The short answer
This guide helps readers understand inherited TP53-related cancer risk, specialist surveillance, family testing, and emotional burden. It supports—but does not replace—individual medical, legal, or coverage advice.
The goal is to understand inherited TP53-related cancer risk, specialist surveillance, family testing, and emotional burden.
Confirm that a genetics professional interpreted the TP53 finding in context.
Ask for a written surveillance plan from a team familiar with Li-Fraumeni syndrome.
Tell every care team that you have LFS, so scans using radiation are not ordered casually.
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Li-Fraumeni syndrome (LFS) is an inherited condition that greatly raises the risk of several cancers. It is rare: it is thought to occur in 1 in 5,000 to 1 in 20,000 people worldwide. These figures come from MedlinePlus Genetics.
This page covers the gene, the cancers, testing, and the MRI screening that NCI has studied.
The gene: TP53
TP53 is a tumor suppressor gene. Its job is to help control the growth and division of cells. When one copy is faulty from birth, that brake is weakened in every cell of the body.
Nearly three-quarters of families with Li-Fraumeni syndrome carry a germline change in TP53. "Germline" means the change is in every cell, and can be passed to children.
LFS is inherited in an autosomal dominant pattern. This means one altered copy in each cell is enough to raise cancer risk.
Not everyone inherits it from a parent. In 7% to 20% of cases the change is new in that person, so there is no family history at all.
The cancers linked to LFS
MedlinePlus Genetics lists these cancers as part of LFS:
- Breast cancer.
- Osteosarcoma, a bone cancer.
- Soft tissue sarcomas, cancers of muscle, fat, or connective tissue.
- Brain tumors.
- Leukemias.
- Adrenocortical carcinoma, a cancer of the outer layer of the adrenal gland.
NCI lists LFS as a risk factor for osteosarcoma and for adrenocortical carcinoma in children.
What the risk is
NCI describes people with LFS as facing up to a 90% chance of developing cancer by age 60. The risk is high, and it helps to know that. Your genetics team can explain what it means for your own TP53 change.
Testing and genetic counseling
Who should be tested depends on personal and family cancer history. Ask your doctor for a referral to a genetics professional. They can explain the criteria used, and what a result means for you and your relatives. Testing is best done with genetic counseling, because a result also affects family members.
Screening with MRI
NCI ran a screening study in people with LFS and a germline TP53 change. It used whole-body, brain, and breast MRI, as well as mammography, colonoscopy, bloodwork, and abdominal ultrasound. Ask your center which tests it uses, how often, and who is responsible for booking each one. Screening falls apart when no single person owns the calendar.
Why MRI, and why radiation is avoided
MRI uses magnetic fields, not ionizing radiation. CT scans and x-rays do use ionizing radiation. People with LFS appear to be sensitive to radiation. So NCI's screening protocol avoided imaging with ionizing radiation, apart from mammography.
Say clearly at every appointment, including dental and emergency visits, that you have Li-Fraumeni syndrome. Then your team can weigh any scan that uses radiation. Never skip care that your doctor says you need. Talk with your team about the best choice.
Does screening work?
The National Cancer Institute studied 116 people with LFS and a germline TP53 change.
At the first round of screening, 40 people (34%) had an abnormality found. Eight of them (7%) were diagnosed with a new primary cancer. All but one of those cancers were removed with surgery.
An international analysis of 578 participants across 13 groups found the same 7% cancer detection rate.
Symptoms that need attention between scans
Surveillance runs on a calendar. Cancer does not. Contact the team promptly, without waiting for the next scan, for:
- Swelling over a bone or a bony part of the body.
- Pain in a bone or joint, pain in the arm when lifting, stiffness in a joint, a limp or trouble walking, or a bone that breaks for no known reason. These are the listed signs of osteosarcoma.
- In a child: pain in the abdomen or back, a lump in the abdomen, a feeling of fullness, high blood pressure, acne, growing body hair, deepening of the voice, or growing faster than normal. These are listed signs of childhood adrenocortical carcinoma.
- A new lump anywhere that persists or grows.
Call 911 for a first seizure, sudden weakness or numbness on one side, a sudden severe or unfamiliar headache, repeated vomiting with headache, or new confusion. These need an ambulance rather than a drive to the hospital.
What to ask your team
- Which specific TP53 variant do I have, and what does it mean?
- Who coordinates my surveillance schedule, and how are results tracked over time?
- Which of my relatives should be offered testing, and at what age?
- If I need treatment, how will radiation exposure be weighed?
- Is there an LFS study or registry I can join?
Sources
- Li-Fraumeni Syndrome — MedlinePlus Genetics, National Library of Medicine
- Cancer Screening Protocol for Patients with Li-Fraumeni Syndrome — National Cancer Institute
- Osteosarcoma and Undifferentiated Pleomorphic Sarcoma of Bone Treatment (PDQ) — National Cancer Institute
- Childhood Adrenocortical Carcinoma — National Cancer Institute
Common questions
What causes Li-Fraumeni syndrome?
Nearly three-quarters of families with LFS carry a germline change in TP53, a tumor suppressor gene that helps control cell growth and division. When one copy is faulty from birth, that brake is weakened in every cell. It is inherited in an autosomal dominant pattern, so one altered copy in each cell is enough to raise cancer risk.
Can you have LFS with no family history?
Yes. In 7% to 20% of cases the change is new in that person, so there is no family history at all. A genetics professional can tell you whether testing makes sense.
Which cancers go with LFS?
MedlinePlus lists breast cancer, osteosarcoma, soft tissue sarcomas, brain tumors, leukemias and adrenocortical carcinoma. NCI says people with LFS have a very high chance of cancer over a lifetime.
Why is whole-body MRI used instead of CT?
MRI uses magnetic fields, while CT scans and x-rays use ionizing radiation. People with LFS appear to be sensitive to radiation. In NCI's screening study the protocol avoided imaging with ionizing radiation, apart from mammography.
Does the surveillance schedule actually find cancers?
NCI studied 116 people with LFS and a germline TP53 change. At the first round of screening, 40 people (34%) had an abnormality found, and 8 of them (7%) were diagnosed with a new primary cancer. All but one of those cancers were removed with surgery. An international analysis of 578 participants across 13 groups found the same 7% detection rate.
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Sources last checked: 2026-07-22 what this meansLast updated: 2026-10-02Next planned review: 2027-07-22
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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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