Skip to main content

HHS Updates Carcinogens List

Four chemicals are added to the official US catalog of potential cancer-causing substances.

Written byMolly Sharlach
| 2 min read

Register for free to listen to this article
Listen with Speechify
0:00
2:00

FLICKR, CGP GREY

The National Toxicology Program of the US Department of Health and Human Services (HHS) released its 13th Report on Carcinogens (RoC) yesterday (October 2). Three new listings and a reclassified one bring the total number of known or anticipated carcinogens to 243. The report, produced by congressional mandate since 1980, is meant to inform the public and provide a framework for agencies that regulate chemical exposure.

Based on evidence that they cause tumors in rodents, the program classified 1-bromopropane, cumene, and pentachlorophenol as “reasonably anticipated” to be human carcinogens, while ortho-toluidine was reclassified as a known carcinogen.

Found in cleaning solutions and spray adhesives, 1-bromopropane is a colorless or pale yellow liquid. Studies have shown that inhalation of 1-bromopropane causes tumors in the skin, lungs, ...

Interested in reading more?

Become a Member of

The Scientist Logo
Receive full access to more than 35 years of archives, as well as TS Digest, digital editions of The Scientist, feature stories, and much more!
Already a member?
Add The Scientist as a preferred source on Google

Add The Scientist as a preferred Google source to see more of our trusted coverage.

Meet the Author

Related Topics

Related articles background image
The Scientist October Digest cover
October 2026

Antarctica’s Blood Falls Teems With Mysterious Microbial Life

Miles away from the closest ocean, marine microbes thrive in the red ice and mud around Blood Falls, offering clues to microbial adaptation and past climate events.

View this Issue
Evaluating Blood Biomarkers for Alzheimer’s Disease Staging

Evaluating Blood Biomarkers for Alzheimer’s Disease Staging

​Beckman Coulter
Find better biologics faster with Stunner and the AI Developability Workcell

Find better biologics faster with Stunner and the AI Developability Workcell

Unchained Labs
An image of microcentrifuge tubes arranged within colorful laboratory racks.

Choose clarity. Choose speed. Choose MyMass™

Refeyn
Characterizing LNP Heterogeneity With Super-Resolution Imaging

Characterizing LNP Heterogeneity With Super-Resolution Imaging

Oni

Products

Stellaromics Logo

Stellaromics Expands Pyxa Adoption as Instruments are Installed at Leading Research Institutions Across the U.S. and EuropeStellaromics, Inc., the leader in 3D

A monoclonal antibody surrounded by immune cells and red blood cells

CellRaft AIR: Find the Right Antibody-Producing Cells Faster

Cell Microsystems
Maxwell® Rapid ccfDNA Kit

Maxwell® Rapid ccfDNA Kit: Automated Purification of ccfDNA in Under 30 Minutes

Promega
Leica Biosystems, Tempus, and Paige logos side by side, marking the addition of Paige digital pathology AI tools to the Aperio AI Store.

Oncology Researchers Gain AI Cancer Tools in One Platform