Clinical trials
Unknown Primary Tumors clinical trials
Below are recruiting unknown primary tumors clinical trials, each written for real people, not researchers. We’re tracking 29 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06140992Recruiting
A trial to classify cancer of unknown primary
This trial is for people whose cancer started in an unknown place (cancer of unknown primary). It uses a special test called PaCIFiC-CUP to help classify the cancer, which may guide better treatment choices.
Guangzhou, GuangdongAges 18–80 - NCT02012699Recruiting
Cancer registry for people with or at risk of cancer
This trial collects health information and samples (a “cancer repository”) to help researchers study cancer and cancer risk. You may be able to join if you’ve had cancer before or if you’re at higher risk or have concerning findings.
Greenwood Village, ColoradoAges 19–110 - NCT07761429RecruitingPhase 2/Phase 3
Study of a new drug with chemo for cancer of unknown primary
This trial tests a new drug (F520) combined with two chemotherapy drugs for people whose cancer started in an unknown place in the body. It aims to see if the combination shrinks tumors and is safe.
Shanghai, Shanghai MunicipalityAges 18–75 - NCT06644716Recruiting
FAPI PET-CT scan to find unknown primary cancer
This study tests a new type of PET-CT scan using a tracer called FAPI to find the original source of cancer when standard tests have not been able to. It may help identify the primary tumor in people with cancer that has spread from an unknown location.
AmsterdamAges 18–99 - NCT07524114Recruiting
Blood test to find leftover cancer after treatment
This study uses a blood test to look for tiny bits of cancer DNA after you finish treatment. It may help doctors know if cancer is still there and guide next steps.
Toronto, OntarioAges 18 years+ - NCT04273061RecruitingPhase 2
Atezolizumab for tumors that look sensitive on DNA/RNA testing
This Phase 2 study tests atezolizumab, an immunotherapy drug, in people with advanced, incurable solid tumors whose tumor DNA/RNA suggests they may respond. The goal is to see if the treatment works better for patients selected by these lab results.
Vancouver, British ColumbiaAges 18 years+ - NCT05046444Recruiting
Testing tricky blood cancer diagnoses with advanced DNA sequencing
This study uses advanced DNA sequencing to figure out unclear or unusual blood (hematologic) conditions when standard tests are not enough. It may help your care team reach a more accurate diagnosis by better understanding what’s driving your illness.
MunichAges 18–99 - NCT05576974RecruitingPhase 2
Test a dye used during surgery to find head and neck cancer
This trial tests whether a single dose of an imaging dye (given during surgery) can help doctors find the unknown origin of head and neck cancer and check safety. It may help guide surgery and biopsies when the primary cancer location hasn’t been identified.
Dallas, TexasAges 18–99 - NCT05918510Recruiting
Blood and tumor study for virus markers in throat cancer
This study looks at virus-related markers and tiny gene regulators (microRNAs) in tumor tissue from people with certain throat cancers caused by human papilloma virus (HPV). It’s observational, meaning it does not change your treatment, but results may help doctors better understand these cancers and how they behave.
RomeAges 18 years+ - NCT07061080RecruitingPhase 2
Tarlatamab for advanced digestive neuroendocrine cancer
This trial tests a new drug called Tarlatamab for people with advanced neuroendocrine carcinoma (a rare and aggressive cancer) of the digestive system that has stopped responding to prior chemotherapy. The drug targets a protein called DLL3 found on some tumors, and researchers hope it can shrink or slow tumor growth.
Brest, BrestAges 18 years+ - NCT06638931RecruitingPhase 2
Nivolumab for rare solid tumors with high PD-L1
This trial is testing a drug called Nivolumab (an immunotherapy) for people with rare solid tumors that have high levels of PD-L1. It might be an option if you have tried other treatments and they stopped working or caused too many side effects.
Fortaleza, CearáAges 18 years+ - NCT07283939Recruiting
Testing a tool to adjust chemo doses and reduce treatment delays
This trial tests a computer algorithm called PAGODA that helps doctors adjust chemotherapy doses for people with gastrointestinal cancers. The goal is to prevent unplanned treatment delays while keeping the treatment effective.
