Genetic Testing Fact Sheet - National Cancer Institute
Genetic Testing for Hereditary Cancer Syndromes
Key Points
- Genetic mutations play a role in the development of all cancers. Most of these mutations occur during a person’s lifetime, but some mutations, including those that are associated with hereditary cancer syndromes, can be inherited from a person’s parents.
- Inherited mutations play a major role in the development of about 5 to 10 percent of all cancers.
- The genetic mutations associated with more than 50 hereditary cancer syndromes have been identified, and genetic tests can help tell whether a person from a family with such a syndrome has one of these mutations.
- A genetic counselor, doctor, or other health care professional trained in genetics can help an individual or family understand genetic test results.
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