An<unk>  process is any tumor-forming process. Oncovirinae, retroviruses which contain an onc gene, are categorized as such because they trigger the growth of tumorous tissues in the host. Oncogenesis is the process of malignant tumor growth.
carcinogen a substance, radionuclide or radiation directly involved in the promotion of cancer.
mutagen a physical or chemical agent that changes the genetic information of an organism.
teratogen
oncogene a modified gene believed to cause cancer.
Oncogenic
Malignant
Occult
Antineoplastic
Chronic 
Virus cancer link
Acute 
Gram-positive