Which statement about gene probes is most directly useful in counseling someone with a family history of cancer?

• A. Identify carrier of a cancer gene
• B. Identify which cancer gene present
• C. Identify the most effective treatment
• D. Identify dietary changes

Answer: (B)

In hereditary cancer counseling, knowing the exact cancer gene that is mutated provides the most actionable information. Different genes carry different cancer risks and have distinct surveillance recommendations, so identifying which gene is involved allows you to tailor risk estimates and screening plans for the patient and to offer targeted cascade testing to relatives for that specific mutation. This specificity is why it’s more useful than simply labeling someone a carrier, since many hereditary cancer syndromes are inherited in an autosomal dominant pattern and the precise gene determines which cancers to monitor and at what ages. By contrast, a gene test result doesn’t by itself dictate the most effective treatment or dictate dietary changes; treatment depends on cancer type and stage, and diet is not driven by a single gene mutation.