The short answer
Finding a clinical trial takes four steps: gather the details of your cancer (type, stage, prior treatments), search a trial database like NCI's find-a-trial tool or ClinicalTrials.gov, review each trial's eligibility criteria, and contact the trial team. NCI's helpline at 1-800-4-CANCER can search with you for free, and your oncologist should be part of the decision.
Ask your oncologist first: 'Would a clinical trial be right for me?' — doctors often know of trials, and trials are an option at many points in care, not a last resort.
Before searching, gather your details: exact cancer type, stage, biomarker or genetic test results, prior treatments, age, and general health.
NCI's clinical trials search at cancer.gov covers NCI-supported cancer trials; ClinicalTrials.gov lists studies across diseases run worldwide.
NCI's Cancer Information Service (1-800-4-CANCER, 1-800-422-6237) will search for trials with you by phone, free.
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The full explanation.
The simple version
Clinical trials are how new cancer treatments prove themselves. Joining one can give you access to approaches that are not yet widely available, with careful monitoring along the way. But finding the right trial can feel like searching a haystack. It gets manageable when you break it into four steps: gather your details, search, check eligibility, and make contact.
One idea worth carrying in: trials are not a last resort. There are trials for newly diagnosed patients, for people mid-treatment, for survivors, and for prevention. If you're curious, the time to ask is now, whatever stage you're at. (New to the idea? Start with What Are Clinical Trials?.)
Finding a trial is a four-step process — and free help exists at every step.
Step 1: Gather your cancer details
Trial eligibility turns on specifics. Collect them before you search:
- your exact cancer type and subtype
- your stage, and where the cancer has spread if it has
- biomarker, genetic, or molecular test results — from your pathology report (HER2, EGFR, PD-L1, MSI status and similar markers more and more decide which trials fit)
- treatments you've already had, including dates
- your age and general health, and other conditions you have
Most of this sits in your pathology report and treatment summary. Your care team can help you pull it together. And asking your oncologist "Would a clinical trial be right for me?" is the single best first move, since doctors often know of trials that fit.
Step 2: Search
Free, reliable places to look:
- NCI's clinical trials search (cancer.gov) — covers NCI-supported cancer trials across the country. You can filter by cancer type, age, and location.
- ClinicalTrials.gov — the NIH registry of clinical studies run around the world. It is broader than cancer. Every legitimate U.S. trial should appear here with a study number (like NCT01234567). That number is handy when you discuss a specific trial with your doctor.
- NCI's Cancer Information Service — 1-800-4-CANCER (1-800-422-6237) — a trained specialist will search with you by phone and send you the results. It is free, and it helps a lot if the databases feel overwhelming.
- Cancer center websites — major centers, including NCI-designated cancer centers, list their open trials.
- Advocacy groups for your cancer type — many run trial-matching services with real humans on the other end.
Step 3: Check eligibility
Every trial listing includes eligibility criteria — who can join and who can't. These rules protect participants and keep the science valid. Compare each promising trial against your details from Step 1. Then shortlist the ones that could plausibly fit.
Two things should not put you off. First, the criteria are written in dense medical language, and your care team can translate them. Second, not qualifying for a trial says nothing about your prognosis. It usually just means the study needs a different situation than yours.
Step 4: Contact the trial team
Each listing includes a contact, usually a research coordinator or nurse. When you call or email:
- give a short summary of your details from Step 1
- ask whether you'd plausibly qualify before you book a screening visit
- ask what taking part involves: visits, tests, time, and travel
- ask about costs: research costs (study drug, study-specific tests) are usually covered by the study, while routine care usually bills to your insurance. Most plans and Medicare cover routine costs in approved trials, but confirm both sides
- ask whether help with travel or lodging exists
Then bring what you learn back to your own oncologist. Deciding to join is a treatment decision like any other. Weigh it with your team. And know that consent keeps going: you can leave a trial at any time, for any reason. For what enrollment itself looks like, see Joining a Clinical Trial.
The takeaway
Gather your details. Search NCI's tool and ClinicalTrials.gov, or let 1-800-4-CANCER search with you. Match yourself against the eligibility criteria. Then call the coordinators. It's homework, but it's very doable homework. And it can open doors that don't appear on a standard treatment menu.
Words to know
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Common questions
Where do I search for cancer clinical trials?
Two main free tools: NCI's find-a-trial search at cancer.gov (NCI-supported cancer trials, searchable by cancer type, age, and location) and ClinicalTrials.gov, the NIH registry of studies. You can also call NCI's Cancer Information Service at 1-800-4-CANCER (1-800-422-6237), where a specialist will search with you, and many cancer centers list their open trials on their own websites.
What information do I need before searching?
The details that determine eligibility: your exact cancer type and subtype, stage, any biomarker or genetic test results (from your pathology report), treatments you've already had, your age, and your general health. Your care team can help you assemble this — much of it is in your pathology report and treatment summary.
What are eligibility criteria?
Rules about who can join a study — often based on cancer type and stage, prior treatments, biomarkers, age, and overall health. They exist to keep participants safe and make results meaningful. If you don't qualify for one trial, others may fit, and not qualifying says nothing about your outlook.
Do I have to travel to join a trial?
Not always. Trials run at hospitals and clinics across the country — search tools let you filter by distance. Larger or newer studies may only run at big centers, but some visits can sometimes be done locally, and some programs help with travel and lodging costs. Ask each trial's coordinator.
Who pays for care in a clinical trial?
Generally there are two kinds of costs: research costs (the study drug and study-specific tests), usually covered by the trial sponsor, and routine patient care costs, usually billed to your insurance. Most insurance plans and Medicare cover routine costs in approved trials. Confirm the specifics with the trial team and your insurer before enrolling.
What should I ask the trial team when I contact them?
Ask what the study is testing and what phase it is, what would be required of you (visits, tests, time), the possible benefits and risks, whether you could get a placebo, which costs are covered, whether travel help exists, and whether you can leave the study at any time (you always can). Bring the answers back to your own oncologist to discuss the fit.
Questions to ask your doctor
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Last updated: 2026-08-05Next planned review: 2027-01-04
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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