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TP53 Genetic Test
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

TP53 Genetic Test

The TP53 genetic test identifies mutations in the tumor suppressor gene TP53, which can help guide cancer treatment or identify hereditary cancer risks.

What is a TP53 genetic test?

This test analyzes blood, bone marrow, or tumor tissue to detect changes (mutations) in the TP53 gene. TP53 is a "tumor suppressor" gene that provides instructions for proteins that prevent cells from dividing too quickly, repair damaged DNA, and initiate cell death in irreparable cells. When this gene is mutated, cells may grow uncontrollably, leading to cancer.

Changes in TP53 can be:

  • Acquired: Developing after birth due to aging, exposure to carcinogens (like cigarette smoke or UV radiation), or chronic viral infections. These are common in many adult cancers.
  • Inherited: Present from birth in all cells. Inherited mutations cause Li-Fraumeni syndrome (LFS), a rare condition that increases the risk of various cancers.

What is it used for?

The test is not routine and is primarily used to:

  • Help select appropriate cancer treatments.
  • Check for inherited TP53 mutations in individuals with a family history of LFS-linked cancers.

Why do I need a TP53 genetic test?

You may need this test if you have been diagnosed with cancer or have a personal/family history suggesting Li-Fraumeni syndrome. Cancers closely linked to LFS include osteosarcoma, soft tissue sarcoma, breast cancer, brain tumors, acute leukemia, and adrenal cortical carcinoma.

What happens during a TP53 genetic test?

The test is performed on a blood sample, bone marrow, or tumor tissue obtained via biopsy. Biopsy methods include needle aspiration, surgical removal, or endoscopy. Bone marrow testing involves a specialized procedure to extract fluid and tissue from the hip bone.

Will I need to do anything to prepare for the test?

Blood tests require no preparation. For biopsies or bone marrow tests, consult your provider regarding preparation, especially if sedation is involved, as you may need someone to drive you home.

Are there any risks to the test?

Blood tests carry minimal risk. Biopsies and bone marrow tests may cause temporary soreness at the site, which typically resolves in a few days.

What do the results mean?

An acquired change helps your provider tailor your cancer treatment. An inherited change confirms Li-Fraumeni syndrome. While this does not mean you have cancer, it indicates a higher risk. Management strategies may include frequent cancer screenings, lifestyle changes, chemoprevention, or surgical options like mastectomy.

Frequently Asked Questions

TP53 test can be performed on a peripheral blood draw, a bone marrow aspirate, or a tumor tissue sample obtained by biopsy. For blood, a standard venipuncture is used. Bone marrow requires a local anesthetic and a needle inserted into the posterior iliac crest to aspirate marrow fluid and core tissue. Tumor tissue is usually collected during a diagnostic or therapeutic procedure such as a core needle biopsy, excisional surgery, or endoscopic sampling, depending on the cancer site. The sample is then sent to a molecular pathology lab for DNA extraction and sequencing.
When a TP53 mutation is identified in a tumor, oncologists may consider more aggressive or alternative therapies because TP53‑deficient cancers can be resistant to standard chemotherapy or radiation. For example, some trials use PARP inhibitors, immunotherapy, or dose‑intensified regimens in TP53‑mutated tumors. In germline cases, treatment may also be adjusted to reduce exposure to therapies that increase secondary cancer risk, and patients may be enrolled in clinical trials targeting TP53 pathways.
Yes. A germline TP53 test can confirm or rule out a hereditary mutation before any cancer develops. Early identification allows for personalized surveillance (e.g., annual whole‑body MRI, breast MRI, and regular dermatologic exams) and lifestyle modifications that may reduce risk. Genetic counseling is recommended to discuss testing, implications, and family planning.===
somatic mutation is present only in the cancer cells and indicates that the mutation arose during the development of that tumor. It can inform targeted therapy choices but does not imply inherited cancer risk. A germline mutation is present in every cell of the body, including blood cells, and signifies a hereditary condition such as Li‑Fraumeni syndrome. Germline findings warrant genetic counseling, cascade testing of relatives, and a tailored cancer surveillance plan.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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