Clinical trials · California
Cancer clinical trials in California
We’re tracking 1,320 recruiting cancer studies with a site in California — including Phase 1, Phase 1/Phase 2, Phase 2, Phase 3 and Phase 4 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT05902507Recruiting
MRI guidance during breast cancer radiation treatment
This trial studies using MRI images to help plan and guide radiation therapy after breast-conserving surgery. It may help doctors target the right area more accurately while keeping treatment standard and safe.
San Francisco, 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.
San Francisco, CaliforniaAges 18–60 - NCT05882058RecruitingPhase 2
Dose test of a DLL3 cancer drug for neuroendocrine tumors
This Phase 2 study tests how different doses of BI 764532 affect people with small cell lung cancer or certain other neuroendocrine cancers. It may help shrink tumors and improve symptoms after standard treatments have stopped working.
San Francisco, CaliforniaAges 18 years+ - 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.
Corona, CaliforniaAges 18 years+ - NCT05874921Recruiting
Registry for adults with UTUC treated with Jelmyto
This registry collects information about adults with upper tract urothelial cancer (UTUC) who received Jelmyto after it was approved. It helps doctors understand outcomes and real-world experience with Jelmyto.
Santa Monica, CaliforniaAges 18 years+ - NCT05856773RecruitingPhase 3
Comparing two proton therapy schedules for breast cancer
This trial compares two ways of giving proton therapy to the breast or chest wall and nearby lymph nodes after surgery. The goal is to see if a shorter course of treatment works just as well as the standard longer course, while possibly reducing side effects.
San Diego, CaliforniaAges 19 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 - NCT05832086RecruitingPhase 2
Fasting-mimicking diet to improve prostate cancer and metabolism
This trial tests whether an intermittent, fasting-like diet can help control metastatic prostate cancer and improve metabolic health in men on hormone therapy. Participants follow a specific diet plan and are monitored by the study team.
Duarte, CaliforniaAges Any age - NCT05805371RecruitingPhase 1
PSCA CAR-T cells with or without radiation for prostate cancer
This Phase 1 study tests a prostate cancer treatment made of PSCA-targeted CAR-T cells, with or without radiation, to help control advanced prostate cancer. It aims to find a safe treatment approach and see how well it works in people whose cancer has PSCA.
Duarte, CaliforniaAges 18 years+ - NCT05803941RecruitingPhase 4
Study long-term safety of a prostate cancer drug
This trial checks the long-term safety (how it affects you over time) of lutetium-177 vipivotide tetraxetan in people with prostate cancer. You may be eligible if you already received the related drug in a prior Novartis prostate cancer study and can complete the required follow-up tests.
Orange, CaliforniaAges 18–100 - NCT05797168RecruitingPhase 1/Phase 2
Early study drug for advanced solid tumors, alone or with another drug
This Phase 1/2 study tests a new AstraZeneca cancer drug (AZD5335) to see how safely it can be given and how well it works in people with advanced solid tumors. You may get it alone or with another treatment, and you’ll need to provide tumor information (sometimes including a biopsy) for study planning.
Duarte, CaliforniaAges 18–130 - NCT05804318Recruiting
Adaptive daily radiation for low- and intermediate-risk prostate cancer
This trial tests a radiation plan that is adjusted every day using your own scans to better target prostate cancer. It may help reduce side effects while still treating the cancer effectively in men with lower- or intermediate-risk disease.
Irvine, CaliforniaAges 18 years+ - NCT05764720Recruiting
Personalized targeted radiation for borderline pancreatic cancer
This study tests a personalized form of stereotactic radiation therapy (high-precision radiation planned to fit your tumor) after you’ve had some chemotherapy. It aims to treat pancreatic tumors while limiting exposure to nearby healthy organs.
Duarte, CaliforniaAges 18 years+ - NCT05443737RecruitingPhase 3
Telehealth care to protect fertility in young people with cancer
This trial tests a telehealth (video/phone) program that helps adolescents and young adults with cancer plan for future fertility. It may help you get support and options for preserving your ability to have children before cancer treatment affects it.
El Centro, CaliforniaAges birth–50 years - NCT05761782Recruiting
Cancer awareness training for underserved communities
This study aims to provide cancer awareness training and education to people living in the UC Davis Comprehensive Cancer Center's catchment area, which includes diverse and underserved communities. The goal is to increase cancer knowledge and promote early detection.
