National Toxicology Program

The Report on Carcinogens (RoC) is a congressionally mandated, science-based, public health report that identifies agents, substances, mixtures, or exposures (collectively called "substances") in our environment that may potentially put people in the United States at increased risk for cancer.

The National Toxicology Program (NTP) prepares the RoC on behalf of the Secretary, Health and Human Services.

Published biennially, each edition of the report is cumulative and consists of substances newly reviewed in addition to those listed in previous editions. . The 12^th RoC, the latest edition, was published on June 10, 2011. The 13^th RoC is under development.

For each listed substance, the RoC contains a substance profile, which provides information on:

• cancer studies that support the listing—including those in humans, animals and on possible mechanisms of action
• potential sources of exposure to humans
• current Federal regulations to limit exposures

• Candidate Substances
• Process for Preparation of the Report on Carcinogens
• 12^th Report on Carcinogens
• Background documents for some listed substances
• Public comments for some listed substances
• Review process for the 12th RoC
• Expert panel meetings for the 12th RoC
• Documents, Reviews and Responses

• History of the RoC
• Since You Asked — 12^th Report on Carcinogens (Questions and Answers)
• For contact information, visit the Office of the RoC.