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 and Phase 3 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT06545331RecruitingPhase 1
A study of XB010 for advanced solid tumors
This trial tests an investigational drug called XB010 for people with solid tumors that have spread or cannot be removed by surgery. It aims to see if XB010 is safe and effective for several cancer types, including lung, breast, head and neck, and esophageal cancers.
Irvine, CaliforniaAges 18 years+ - NCT06533826RecruitingPhase 2
Testing two antibody drugs for HER2-low breast cancer
This trial tests two antibody-drug conjugates (Enhertu and Datroway) for breast cancer that is HER2-low or HER2-0. It aims to find the best treatment sequence for people whose cancer has stopped responding to prior therapy.
San Francisco, CaliforniaAges 18 years+ - NCT06500169Recruiting
Golf exercise study for prostate cancer survivors
This study tests if golf can help men with prostate cancer feel better and stay healthy. It's for men who are on hormone therapy and want to try a gentle, fun exercise.
Los Angeles, CaliforniaAges 55–85 - NCT06458036RecruitingPhase 2
Selpercatinib before radioactive iodine for RET-positive thyroid cancer
This study tests whether a targeted drug called selpercatinib, taken before radioactive iodine therapy, can help treat thyroid cancer in children and young adults who have a specific genetic change (RET fusion or mutation). The drug may make the cancer more sensitive to the radioactive iodine treatment that follows.
San Francisco, CaliforniaAges 2–25 - NCT05216432RecruitingPhase 1
RLY-2608 for PIK3CA-mutant advanced solid tumors and breast cancer
This early study (Phase 1) tests RLY-2608, a targeted cancer drug for tumors with a PIK3CA mutation. It studies the drug alone and combined with hormone therapy (and sometimes CDK4/6 or CDK4 medicines) to see safety, dose, and whether it can shrink tumors.
San Diego, CaliforniaAges 18 years+ - NCT06314958Recruiting
Follow-up after colorectal cancer treatment
This study follows people who have finished treatment for stage II (high-risk) or stage III colorectal cancer and are now cancer-free. Researchers want to learn more about which factors might predict if the cancer will come back, so they can better personalize follow-up care.
Monrovia, CaliforniaAges 18 years+ - NCT06287775RecruitingPhase 1/Phase 2
Testing a new drug combo for small cell lung cancer
This trial tests adding a new drug, iadademstat, to standard immunotherapy drugs (atezolizumab or durvalumab) for people with small cell lung cancer that responded to initial treatment. The goal is to see if this combination works better at preventing cancer from returning.
Duarte, CaliforniaAges 18 years+ - NCT06178354Recruiting
Freezing or ultrasound for early prostate cancer
This trial is testing whether freezing (cryotherapy) or using high-frequency ultrasound (HIFU) to destroy only the cancer spots in the prostate is safe and effective for men with early-stage prostate cancer. It's a less invasive option that targets just the tumor, not the whole prostate.
Sacramento, CaliforniaAges 18 years+ - NCT06096844RecruitingPhase 3
Chemotherapy plus immunotherapy vs. immunotherapy alone for older adults with lung cancer
This study compares getting both chemotherapy and immunotherapy versus immunotherapy alone for older adults with advanced lung cancer. The goal is to see which approach is more effective and tolerable for people aged 70 and older.
Dublin, CaliforniaAges 70 years+ - NCT06101277Recruiting
Local therapy for limited new cancer growth in digestive cancers
This trial tests a cancer treatment that uses local therapies (like radiation or targeted heat) to destroy a small number of growing spots. It is for people with certain gastrointestinal cancers whose main treatment is working well except for a few new spots, so they can avoid switching to a different drug right away.
Sacramento, CaliforniaAges 18 years+ - NCT06072612RecruitingPhase 3
Bria-IMT plus CPI vs standard care for advanced breast cancer
This trial tests a new combination of two immunotherapy drugs (Bria-IMT and a checkpoint inhibitor) against your doctor's choice of standard treatments. It is for people with advanced breast cancer that has spread and who have already tried several prior therapies.
Los Angeles, CaliforniaAges 18 years+ - NCT06067269RecruitingPhase 2
Hormone therapy and precise radiation for intermediate-risk prostate cancer
This trial tests whether giving a short course of hormone therapy (apalutamide) along with targeted, high-dose radiation (SBRT) is safe and effective for men with a specific type of intermediate-risk prostate cancer. You may benefit if you fit the exact risk and test criteria.
