Clinical trials · California
Advanced Breast Cancer clinical trials in California
We’re tracking 153 recruiting advanced 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
- NCT07492641RecruitingPhase 3
A new drug plus letrozole for advanced HR+ breast cancer
This trial tests a new medicine (BGB-43395) combined with letrozole against the usual CDK4/6 inhibitor plus letrozole. It is for people with advanced or metastatic HR-positive, HER2-negative breast cancer who have not yet had treatment for advanced disease.
Fountain Valley, CaliforniaAges 18 years+ - NCT06586957RecruitingPhase 1
Study of NKT3964 for advanced solid tumors
This trial tests an experimental drug called NKT3964 for people with certain advanced cancers that have stopped responding to standard treatments. It aims to see if the drug can shrink tumors or slow their growth.
Los Angeles, CaliforniaAges 19 years+ - NCT06827236RecruitingPhase 1/Phase 2
Testing a new combination treatment for advanced breast cancer
This study tests two experimental drugs, BNT323 and BNT327, together in people with advanced breast cancer. The goal is to find the best dose and see if the combination is safe and helpful.
Beverly Hills, CaliforniaAges 18 years+ - NCT06590857RecruitingPhase 1/Phase 2
Study of targeted radiation for advanced breast cancer
This trial tests a new type of radiation therapy that targets a specific protein on some breast cancer cells. It may help people whose cancer has stopped responding to other treatments.
Irvine, CaliforniaAges Any age - NCT07647328RecruitingPhase 3
Camizestrant and ribociclib for advanced hormone-receptor-positive breast cancer
This trial tests a combination of two drugs (camizestrant and ribociclib) for advanced breast cancer that is hormone-receptor-positive and HER2-negative. The study aims to see if this combination helps patients whose cancer cannot be surgically removed or treated with radiation alone.
Palo Alto, CaliforniaAges 18–130 - NCT07524322RecruitingPhase 1
RGT-490 for Advanced Cancers With PIK3CA Mutations
This study tests a new drug called RGT-490 in patients with advanced solid tumors (cancers that have spread or cannot be removed by surgery) that have a specific genetic change called a PIK3CA mutation. The drug is designed to block a protein involved in cancer cell growth.
Los Angeles, CaliforniaAges 18 years+ - NCT07405801RecruitingPhase 2
Inavolisib plus ribociclib plus fulvestrant for advanced breast cancer
This trial tests a combination of three drugs (inavolisib, ribociclib, and fulvestrant) compared to a placebo plus two of the drugs (ribociclib and fulvestrant) for people with advanced hormone receptor-positive breast cancer who have not had prior treatment for advanced disease. The goal is to see if adding inavolisib improves outcomes.
Anaheim, CaliforniaAges 18 years+ - NCT07383506RecruitingPhase 1
Study of a targeted pill for PIK3CA-mutated advanced cancers
This trial tests a new pill (CGT6297) that targets cancer cells with a specific PIK3CA gene change. It may be an option for people with certain advanced solid tumors, including endometrial or breast cancer, after standard treatments have stopped working.
Los Angeles, CaliforniaAges 18 years+ - NCT07368998RecruitingPhase 2
Study of inavolisib plus fulvestrant for advanced breast cancer
This trial tests whether a new targeted pill (inavolisib) plus hormone therapy (fulvestrant) can slow or stop breast cancer growth in people whose cancer has a specific genetic change called a PIK3CA mutation. It is for patients whose disease worsened after previous hormone-and-CDK-inhibitor treatment.
Los Angeles, CaliforniaAges 18 years+ - NCT07318805RecruitingPhase 1
A study of PF-08032562 for advanced solid tumors
This study tests a new medicine, PF-08032562, for people with advanced breast or colorectal cancer that has not responded to prior treatments. It aims to see if the drug is safe and can help shrink or slow the cancer.
Duarte, CaliforniaAges 18 years+ - NCT07321106RecruitingPhase 1
CBI-1214 for advanced colorectal cancer
This trial tests a new drug called CBI-1214, which is designed to help your immune system attack cancer cells. It is for people with advanced colorectal cancer that has not responded to other treatments.
Duarte, CaliforniaAges 18 years+ - NCT07227233RecruitingPhase 2
AI-guided retrial of CDK4/6 inhibitors for advanced breast cancer
This trial tests whether an artificial intelligence (AI) tool can help doctors decide if it is safe and effective to give you a second course of a CDK4/6 inhibitor drug (like palbociclib, ribociclib, or abemaciclib) plus hormone therapy for advanced (unresectable or metastatic) HR+/HER2- breast cancer. The goal is to only treat people whose cancer is likely to respond based on a special AI analysis of their tumor tissue.
La Jolla, CaliforniaAges 18 years+ - NCT07216105RecruitingPhase 1
New immune cell treatment for advanced solid tumors
This trial tests a new treatment using specially engineered immune cells (called FT836) for people with advanced solid tumors that have not responded to other treatments. It may be given alone or with chemotherapy and/or other antibody medicines. The study aims to see if this approach can shrink tumors or slow their growth.
