Clinical trials · California
Breast cancer clinical trials in California
We’re tracking 237 recruiting breast cancer studies with a site in California — including Phase 1, Phase 1/Phase 2, Phase 2 and Phase 3 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT06638307RecruitingPhase 1
Study of new drug MEN2312 for advanced breast cancer with specific genetic changes
This trial tests a new drug, MEN2312, for people with advanced breast cancer that has specific genetic changes in PIK3CA, AKT1, or PTEN. It's for those who have already tried certain hormone therapies and a CDK4/6 inhibitor combination, and the cancer has continued to grow.
Duarte, CaliforniaAges 18 years+ - NCT06380751RecruitingPhase 3
New targeted therapy for BRCA/PALB2-mutated HR+ breast cancer
This trial tests a new combination of targeted therapies (saruparib plus camizestrant or hormone therapy) against standard treatments for people with a specific type of advanced breast cancer. It may be a good option if you have a BRCA1, BRCA2, or PALB2 gene mutation and have not yet had treatment for your advanced disease.
Fountain Valley, CaliforniaAges 18 years+ - NCT06545942RecruitingPhase 1
Studying MOMA-313 for advanced or metastatic solid tumors
This trial tests a new oral drug, MOMA-313, alone or with another drug (olaparib), in people whose cancer has a specific DNA repair problem (HR-deficient mutation). It aims to see if the drug can shrink tumors or slow their growth.
La Jolla, CaliforniaAges 18 years+ - NCT05827081RecruitingPhase 3
Ribociclib plus endocrine therapy for early breast cancer
This trial studies whether adding ribociclib to standard hormone (endocrine) therapy lowers the risk of breast cancer coming back in early-stage, hormone-receptor–positive cancer. It mainly looks at safety and how well the treatment controls cancer after surgery and (sometimes) prior hormone treatment.
Beverly Hills, CaliforniaAges 18–100 - NCT05894239RecruitingPhase 3
Tested targeted drug for HER2-positive breast cancer with PIK3CA changes
This Phase 3 study tests inavolisib plus Phesgo versus placebo plus Phesgo in people whose breast cancer has both HER2-positive and PIK3CA-mutated tumor markers. The goal is to see if adding inavolisib improves how well the treatment controls the cancer and how safe it is.
Burbank, CaliforniaAges 18 years+ - NCT06260033RecruitingPhase 2
Radiation Therapy for Oligoprogressive ER+ Breast Cancer
This trial tests whether a precise radiation treatment (SBRT) can target a few growing spots of estrogen receptor-positive breast cancer that has spread to other parts of the body. It also uses a special PET scan (FES PET/CT) to see how well the cancer responds. The goal is to slow down the cancer and delay the need for stronger treatments.
Duarte, CaliforniaAges 18 years+ - NCT06401421Recruiting
Blood test for tumor DNA after breast cancer chemo
This study tests a new blood test to see if it can find tiny bits of tumor DNA after chemotherapy. If you have a larger or higher-risk breast cancer and are getting chemotherapy before surgery, you may join. The test could help doctors know if your cancer is gone or if more treatment is needed.
Torrance, CaliforniaAges 18 years+ - NCT07406087Recruiting
Navigation support for young adults after cancer
This study tests a navigation program to help cancer survivors ages 21-45 get the follow-up care they need. It may be a good fit if you were diagnosed with certain cancers as a teen or young adult.
Pasadena, CaliforniaAges 21–45 - NCT06728579RecruitingPhase 2
Group therapy for joint pain in breast cancer survivors
This study tests two supportive group programs—one using mindfulness skills, the other providing supportive talk therapy—to help breast cancer survivors manage joint pain caused by hormone-blocking pills. If you have ongoing joint pain and are taking an aromatase inhibitor, you may be able to join a free, video-based group.
San Diego, CaliforniaAges 18 years+ - NCT07216105RecruitingPhase 1
FT836 immune cell therapy for advanced solid tumors
This study tests a new immune cell therapy called FT836, given alone or with chemotherapy or other antibodies, for people with advanced solid tumors that have not responded to previous treatments. The goal is to see if it is safe and helps shrink or control tumors.
La Jolla, CaliforniaAges 18 years+ - NCT05318469RecruitingPhase 1/Phase 2
Ivermectin with immunotherapy for metastatic triple-negative breast cancer
This trial studies whether ivermectin, given together with immunotherapy (balstilimab or pembrolizumab), can help treat metastatic triple-negative breast cancer. It mainly looks at safety first, and may also explore how well the treatment works for people whose cancer has spread.
Los Angeles, CaliforniaAges 18 years+ - NCT06551116Recruiting
Better HER2 testing for HER2-low breast cancer on Enhertu
This study looks at using a more detailed lab test to measure HER2 levels in people with HER2-low metastatic breast cancer who are starting or have just started treatment with Enhertu. The goal is to see if this test can help doctors better understand who might benefit from Enhertu.
San Francisco, CaliforniaAges 18 years+ - NCT05989828RecruitingPhase 1
Engineered immune cells for advanced triple-negative breast cancer
This trial tests a personalized treatment where your own immune cells are modified to recognize and attack cancer cells that have a specific marker called NY-ESO-1. It is for people with triple-negative breast cancer that has not responded to at least two prior treatments.
Los Angeles, CaliforniaAges 18 years+ - NCT06582017RecruitingPhase 1
Study of QXL138AM for advanced solid tumors and multiple myeloma
This trial tests an investigational drug called QXL138AM for people with advanced solid tumors or multiple myeloma that has not responded to standard treatments. The goal is to see if the drug is safe and effective.
