Li-Fraumeni Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Li-Fraumeni Syndrome?
A medical geneticist (a doctor who treats inherited conditions) and an oncologist (a cancer doctor) usually guide care, with help from a genetic counselor (an expert who explains genetic risks). A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is Li-Fraumeni syndrome?
Li-Fraumeni syndrome (LFS) is a rare inherited condition. It greatly raises the risk of several types of cancer, particularly in children and young adults. It is thought to occur in 1 in 5,000 to 1 in 20,000 people worldwide.
Not everyone with a TP53 gene change will develop cancer. But lifetime cancer risks are much higher than in the general population. Many people with LFS develop two or more cancers over their lifetimes.
Symptoms
Doctors suspect LFS when a person or family has a history of cancer, especially many cancers or cancers at a young age.
The cancers most closely linked to LFS include:
- Soft tissue sarcoma, a cancer of soft tissue such as muscle.
- Osteosarcoma, a type of bone cancer.
- Breast cancer, especially when it starts early in life.
- Brain tumors.
- Adrenocortical carcinoma, a cancer of the outer layer of the adrenal glands. These are small glands on top of each kidney that make hormones.
- Leukemia, a cancer of the blood-forming tissues.
Other cancers can also appear, but the risks are lower. People with LFS have about a 50% chance of developing cancer by age 40 and up to a 90% chance by age 60.
Causes and who gets it
LFS is caused by an inherited change in the TP53 gene. This gene normally helps control the growth and division of cells. A change in the gene can let cells divide in an uncontrolled way and form tumors.
LFS is passed down in an autosomal dominant pattern. This means one changed copy of the gene is enough to raise the cancer risk. Most people with LFS inherit the changed gene from a parent. In 7 to 20 percent of cases, the change is new and was not inherited. A parent with the change has a 50% chance of passing it on with each pregnancy.
Smoking tobacco and radiation exposure may add to the cancer risk.
How doctors diagnose it
LFS is diagnosed when a genetic test finds a harmful change in the TP53 gene. The test can use a blood or saliva sample. Doctors consider testing when a person's cancer history and family cancer history fit certain rules.
Talks about testing should include a genetic counselor, medical providers and family.
Treatment
Right now, there is no standard treatment or cure for LFS. With some exceptions, cancers in people with LFS are treated the same way as cancers in other people.
Screening is a big part of care. It means regular checks to find cancer early. Experts widely accept that finding cancer early can greatly improve survival. Screening should start as soon as LFS is diagnosed. An expert panel recommends whole body MRI screening. This is a scan of the whole body.
People with LFS appear to be at higher risk of cancers caused by radiation. CT scans and other tests that use radiation should be limited whenever possible. Radiation therapy for cancer should not be avoided if its benefits outweigh the risks.
When to see a doctor
Talk with a doctor about genetic counseling if you or your family have many cancers or cancers that start young. If you have LFS, get prompt care from your primary care doctor for any health concern. The risk of cancer begins in early childhood and continues for life, so children need this care too.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Either type of doctor can help arrange genetic counseling and keep track of your screening visits. They can also help coordinate your genetics and cancer specialists.
Common questions
Is Li-Fraumeni syndrome the same as cancer?
No, Li-Fraumeni syndrome is an inherited condition that raises the risk of cancer. Not everyone with a TP53 gene change will develop cancer.
Can Li-Fraumeni syndrome be cured?
No, there is currently no standard treatment or cure for LFS. Cancers that appear are mostly treated like cancers in other people, and screening can help find them early.
Can I pass Li-Fraumeni syndrome to my children?
Yes, a parent with the TP53 gene change has a 50% chance of passing it on with each pregnancy. The risk is the same for males and females.
Do people with Li-Fraumeni syndrome need to avoid X-rays and CT scans?
They should limit them when possible, because people with LFS appear to be at higher risk of cancers caused by radiation. Radiation therapy for cancer should not be avoided if its benefits outweigh the risks.
Does everyone in a family with Li-Fraumeni syndrome get cancer?
No, not everyone with a TP53 gene change will develop cancer. The effect of a gene change can differ from person to person, even within one family.
Sources
- MedlinePlus Genetics - Li-Fraumeni syndrome
- National Organization for Rare Disorders - Li-Fraumeni Syndrome
- National Cancer Institute - Cancer Screening Protocol for Patients with Li-Fraumeni Syndrome
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
