The short answer
An Institutional Review Board (IRB) is an independent committee that reviews and monitors clinical trials to protect the rights and safety of the people who take part.
An IRB is an independent committee that oversees clinical trials.
Its main job is to protect the safety and rights of participants.
It reviews a trial before it can begin.
It checks that risks are reasonable and consent is clear.
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An independent watchdog
An Institutional Review Board, or IRB, is an independent committee that reviews clinical trials. Its purpose is to protect the people who take part. Federal rules require at least five members. They include at least one scientist, at least one person who is not a scientist, and at least one person with no connection to the site where the trial takes place. The board looks out for participants, not for the researchers or the sponsor.
Reviewing before a trial starts
Before a trial can enroll anyone, the IRB reviews the plan. It asks whether the possible risks are reasonable next to the possible benefits. It checks that the informed consent form explains things clearly and honestly. It also checks that participants' rights and privacy are protected. If a study pays participants, FDA guidance says the board should make sure the payment does not pressure people into joining.
Watching while it runs
The IRB's role does not end at approval. NCI says IRBs review trial plans yearly. An IRB can change the plan, or even stop the trial, if that is needed to protect the people enrolled.
The IRB is not the only check. Many larger trials, especially phase 3 trials, also have a data and safety monitoring board. That is a separate group of doctors, statisticians, and other experts who watch the results as they build up. NCI says these boards are especially common in phase 3 trials. The U.S. Food and Drug Administration also oversees IRBs and inspects them for compliance.
Why it matters to you
The IRB is a main reason you can trust that a trial was checked independently for safety and fairness before anyone asked you to join. If you have questions about your rights as a participant, ask the study team how to reach the board.
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Common questions
What is an IRB?
An Institutional Review Board is an independent committee — including scientists, doctors, and community members — that reviews clinical trials to make sure they are ethical and protect participants.
What does the IRB check?
It reviews whether the risks are reasonable compared with possible benefits, whether the informed consent is clear and honest, and whether participants' rights and privacy are protected.
Does the IRB keep watching during the trial?
Yes. The IRB does not just approve a trial once. It continues to monitor the study and can require changes or halt it if concerns arise.
Why does the IRB matter to me?
The IRB is one of the main safeguards that a trial has been independently reviewed for safety and fairness before you are ever asked to join.
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Written by: Cancer ExplainedSources last checked: 2026-10-02 what this meansLast updated: 2026-10-02Next planned review: 2027-01-14
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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, and this 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 then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. 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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