Fairbanks, AlaskaAges 18 years+ - NCT06589804RecruitingPhase 3
Testing cetuximab plus pembrolizumab for advanced head and neck cancer
This trial tests whether adding cetuximab to the standard drug pembrolizumab works better for head and neck cancer that has spread or come back after treatment. It is for people whose cancer did not respond to platinum chemotherapy and whose tumors have a certain immune marker (PD-L1).
Little Rock, ArkansasAges 18 years+ - NCT04754321RecruitingPhase 1
Test immunotherapy with salvage surgery and IORT for head and neck cancer
This Phase 1 trial tests a new plan that combines immunotherapy with surgery, plus a targeted radiation treatment called IORT. It is for people whose head and neck squamous cell cancer has come back or never fully went away and can be operated on. The goal is to shrink or control the cancer and see how safe the approach is.
Columbus, OhioAges 18 years+ - NCT05172245RecruitingPhase 1
Testing a new drug added to chemoradiation for head and neck cancer
This study tests whether adding a new targeted drug called ipatasertib to standard chemoradiation can improve treatment for people with locally advanced head and neck cancer. Ipatasertib may help block a protein that helps cancer grow, possibly making the standard therapy more effective.
Tampa, FloridaAges 18 years+ - NCT06662058Recruiting
Remote hearing test for head and neck cancer patients on cisplatin or radiation
This study tests a remote hearing test to monitor hearing changes in patients with head and neck cancer getting cisplatin chemotherapy and/or radiation. The goal is to catch hearing loss early so treatment can be adjusted.
Atlanta, GeorgiaAges 18 years+ - NCT03740503Recruiting
Study genes in people who respond unusually to treatment
This study looks at stored tumor samples to understand why some people respond much better or much worse than expected. The goal is to learn what the tumor’s genes might be telling doctors about response to treatment.
Toronto, OntarioAges 18 years+ - NCT04325425RecruitingPhase 2
First chemotherapy for metastatic aggressive neuroendocrine cancer
This Phase 2 study tests a chemotherapy approach in people with metastatic grade 3 (high-grade) neuroendocrine cancer or a related rare mixed tumor. It may help shrink tumors and control disease when standard first treatments have not yet been given.
CaenAges 18 years+ - NCT04475640Recruiting
Genetic testing study for cancer patients in different ethnic groups
This study looks at cancer-related inherited gene changes using blood samples. It may help patients and doctors understand cancer risk and guide treatment planning, especially across different ethnic communities.
Scottsdale, ArizonaAges 18 years+ - NCT04504604Recruiting
Study matching rare cancer care with tumor DNA testing
This study looks at people with rare solid tumors or lymphoma to understand their cancer’s genetic changes. It collects blood and existing tissue samples (from standard care) for DNA testing and gathers health information to help improve knowledge about rare cancers.
Cambridge, MassachusettsAges 18 years+ - NCT06868433RecruitingPhase 1
TMV vaccine alone or with pembrolizumab for advanced HNSCC
This trial tests a vaccine made from your own tumor to help your immune system fight head and neck cancer that has returned or spread. It is given alone or with an immunotherapy drug (pembrolizumab) to see if it can shrink tumors or slow progression.
Atlanta, GeorgiaAges 18 years+ - NCT02906943Recruiting
Testing cancer tissue to guide targeted treatment choices
This trial studies advanced solid tumors by using stored tumor samples to look for molecular clues. The goal is to help doctors better choose cancer treatments that may work for your specific tumor.
Hamilton, OntarioAges 18 years+ - NCT07512921Recruiting
Gene Expression Study for HPV-Negative Head and Neck Cancer
This study compares gene patterns in tumor tissue and blood samples from patients with HPV-negative head and neck cancer. Understanding these patterns may help doctors better understand the disease and develop better treatments.
MilanAges 18 years+ - NCT06843096Enrolling by invitation
Special mammogram for finding breast cancer when origin is unknown
This trial uses a special mammogram with contrast dye to look for breast cancer in people who have cancer that started somewhere unknown (called Cancer of Unknown Primary). It may help find if the breast is the source, which could guide treatment.
RomeAges 18 years+
Hear when a new Unknown Primary Tumors trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.
Common questions
- Are there clinical trials for unknown primary tumors?
- Yes. Clin2 currently lists 29 recruiting unknown primary tumors studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a unknown primary tumors trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a unknown primary tumors trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
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.