Clinical trials · California
HER2 + Breast Cancer clinical trials in California
We’re tracking 119 recruiting her2 + breast cancer studies with a site in California — including Phase 1, Phase 2, Phase 2/Phase 3 and Phase 3 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT05274048RecruitingPhase 1
Neratinib plus antibody-drug for HER2-positive stomach or esophagus cancer
This early-phase trial tests neratinib together with an antibody-drug to treat advanced HER2-positive gastro-esophageal (stomach/esophagus) cancer that can’t be removed by surgery. It’s for people whose cancer has progressed after at least one HER2-targeted treatment, aiming to shrink tumors and improve outcomes.
Palo Alto, CaliforniaAges 18 years+ - NCT05879926RecruitingPhase 3
Testing chemo after hormone therapy in premenopausal early breast cancer
This Phase 3 trial checks whether adding chemotherapy after standard hormone-blocking treatment works better for some premenopausal women with early-stage, ER-positive, HER2-negative breast cancer. It targets patients with limited lymph node spread and a lower-to-intermediate tumor “recurrence” risk score.
Anaheim, CaliforniaAges 18–60 - 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+ - NCT07173751RecruitingPhase 3
Pumitamig for advanced triple-negative breast cancer
This study tests a new drug called pumitamig for people with a type of breast cancer that is triple-negative or has very low hormone receptors and has come back or spread. It aims to see if pumitamig works better than standard treatment and how safe it is for people who cannot get PD(L)-1 immunotherapy with chemo.
La Jolla, CaliforniaAges 18 years+ - NCT04282044RecruitingPhase 1
CRX100 drug trial for advanced cancers with or without pembrolizumab
This Phase 1 trial tests CRX100 (a new cancer medicine) alone and with pembrolizumab (an immune checkpoint drug) in people with advanced solid tumors. It’s mainly designed to check safety and side effects, and to see whether tumors respond, potentially helping people whose cancer has come back or stopped responding to standard treatment.
Stanford, CaliforniaAges 18 years+ - NCT05633654RecruitingPhase 3
Test drug combo versus standard care for triple-negative breast cancer
This trial tests a cancer antibody-drug combination plus pembrolizumab (immunotherapy) versus standard treatment. It’s for people with triple-negative breast cancer that still has invasive disease in the breast or lymph nodes after surgery and chemotherapy before surgery.
Berkeley, CaliforniaAges 18 years+ - NCT06966700RecruitingPhase 3
Study of Sac-TMT in Early High-Risk Breast Cancer
This study tests a new drug called Sacituzumab Tirumotecan (Sac-TMT) for people with early-stage, high-risk breast cancer that hasn't spread. The drug is given before surgery to see if it can shrink tumors and improve outcomes.
Burbank, 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+ - NCT07060807RecruitingPhase 3
Study of Patritumab Deruxtecan for Advanced HR+/HER2- Breast Cancer
This trial tests a new drug called patritumab deruxtecan (a targeted therapy) for people with a common type of advanced breast cancer (HR+/HER2-). It's for those whose cancer has grown despite treatment with a CDK4/6 inhibitor plus hormone therapy.
Los Angeles, CaliforniaAges 18 years+ - NCT06312176RecruitingPhase 3
Study of new drugs for HR+/HER2- advanced breast cancer
This trial tests two new drugs (sacituzumab tirumotecan and pembrolizumab) against standard treatments for a type of advanced breast cancer that is hormone receptor positive and HER2 negative. It's for people whose cancer has worsened despite hormone therapy with a CDK4/6 inhibitor.
Fullerton, CaliforniaAges 18 years+ - NCT05307705RecruitingPhase 1
Testing LOXO-783 for PIK3CA-mutated cancers
This trial tests an experimental drug (LOXO-783) for people with advanced breast cancer or other solid tumors that have a specific change in the PIK3CA gene. The goal is to see if the drug can shrink or slow the growth of the cancer.
Los Angeles, CaliforniaAges 18 years+ - NCT06452277RecruitingPhase 3
Testing sevabertinib for advanced HER2-mutated lung cancer
This trial compares a new targeted drug called sevabertinib against standard chemotherapy plus immunotherapy for people with advanced non-small cell lung cancer that has a specific HER2 gene mutation. The goal is to see if sevabertinib works better and is safe.
Newport Beach, CaliforniaAges 18 years+ - NCT06926868RecruitingPhase 2/Phase 3
Study of a new drug versus chemotherapy for advanced triple-negative breast cancer
This trial tests a new investigational drug called izalontamab brengitecan against standard chemotherapy for people with advanced triple-negative breast cancer who cannot receive immunotherapy. The goal is to see if the new drug works better at shrinking or slowing the cancer.
