The short answer
A pathogenic variant is a harmful change in a gene that raises cancer risk. A likely pathogenic variant is described in a similar way. Not everyone with a pathogenic variant gets the disease. A genetic counselor can explain what it means for you and your family.
A pathogenic variant is a gene change linked to a disease or a higher risk of it.
It can be inherited from a parent or happen during a person's lifetime.
Labs report 'pathogenic' and 'likely pathogenic' variants as harmful changes.
Not everyone who has a pathogenic variant will develop the disease.
On this page
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The whole article, with every detail and caution.
The short version
A variant is a change in a gene. The National Cancer Institute (NCI) describes harmful gene changes as pathogenic variants. These changes raise the risk of cancer.
Pathogenic and likely pathogenic
NCI says a positive result means the lab found a harmful change. This kind of change raises cancer risk. NCI calls these pathogenic or likely pathogenic variants.
A higher risk, not a certainty
Not everyone with a pathogenic variant gets the disease. Knowing about it may help prevent, find or treat cancer.
Inherited or not
These changes can be passed down from a parent. They can also happen during a person's life. A test for inherited risk is not the same as a tumor test. Ask which one you had. The meaning for your family is different.
Getting help with the result
A genetic counselor helps people understand their results. They also explain what results mean for relatives. NCI says counseling is generally advised before testing for inherited risk.
What to ask
Ask if the result is from your inherited genes or your tumor. Ask what it means for your care. Ask if your relatives should think about testing. Your team can explain what it means for you.
Sources
Common questions
Does a pathogenic variant mean I will get cancer?
No. NCI notes that not everyone who has a pathogenic variant will develop the disease. It means a higher risk, not a certainty. Your care team or a genetic counselor can explain your own risk.
What is the difference between pathogenic and likely pathogenic?
NCI's genetic testing fact sheet groups them together as harmful changes that raise cancer risk.
Is it inherited?
It can be. NCI says pathogenic variants can be inherited from a parent or occur during a person's lifetime. Testing for inherited risk is different from testing a tumor. Ask which kind of test you had.
Should my family be tested?
Possibly. A result found in inherited genes may matter for your blood relatives. A genetic counselor can help you decide how to share it and who might think about testing.
Questions to ask your doctor
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Your next step
Plain-language definitions for the words on your report.
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Get urgent help
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Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Sources last checked: 2026-10-02 what this meansLast updated: 2026-10-02Next planned review: 2027-09-27
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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, 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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