Which statement describes carcinogen assessments across agencies?

Which statement describes carcinogen assessments across agencies?

• A. Not all agencies use the same criteria; classifications vary.
• B. All agencies use identical criteria.
• C. Carcinogen classifications are universally standardized.
• D. Only IARC issues carcinogen classifications.

Answer: (A)

Carcinogen assessments across agencies differ because each organization uses its own framework for evaluating evidence and deciding what counts as a cancer hazard. Some agencies focus on hazard identification—asking whether a substance could cause cancer under certain conditions—while others perform risk assessments that weigh exposure levels and dose to estimate actual risk to people. For example, IARC groups substances based on the strength of human and animal evidence, whereas other agencies like EPA or NTP use different criteria, scales, and thresholds. Because the criteria, required evidence, and timing of updates vary, classifications for the same substance can differ between agencies.

Carcinogen assessments across agencies differ because each organization uses its own framework for evaluating evidence and deciding what counts as a cancer hazard. Some agencies focus on hazard identification—asking whether a substance could cause cancer under certain conditions—while others perform risk assessments that weigh exposure levels and dose to estimate actual risk to people. For example, IARC groups substances based on the strength of human and animal evidence, whereas other agencies like EPA or NTP use different criteria, scales, and thresholds. Because the criteria, required evidence, and timing of updates vary, classifications for the same substance can differ between agencies.