Los Angeles, CaliforniaAges 18 years+ - NCT05783323RecruitingPhase 2
Larotrectinib plus radiation for thyroid cancer with NTRK fusion
This Phase 2 trial tests larotrectinib (a targeted medicine) to help radioactive iodine (RAI) work better in people with differentiated thyroid cancer that has an NTRK gene fusion. It may improve how much thyroid cancer the RAI can reach and shrink.
San Francisco, CaliforniaAges 2–99 - NCT06022029RecruitingPhase 1
Study of injected ONM-501 alone or with cemiplimab for advanced cancers
This trial tests an injected study drug (ONM-501) alone or with another drug (cemiplimab) for people with advanced solid tumors or lymphomas that haven't responded to other treatments. It aims to find a safe dose and see if the combination helps shrink or control the cancer.
Los Angeles, CaliforniaAges 18 years+ - NCT05786924RecruitingPhase 1/Phase 2
Targeted cancer drug study for RAS/RAF mutation-positive tumors
This Phase 1/2 study tests S241656 (a targeted cancer medicine) in people whose cancers have certain “RAS/RAF” gene changes. It may help shrink tumors or control cancer growth, and also finds the safest dose and best way to use the drug.
Los Angeles, CaliforniaAges 18 years+ - NCT05595499RecruitingPhase 2
Fisetin for better walking and strength in breast cancer survivors
This study tests whether fisetin (a natural compound) can improve physical function, like walking ability, in breast cancer survivors who feel frail. It may help strengthen muscles and improve daily activity after treatment.
Alhambra, CaliforniaAges Any age - NCT03422198RecruitingPhase 3
Short course vaginal radiation after hysterectomy
This trial tests a short course of targeted vaginal radiation (brachytherapy) after surgery for certain early endometrial cancer. It may help prevent the cancer from coming back in the vaginal area after the uterus has been removed.
Palo Alto, CaliforniaAges Any age - NCT05524584RecruitingPhase 2
Anastrozole, fulvestrant, and abemaciclib for hormone-positive breast cancer
This trial tests whether combining three medicines can better control hormone-receptor–positive, HER2-negative metastatic breast cancer that cannot be cured with surgery or radiation. It may help shrink tumors and slow disease growth compared with standard hormone therapy approaches.
Orange, CaliforniaAges 18 years+ - NCT05372640RecruitingPhase 1
Drug combo trial for rare cancers with shared NUT features
This Phase 1 trial tests the safety and early signs of effectiveness of combining two anti-cancer drugs (ZEN003694 and abemaciclib) in teens and adults with metastatic or unresectable NUT carcinoma, breast cancer, and other solid tumors. It may help by finding a safer dose and whether the drug combination can shrink or control tumors that do not respond to standard treatments.
Los Angeles, CaliforniaAges 12 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+ - NCT05297734Recruiting
Study compares two cancer support care plans
This study tests two different ways of providing supportive care for adults with cancer to see which one works better. It may help improve comfort, support, and care coordination during treatment.
Monterey, CaliforniaAges 18 years+ - NCT05113537RecruitingPhase 1/Phase 2
Abemaciclib before PSMA cancer therapy for advanced prostate cancer
This trial tests whether taking abemaciclib before a PSMA-targeted radioligand can help people with advanced, treatment-resistant prostate cancer. The goal is to improve how well the PSMA therapy works while staying safe.
San Francisco, CaliforniaAges 18 years+ - NCT04267848RecruitingPhase 3
Testing immunotherapy with chemo after lung cancer surgery
This trial tests whether adding an immunotherapy medicine to standard chemotherapy after surgery can improve outcomes for some people with non-small cell lung cancer. It may help by boosting the immune system to reduce the chance the cancer comes back.
Redding, CaliforniaAges 18 years+ - NCT03808337RecruitingPhase 2
SBRT radiation plus standard treatment for spread cancer
This trial looks at adding a focused radiation treatment called SBRT to standard care for cancers that have spread to a limited number of spots. It aims to control those spread-out tumors while still using the usual cancer treatment plan.
San Carlos, CaliforniaAges 18 years+
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 · 5 studies
- University of California, Davis · 4 studies
- University of California, San Francisco · 3 studies
- USC Norris Comprehensive Cancer Center · 3 studies
- City of Hope at Irvine Lennar · 2 studies
- City of Hope South Pasadena · 2 studies
- City of Hope Upland · 2 studies
- Kaiser Permanente Downtown Commons · 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.