substances that bring about a malignant change in body cells
Substances that increase the risk of neoplasms in humans or animals. Both genotoxic chemicals, which affect DNA directly, and nongenotoxic chemicals, which induce neoplasms by other mechanism, are included. ... (12 Dec 1998) ... 
(Learning Modules / Biology / DNA / Glossary) Cancer-promoting chemicals.
are agents, usually chemical, that promote cancer
Substances known to cause cancer.