TP53 mutation carriers surveillance strategy aims to minimize radiation exposure by relying on which approach?

• A. CT-based whole-body imaging annually
• B. MRI and ultrasound with limited CT when necessary
• C. No imaging surveillance
• D. Pet-CT every 6 months

Answer: (D)

In TP53 mutation carriers, the surveillance plan aims to detect cancers early while minimizing exposure to ionizing radiation, because these individuals are more susceptible to radiation-induced cancers. Imaging modalities that do not use ionizing radiation are preferred. MRI uses magnetic fields and does not involve radiation, and ultrasound uses sound waves and also avoids radiation. In contrast, CT scans and PET-CT expose patients to ionizing radiation, sometimes repeatedly, which increases cumulative radiation dose. Therefore, a surveillance approach that relies on MRI and ultrasound with CT used only sparingly when absolutely needed best minimizes radiation exposure. The option describing frequent PET-CT would substantially increase radiation dose, making it less appropriate for this goal.