The National Toxicology Program is accepting comments on a revised process for reviewing substances that may be added to its widely cited "Report on Carcinogens." NTP is accepting comments up to Nov. 30th.

The Report is required by Congress to be published every two years, and is designed to provide information on substances that may pose a hazard to human health by virtue of their carcinogenicity. Substances are listed in the report as either known or reasonably anticipated human carcinogens. The 12th Report was published in June, 2011. But now, the NTP is proposing changes to the review process for listing substances in the 13th Report.