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How can genetic testing help a person with a family history of early-onset colorectal cancer?
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human genetic disease
Photomicrograph of the BRCA2 tumor suppressor gene on chromosome 13 of the human genome. Inactivation of this growth-regulating gene is associated with a higher risk of developing breast cancer.
For individuals with a family history of early-onset colorectal cancer, genetic testing serves as a vital tool for predictive health management. Because certain forms of colorectal cancer, such as hereditary nonpolyposis colorectal cancer (HNPCC) and familial adenomatous polyposis (FAP), are linked to inherited mutations, testing can identify if an asymptomatic person carries these specific genetic defects.123
The primary benefits of this testing include:
- Heightened Surveillance: Identifying a mutation allows for proactive medical interventions, such as frequent colonoscopies, which can detect tumors at an early, treatable stage and potentially save a patient's life.1
- Informed Decision-Making: Genetic counseling is essential before and after testing to help individuals understand the implications of their results, as test outcomes may indicate a significantly increased risk rather than a certainty of developing cancer.214
- Early Intervention: Accurate predictive information enables clinicians to move beyond reactive care, potentially preventing the clinical onset of symptoms or irreversible damage.1
It is important to note that testing can be complex, as some inherited mutations remain unknown, and results may raise concerns regarding privacy or insurance access. Therefore, consulting with a professional is crucial for navigating these medical and ethical considerations.214