Cerritos, CaliforniaAges 18 years+ - NCT07046923RecruitingPhase 1
A study of LY4175408 for advanced cancer
This trial tests a new targeted drug (LY4175408) for people with certain advanced solid tumors (lung, endometrial, or triple negative breast cancer) who have already tried standard treatments. The goal is to see if the drug is safe and effective.
Stanford, CaliforniaAges 18 years+ - NCT06353997RecruitingPhase 2
New immunotherapy combination before surgery for triple-negative breast cancer
This trial tests a new combination of two immunotherapy drugs (INBRX-106 and pembrolizumab) given before surgery for people with early-stage triple-negative breast cancer. The goal is to see if this treatment can shrink the tumor and improve outcomes.
Los Angeles, CaliforniaAges 18 years+ - NCT04389632RecruitingPhase 1
Sigvotatug vedotin for advanced solid tumors that spread
This early-stage study tests a drug called sigvotatug vedotin in people with advanced solid cancers that cannot be removed or have spread. It aims to see how well the treatment works and what side effects it causes.
Los Alamitos, CaliforniaAges 18 years+ - NCT05059444Recruiting
Blood test study to watch for cancer coming back
This study looks at whether blood tests can detect signs that cancer may return after curative-intent treatment. You would have blood drawn around your usual follow-up visits for up to 5 years, and your de-identified health data would be shared with study investigators.
Redwood City, CaliforniaAges 18 years+ - NCT07114601RecruitingPhase 1
Study of LY4257496 for people with GRPR-positive solid tumors
This trial tests a new drug, LY4257496, in people with certain types of cancer that have a protein called GRPR on their cells. The study aims to see if the drug can help shrink tumors or slow the cancer's growth.
Duarte, CaliforniaAges 18 years+ - NCT06581432RecruitingPhase 2
Zongertinib for advanced cancers with HER2 changes
This trial tests an experimental drug (zongertinib) for people with advanced solid tumors that have certain changes in the HER2 gene. It's for those who have already tried at least one standard treatment and need more options.
Beverly Hills, CaliforniaAges 18 years+ - NCT05408845RecruitingPhase 2
Study drug vs standard care for HER2 salivary gland cancer
This Phase 2 trial tests how well ado-trastuzumab emtansine (and compares to two standard treatment options) works for salivary gland cancers that are HER2-positive or HER2-low. It aims to see whether the study drug can control cancer better and with acceptable side effects.
Duarte, CaliforniaAges 18 years+ - NCT05372614RecruitingPhase 1
Testing trastuzumab deruxtecan and neratinib for HER2-positive cancers
This trial tests a combination of two targeted drugs, trastuzumab deruxtecan (Enhertu) and neratinib, for people with solid tumors that have a HER2 gene change. The goal is to see if the combination is safe and works well for cancers that have not responded to at least one prior treatment.
Duarte, CaliforniaAges 18 years+ - NCT06126276RecruitingPhase 2
Testing neratinib with or without palbociclib for HER2+ solid tumors
This trial tests two targeted drugs—neratinib alone or with palbociclib—for people with HER2-positive solid tumors (other than breast cancer) that have returned or not gone away. The goal is to see if blocking HER2 and CDK4/6 can shrink or slow the tumor.
Encinitas, CaliforniaAges 18 years+ - NCT05256225RecruitingPhase 3
Adding Herceptin medicines to chemo for HER2-positive endometrial cancer
This Phase 3 trial tests whether adding Herceptin Hylecta or Phesgo to standard chemotherapy works better than chemotherapy alone for HER2-positive serous endometrial cancer or carcinosarcoma. It may help by improving how well treatment controls or shrinks the cancer.
Auburn, CaliforniaAges 18 years+
HER2 + Breast Cancer trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting her2 + breast cancer studies listed above.
- City of Hope Comprehensive Cancer Center · 6 studies
- Stanford University · 6 studies
- City of Hope Orange County Lennar Foundation Cancer Center · 5 studies
- Hoag Memorial Hospital Presbyterian · 5 studies
- Providence Medical Foundation · 5 studies
- Cedars-Sinai Medical Center · 4 studies
- UC Irvine Health · 4 studies
- University of California, Irvine Medical Center / UC Irvine Health · 4 studies
What taking part in a her2 + 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.
HER2 + Breast Cancer trials in other states
Common questions
- Are there her2 + breast cancer clinical trials in California?
- Yes. We're currently tracking 119 recruiting her2 + 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 her2 + 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 her2 + 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 her2 + 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.