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

PTEN Genetic Test

The PTEN genetic test identifies mutations in the tumor suppressor gene PTEN, which can help guide cancer treatment or diagnose inherited syndromes.

What is a PTEN genetic test?

A PTEN genetic test analyzes blood or tissue to detect changes (variants or mutations) in the PTEN gene. PTEN 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 damaged cells.

Changes in this gene can be:

  • Acquired: Developed after birth due to DNA errors, aging, carcinogens (like UV radiation), or chronic viral infections. These are common in various cancers.
  • Inherited: Present from birth and passed from parent to child. These are rare but can cause PTEN hamartoma tumor syndrome (PHTS), which includes conditions like Cowden syndrome and Bannayan-Riley-Ruvalcaba syndrome.

Why do I need a PTEN genetic test?

If you have cancer: The test determines if a PTEN gene change is present, which can influence treatment choices and how the disease behaves.

If you have a family history of PHTS: The test helps manage cancer risk. Symptoms of PHTS include:

  • Multiple hamartomas (benign tumors) in the mouth, intestines, breasts, or skin.
  • Macrocephaly (larger than normal head size).
  • Developmental delays, learning disabilities, or autism.
  • Thyroid, kidney, colorectal, uterine, or breast cancer.

What happens during the test?

The sample type depends on the reason for testing:

  • For cancer: Tissue biopsies (fine needle or core needle) or bone marrow tests are used.
  • For inherited changes: A blood test or a buccal (cheek) swab is used.
  • For prenatal testing: Amniocentesis or chorionic villus sampling (CVS) may be performed.

What do the results mean?

If an acquired change is found, your provider will use this to tailor your cancer treatment plan. If an inherited change is found, it confirms PHTS. While this does not mean you have cancer, it indicates a higher risk. Management strategies may include:

  • Frequent cancer screenings and yearly exams.
  • Lifestyle changes (exercise, healthy diet, quitting smoking).
  • Preventative surgery (such as mastectomy or hysterectomy) or medication.

Genetic counseling is recommended to help understand the risks and benefits of testing for you and your family.

Frequently Asked Questions

If a PTEN mutation is found in a tumor, certain targeted therapies—such as PI3K/AKT/mTOR inhibitors—may be more effective. Additionally, knowing the mutation status can guide the use of immunotherapy or influence the choice of chemotherapy agents, as PTEN loss can affect drug sensitivity. Discussing results with a medical oncologist ensures the most appropriate treatment plan.
Inherited mutations are present in every cell from birth and are passed from parent to child; they underlie PTEN hamartoma tumor syndrome. Acquired mutations arise later in life, often in specific tissues, and are associated with sporadic cancers. Inherited mutations usually require lifelong surveillance for multiple organ systems, whereas acquired mutations are typically confined to the affected tumor.
Yes, a prenatal PTEN test can be done via amniocentesis or chorionic villus sampling if there is a known family mutation. Detecting a PTEN mutation in the fetus allows parents to plan for early monitoring and intervention. However, the procedure carries a small miscarriage risk, so it should be discussed thoroughly with a genetic counselor and obstetrician.
PTEN test confirms whether the mutation causing Cowden syndrome is present in you or your relatives. Identifying the mutation allows for personalized cancer surveillance (e.g., earlier colonoscopies, breast MRI screening) and informs family members who may also carry the mutation. Early detection of associated cancers can significantly improve outcomes.
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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