Sacramento, CaliforniaAges 18–80 - NCT05775471RecruitingPhase 2
Check PD-1 plus enfortumab after kidney-urine-duct surgery
This Phase 2 study tests giving pembrolizumab (an immune therapy) and enfortumab vedotin (an antibody-drug medicine) before and after surgery to remove high-risk upper urinary tract cancer. The goal is to lower the chance the cancer comes back.
Los Angeles, CaliforniaAges 18 years+ - NCT05751434RecruitingPhase 2
Exercise therapy for prostate cancer patients on active surveillance
This trial tests whether an exercise program can help men with early-stage prostate cancer who are being monitored instead of treated. If you are not very active now, you may be able to join a structured exercise plan to see if it improves your health and cancer signs.
Los Angeles, CaliforniaAges 18 years+ - NCT05711615RecruitingPhase 1
Low-dose doxorubicin plus peposertib for advanced sarcoma
This Phase 1 trial tests a low dose of a common chemotherapy (liposomal doxorubicin) together with an anti-cancer drug called peposertib. It’s for people with advanced sarcoma that can’t be cured, aiming to find a safe dosing plan and see how well the treatment might work.
Los Angeles, CaliforniaAges 18 years+ - NCT05710848RecruitingPhase 1/Phase 2
Study drug for repeat bladder tumor surgery patients
This trial tests STM-416, given around the time you have surgery to remove recurring bladder tumors, to see if it can reduce the chance the cancer comes back. It is for people with high-risk early bladder cancer (non–muscle-invasive) who have already had standard treatment and now need another TURBT.
Bakersfield, CaliforniaAges 18 years+ - NCT05741242Enrolling by invitationPhase 1/Phase 2
Vaccine trial using customized immune targets for solid tumors
This trial tests a personalized cancer vaccine made from synthetic long peptide “neoantigens,” aiming to be safe and help the immune system fight certain solid tumors. It may fit people with pancreatic cancer after starting first-line chemotherapy, and some other solid tumors with limited options.
San Francisco, CaliforniaAges 12 years+ - NCT05696626RecruitingPhase 3
Test a new pill plus abemaciclib versus standard therapy
This Phase 3 study compares lasofoxifene plus abemaciclib versus fulvestrant plus abemaciclib for ER-positive, HER2-negative breast cancer that has an ESR1 mutation. It looks for better tumor control in people whose cancer has progressed on hormone therapy (an aromatase inhibitor) and who meet specific safety and testing requirements.
Santa Rosa, CaliforniaAges 18 years+ - NCT05677490RecruitingPhase 3
Chemotherapy with or without immunotherapy for advanced stomach or esophagus cancer
This trial compares two chemotherapy combinations, with or without an immunotherapy drug called nivolumab, for people with advanced stomach, esophagus, or gastroesophageal junction cancer that cannot be removed by surgery. The goal is to see which treatment works better and if adding immunotherapy helps.
Antioch, CaliforniaAges 18 years+ - NCT05708352RecruitingPhase 2
Ketogenic diet vs usual diet guidance for newly diagnosed glioblastoma
This trial tests whether a very low-carb, high-fat ketogenic diet helps people with newly diagnosed glioblastoma when combined with standard cancer treatment. You would compare this special diet guidance to the usual anti-cancer diet guidance while receiving the same standard-of-care treatments.
Santa Monica, CaliforniaAges 18 years+ - NCT05645536Enrolling by invitationPhase 3
Safety follow-up for hormone-positive, HER2-negative breast cancer
This trial studies the safety of continuing endocrine therapy with ovarian suppression (for women) after you finish the earlier OVELIA study. It may help doctors confirm that the treatment remains safe for longer-term use.
Greenbrae, CaliforniaAges 18–51
Cancer trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting cancer studies listed above.
- City of Hope · 6 studies
- Cedars-Sinai Medical Center · 3 studies
- Los Angeles General Medical Center · 3 studies
- Palo Alto Medical Foundation · 3 studies
- Providence Saint Joseph Medical Center/Disney Family Cancer Center · 3 studies
- University of California, San Francisco · 3 studies
- USC Norris Comprehensive Cancer Center · 3 studies
- Alta Bates Summit Medical Center-Herrick Campus · 2 studies
What taking part in a 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.
Cancer trials in other states
Common questions
- Are there cancer clinical trials in California?
- Yes. We're currently tracking 1,320 recruiting 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 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 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 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.