How can genetic testing help people from families with early-onset colorectal cancer?

For individuals from families with a history of early-onset colorectal cancer, genetic testing serves as a vital tool for presymptomatic diagnosis. Even if a person appears healthy, they may carry inherited mutations—such as those linked to familial adenomatous polyposis—that significantly increase their risk of developing the disease.123

By identifying these genetic predispositions, testing enables:

• Heightened Surveillance: Clinicians can implement proactive monitoring, such as more frequent colonoscopies, which can detect tumors early and potentially save lives.3
• Informed Decision-Making: Genetic counseling is essential to help individuals understand their risk, interpret test results, and navigate the emotional and practical implications of their status.43
• Early Intervention: Detecting a defect before tumor formation begins allows for medical management that may prevent the clinical onset of symptoms or irreversible damage.13

It is important to note that testing results are not always certain; a positive result indicates an increased risk rather than a guaranteed outcome, while a negative result does not rule out all potential inherited mutations.1