La Jolla, CaliforniaAges 18 years+ - NCT07191717RecruitingPhase 2
Imlunestrant and abemaciclib for early ER+ breast cancer
This trial tests whether adding two targeted drugs, imlunestrant and abemaciclib, to your usual hormone therapy can lower the chance of your breast cancer coming back. It is for people with early-stage ER+ breast cancer who have no signs of cancer on scans but have tiny amounts of tumor DNA in their blood (called ctDNA).
Los Angeles, CaliforniaAges 18 years+ - NCT07174336RecruitingPhase 3
Testing Tersolisib with other treatments for advanced breast cancer
This trial tests a new study drug called Tersolisib combined with other anti-cancer treatments for people with advanced breast cancer that has a specific gene change (PIK3CA). The goal is to see if the combination can help shrink or slow the cancer.
Clovis, CaliforniaAges 18 years+ - NCT04503265RecruitingPhase 1/Phase 2
AMXI-5001 study for advanced cancers that won’t respond
This Phase 1/2 trial tests AMXI-5001 in people with advanced cancers that have progressed or stopped responding to standard treatments. It’s mainly designed to find the safest dose and see early signs the treatment might work.
Los Angeles, CaliforniaAges 18 years+ - 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+ - NCT07100106RecruitingPhase 1/Phase 2
Study of GDC-4198 alone or with giredestrant for advanced breast cancer
This trial tests a new treatment (GDC-4198) alone or with another drug (giredestrant) compared to a standard combination (abemaciclib and giredestrant) for people with advanced hormone receptor-positive, HER2-negative breast cancer that has progressed after previous treatments.
Duarte, CaliforniaAges 18 years+ - NCT07085767RecruitingPhase 3
Palazestrant and ribociclib for first-line advanced breast cancer
This trial tests a new drug (palazestrant) combined with ribociclib for people with a common type of advanced breast cancer that is estrogen receptor-positive and HER2-negative. You may qualify if you haven't had treatment for advanced disease and your cancer has either just been found or came back long after completing hormone therapy.
Beverly Hills, CaliforniaAges 18 years+ - NCT07062965RecruitingPhase 3
PF-07248144 with fulvestrant for HR+ HER2- advanced breast cancer
This trial tests a new study medicine (PF-07248144) combined with fulvestrant in people with a certain type of advanced breast cancer (HR-positive, HER2-negative) that has worsened after previous treatments. It may be an option if you've already tried a CDK4/6 inhibitor and endocrine therapy.
Camarillo, CaliforniaAges 18 years+ - NCT07029399RecruitingPhase 1
Study of NKT5097 for advanced solid tumors
This trial tests an experimental oral drug (NKT5097) for people with advanced solid tumors that have not responded to other treatments. It may also be an option for people with a specific type of breast cancer (HR+/HER2-). The goal is to see if the drug is safe and effective.
Duarte, CaliforniaAges 18 years+ - NCT06998407RecruitingPhase 1/Phase 2
Study of AVZO-023 for advanced solid tumors
This trial tests a new drug, AVZO-023, alone or with other treatments, for people with advanced solid tumors that have not responded to standard therapy. The goal is to see if it can shrink tumors or slow their growth.
Los Angeles, CaliforniaAges 18 years+ - NCT06997029RecruitingPhase 1
Study of BMS-986500 for advanced solid tumors
This trial tests a new drug called BMS-986500, alone or with other treatments, for people with advanced solid tumors that cannot be removed by surgery or have spread. It aims to see if the drug is safe and effective.
Fullerton, CaliforniaAges 18 years+ - NCT06993844RecruitingPhase 1/Phase 2
Study of ETX-636 for advanced solid tumors with PIK3CA mutation
This trial tests an experimental drug called ETX-636 in people whose cancer has a specific gene change (PIK3CA mutation) and has not responded to at least one prior treatment. The goal is to see if the drug can shrink tumors or stop them from growing.
Newport Beach, CaliforniaAges 18 years+
Advanced Breast Cancer trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting advanced breast cancer studies listed above.
- City of Hope · 4 studies
- Hoag Memorial Hospital Presbyterian · 4 studies
- UC San Diego Moores Cancer Center · 4 studies
- UCSF Helen Diller Family Comprehensive Cancer Center · 3 studies
- City of Hope Orange County Lennar Foundation Cancer Center · 2 studies
- Los Angeles Cancer Network · 2 studies
- Marin Cancer Care · 2 studies
- Stanford Cancer Institute · 2 studies
What taking part in a advanced 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.
Advanced Breast Cancer trials in other states
Common questions
- Are there advanced breast cancer clinical trials in California?
- Yes. We're currently tracking 153 recruiting advanced 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 advanced 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 advanced 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 advanced 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.