Newport, CaliforniaAges 18 years+ - NCT06757634RecruitingPhase 3
A study of gedatolisib for first-line advanced breast cancer
This trial tests a new targeted therapy called gedatolisib for people with HR-positive, HER2-negative advanced breast cancer who have not yet received treatment for metastatic disease. It aims to see if adding this drug to standard hormone therapy can help control the cancer longer.
Los Angeles, CaliforniaAges 18 years+ - NCT06926920RecruitingPhase 1/Phase 2
Testing a new dose schedule of sacituzumab govitecan for advanced TNBC
This trial tests a different dose and schedule of the drug sacituzumab govitecan for people with advanced triple-negative breast cancer. It aims to see if this new approach is safer and more effective.
Los Angeles, CaliforniaAges 18 years+ - NCT07076147Recruiting
Breast cancer screening follow-up for moderate-risk women
This study looks at how well women with a moderate risk of breast cancer follow their screening recommendations (like yearly MRI or mammogram). It may help women who have certain genetic variants or a higher calculated risk stay on top of their breast health.
Los Angeles, CaliforniaAges 30–75 - NCT07145255RecruitingPhase 1/Phase 2
Study of MBRC-201 for advanced solid tumors
This trial tests a new drug, MBRC-201, for people with advanced solid tumors that have not responded to standard treatments. The goal is to find the best dose and see if it helps shrink tumors or slow their growth.
San Francisco, CaliforniaAges 18 years+ - NCT07558733RecruitingPhase 1/Phase 2
New drug combinations for advanced hormone-receptor positive breast cancer
This trial tests two new drugs (sapanisertib and serabelisib) alone or together to treat advanced breast cancer that is hormone-receptor positive. These drugs target specific pathways that help cancer grow, and the trial will see if they work better than standard treatments.
Los Angeles, CaliforniaAges 18 years+ - NCT06440005RecruitingPhase 1
Testing AGX101 for advanced solid tumors
This study tests a new drug called AGX101 for people with advanced solid tumors that have not responded to other treatments. The goal is to see if it is safe and if it can shrink tumors or slow their growth.
Los Angeles, CaliforniaAges 18 years+ - NCT06774963RecruitingPhase 1
Study of LNCB74 for advanced solid tumors
This trial tests a new drug called LNCB74 for people with advanced solid tumors that have not responded to other treatments. It aims to see if the drug is safe and effective.
Newport Beach, CaliforniaAges 18 years+ - NCT05298605Recruiting
Church-based program to help Korean women get breast screenings
This trial tests a faith-based (church-based) navigation program meant to help Korean women who have not had recent breast cancer screening get a mammogram. It may help by offering support and guidance through church and study staff.
Los Angeles, CaliforniaAges 45–80 - NCT04893109RecruitingPhase 2
Study compares two HER2 breast cancer treatments after surgery
This Phase 2 study tests two different medicines given after breast surgery to reduce the risk of cancer coming back. It is only for people with early-stage HER2-positive breast cancer with limited or no lymph node spread.
San Francisco, CaliforniaAges 18 years+ - NCT06242470RecruitingPhase 1
Study of MGC026 for advanced solid tumors
This trial tests a new drug called MGC026 that targets a protein called B7-H3 on cancer cells, aiming to shrink or slow different advanced solid tumors. It is an early-phase study to find the right dose and check safety.
Los Angeles, CaliforniaAges 18 years+
Breast cancer trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting breast cancer studies listed above.
- City of Hope Comprehensive Cancer Center · 5 studies
- University of California, San Francisco · 4 studies
- Cedars-Sinai Medical Center · 3 studies
- USC / Norris Comprehensive Cancer Center · 3 studies
- City of Hope Orange County Lennar Foundation Cancer Center · 2 studies
- Los Angeles Cancer Network · 2 studies
- Providence Medical Foundation · 2 studies
- UC San Diego Moores Cancer Center · 2 studies
What taking part in a breast cancer study involves
A screening visit first
Before anything else, the study team checks whether you fit — usually a visit with some tests. You can stop at any point, and screening is typically free.
Care at a nearby site
Study visits happen at a clinic or hospital taking part. Many studies cover the cost of the study treatment and related visits, and some reimburse travel.
You stay in control
Taking part is voluntary and you can leave a study at any time, for any reason, without affecting your regular care.
The team decides eligibility
Our fit check is a helpful first read, not a decision. The study team makes the final call after reviewing your health history.
Breast cancer trials in other states
Common questions
- Are there breast cancer clinical trials in California?
- Yes. We're currently tracking 237 recruiting breast cancer studies with a site in California, each rewritten in plain language so you can see what it's testing and who it's for.
- How do I find out if I qualify for a breast cancer study in California?
- Each study lists its eligibility rules — age, diagnosis, prior treatments. On every trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Do I have to live in California to take part?
- Not necessarily. These studies have a site in California, but eligibility is about your health, not your address — some people travel to take part, and a few studies reimburse travel. The study team can tell you what's required.
- Does it cost anything to join a breast cancer trial?
- Using Clin2 is always free. Many trials cover the study treatment and related visits; some reimburse travel. The study team explains exactly what's covered before you decide.
Not the right time?
New breast cancer studies open in California regularly. Set up a health profile and we’ll quietly watch for studies that fit you and email you when one opens.
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.