CancerDrs

Breast Cancer clinical trials in California

85 actively recruiting breast cancer trials at 105 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

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
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

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 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
Sites in California:
  • Kaiser Permanente-Anaheim — Anaheim, California
  • Kaiser Permanente-Bellflower — Bellflower, California
  • City of Hope Corona — Corona, California
  • City of Hope Comprehensive Cancer Center — Duarte, California
  • UC San Diego Health System - Encinitas — Encinitas, California
Phase 3 Recruiting Industry

A Study of Camizestrant in ER+/HER2- Early Breast Cancer After at Least 2 Years of Standard Adjuvant Endocrine Therapy

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

Sponsor: AstraZeneca
NCT ID: NCT05774951
Sites in California:
  • Research Site — Anaheim, California
  • Research Site — Beverly Hills, California
  • Research Site — Concord, California
  • Research Site — Corona, California
  • Research Site — Fountain Valley, 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 Industry

Saruparib (AZD5305) Plus Camizestrant or Plus Endocrine Therapy, 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
Sites in California:
  • Research Site — Fountain Valley, California
  • Research Site — Glendale, California
  • Research Site — Los Angeles, California
  • Research Site — Newport Beach, 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

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 (zovegalisib) + fulvestrant to capivasertib + fulvestrant for the treatment of patients with HR+/HER2- ABC with PIK3CA mutati…

Sponsor: Relay Therapeutics, Inc.
NCT ID: NCT06982521
Sites in California:
  • Beverly Hills Cancer Center — Beverly Hills, California
  • City of Hope National Medical Center — Duarte, California
  • Cedars-Sinai Medical Center — Los Angeles, California
  • Stanford Women's Cancer Center — Palo Alto, California
  • University of California, Davis Comprehensive Cancer Center — Sacramento, California
Phase 3 Recruiting Industry

Palazestrant in Combination With Ribociclib for the First-line Treatment of ER+/HER2- Advanced Breast Cancer

This phase 3 clinical trial compares the efficacy and safety of palazestrant with ribociclib to letrozole and ribociclib in women and men who have not received prior systemic anti-cancer treatment for advanced breast cancer.

Sponsor: Olema Pharmaceuticals, Inc.
NCT ID: NCT07085767
Sites in California:
  • Clinical Trial Site — Beverly Hills, California
  • Clinical Trial Site — La Jolla, California
  • Clinical Trial Site — Los Alamitos, California
  • Clinical Trial Site — San Francisco, California
  • Clinical Trial Site — Santa Barbara, California
Phase 2, Phase 3 Recruiting Industry

A Study of Izalontamab Brengitecan Versus Chemotherapy in Participants With Previously Untreated, Locally Advanced, Recurrent Inoperable, or Metastatic Triple-negative Breast Cancer Ineligible for Anti-PD(L)1 Drugs (IZABRIGHT-Breast01)

The purpose of this study is to assess the efficacy and safety of iza-bren, a bi-specific antibody-drug conjugate against EGFR and HER3 with a topoisomerase inhibitor payload versus treatment of physician's choice (TPC) (paclitaxel, nab-pa…

Sponsor: Bristol-Myers Squibb
NCT ID: NCT06926868
Sites in California:
  • Helios Clinical Research — Cerritos, California
  • Local Institution - 0307 — Cerritos, California
  • Local Institution - 0308 — Cerritos, California
  • Local Institution - 0309 — Cerritos, California
  • Local Institution - 0311 — Long Beach, 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 Network

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 of treatment (5 weeks) for women with br…

Sponsor: Proton Collaborative Group
NCT ID: NCT05856773
Sites in California:
  • California Protons Cancer Therapy Center — San Diego, 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 1, Phase 2 Recruiting Industry

The Evaluation of PC14586 in Patients With Advanced Solid Tumors Harboring a TP53 Y220C Mutation (PYNNACLE)

The Phase 2 monotherapy portion of this study is currently enrolling and will evaluate the efficacy and safety of PC14586 (INN rezatapopt) in participants with locally advanced or metastatic solid tumors harboring a TP53 Y220C mutation. Th…

Sponsor: PMV Pharmaceuticals, Inc
NCT ID: NCT04585750
Sites in California:
  • University of California Irvine Chao Family Comprehensive Cancer Center — Irvine, California
  • University of San Diego Moores Cancer Center — La Jolla, California
  • UCLA Jonsson Comprehensive Cancer Center — Los Angeles, California
  • USC Norris Comprehensive Cancer Center — Los Angeles, 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

