Answer
A carcinogen is a chemical/physical factor that causes cancer by being carcinogenic. Some cause both initiation and promotion of carcinogenesis. Some viruses common in human habitats are also known to be carcinogenic.
The following are some well-known carcinogens:
a. Organic chemicals:
In tobacco; N-nitrosonornicotine, vinyl chloride and benzo(a)pyrene (suppresses p53 protein).
These may cause cancers of larynx, pancreas, esophagus, urinary bladder, kidneys and cervix
b Asbestos, nickel, cadmium, benzyl chloride, arsenic, uranium, radon
c. Aflatoxin, formaldehyde, aflatoxin, 2-4-d-herbicides, Roundup glyphosate
Common cancers--sarcomas, malignant lymphomas, non-Hodgkin's lymphomas
Metals, dust,, plastics.
b. metals, dust, wood dust, chemical pesticides,
Work Step by Step
The following viruses are also known to be carcinogenic:
Hepatitis B Virus ( B & C ).
Epstein Barr Virus
Human Papilloma Virus (HPV)
These viruses cause cervical cancer and liver cancer
