor: AstraZeneca
NCT ID: NCT05123482
Sites in California:
  • Research Site — Duarte, California
  • Research Site — Irvine, California
  • Research Site — Santa Monica, California
  • Research Site — Santa Rosa, California

Showing 25 of 87 trials with sites in California. See all breast cancer trials →

Medical disclaimer: 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: 2026-08-10