A Study of Emiltatug Ledadotin (Emi-Le) in Participants With Solid Tumors

A Study of Emi-Le in Participants with Solid Tumors

Sponsor: Day One Biopharmaceuticals, Inc.
NCT ID: NCT05377996
Sites in California:
  • UC Irvine Health-Chao Family Comprehensive Cancer Center — Orange, California
  • UCSF Helen Diller Family Comprehensive Cancer Center — San Francisco, California
  • UCLA David Geffen School of Medicine, Division of Hematology/Oncology — Santa Monica, California
Phase 2 Recruiting Industry

Efficacy and Safety Study of Halneuron in the Treatment of Chemotherapy-Induced Neuropathic Pain

A randomized study to determine safety and efficacy of a series of subcutaneous (SC) injections of HAL in patients with CINP, compared to matching placebo injections. After that, subjects may have the option to enter an Open Label extensio…

Sponsor: Dogwood Therapeutics Inc.
NCT ID: NCT06848348
Sites in California:
  • Central Recruiting Site — Fair Oaks, California
  • Central Recruiting Site — Fountain Valley, California
  • Central Recruiting Site — Los Angeles, California
  • Central Recruiting Site — Santa Rosa, California
Phase 2 Recruiting Industry

ASPEN-09-03: A Study of Evorpacept in Combination With Trastuzumab and Chemotherapy in Metastatic HER2-Positive Breast Cancer

The Substudy Protocol ASPEN-09-03 is a Phase 2, single-arm, multicenter study evaluating the efficacy, safety, and tolerability of evorpacept in combination with trastuzumab and chemotherapy in participants with HER2-positive metastatic br…

Sponsor: ALX Oncology Inc.
NCT ID: NCT07007559
Sites in California:
  • City of Hope — Duarte, California
  • UC San Diego Moores Cancer Center — La Jolla, California
  • UC Irvine Health - Chao Family Comprehensive Cancer Center — Orange, California
Phase 1, Phase 2 Recruiting Industry

A Study Evaluating the Efficacy and Safety of Multiple Treatment Combinations in Patients With Metastatic or Locally Advanced Breast Cancer

This is an umbrella study evaluating the efficacy and safety of multiple treatment combinations in participants with metastatic or inoperable locally advanced breast cancer. The study will be performed in two stages. During Stage 1, seven …

Sponsor: Hoffmann-La Roche
NCT ID: NCT03424005
Sites in California:
  • City of Hope — Duarte, California
  • University of California San Diego (UCSD) - Koman Family Outpatient Pavilion ? La Jolla — La Jolla, California
  • University of California San Diego Medical Center — La Jolla, California
  • Stanford Cancer Institute — Stanford, California
Phase 1, Phase 2 Recruiting Industry

A Phase 1/2 Trial of TER-2013 in Patients With Solid Tumors Harboring AKT/PI3K/PTEN Pathway Alterations

This is a Phase 1/2, open-label, multicenter study evaluating the safety, tolerability, pharmacokinetics, pharmacodynamics and anti-tumor activity of TER-2013 in patients with advanced solid tumors harboring AKT/PI3K/PTEN pathway alteratio…

Sponsor: Terremoto Biosciences Inc.
NCT ID: NCT07109726
Sites in California:
  • City of Hope — Duarte, California
  • City of Hope, Irvine — Irvine, California
Phase 1, Phase 2 Recruiting Industry

ORION-1: Study of AVZO-023 as a Single Agent and in Combination With AVZO-021, and/or Endocrine Therapy in Advanced Solid Tumors

This study, the first clinical trial of AVZO-023, aims to determine the safety, tolerability, pharmacokinetics (PK), pharmacodynamics, maximum tolerated dose, and anti-tumor effects of AVZO-023 in patients with advanced solid tumors. AVZO-…

Sponsor: Avenzo Therapeutics, Inc.
NCT ID: NCT06998407
Sites in California:
  • Avenzo Therapeutics Recruiting Site — Los Angeles, California
  • Avenzo Therapeutics Recruiting Site — Los Angeles, California
Phase 2 Recruiting Industry

A Phase 2 Study of PCS6422 With Capecitabine in Patients With Advanced or Metastatic Breast Cancer

This is an adaptive Phase 2, open-label, randomized, multi-center study evaluating up to 2 regimens of PCS6422 with capecitabine (Cap) vs. standard dose of Cap alone in patients with advanced or metastatic breast cancer. The goal of the st…

Sponsor: Processa Pharmaceuticals
NCT ID: NCT06568692
Sites in California:
  • Valkyrie Clinical Trials — Los Angeles, California
  • FOMAT Medical Research — Oxnard, California

Showing 25 of 85 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: 2026-09-07