What is the CTCAE and what is it used for?

• A. Common Terminology Criteria for Adverse Events; used to grade severity of treatment-related toxicities.
• B. Tumor Response Criteria; used to measure shrinkage.
• C. Glasgow Coma Scale; used to assess consciousness.
• D. Performance Status Scale; used to evaluate activity.

Answer: (A)

CTCAE stands for Common Terminology Criteria for Adverse Events. It is a standardized framework used to grade the severity of treatment-related toxicities in oncology. The system provides a common vocabulary and a graded scale (from mild to severe) for adverse events, which allows consistent reporting across trials and clinical care and helps guide management decisions. This consistency is essential for regulatory reporting, comparing safety profiles of therapies, and tracking patient safety over time. For context, other scales measure different things: tumor response criteria assess changes in tumor size to gauge shrinkage; the Glasgow Coma Scale evaluates consciousness; and performance status scales assess a patient’s ability to carry out daily activities. CTCAE specifically targets adverse events from treatment, not tumor response or functional status.