Short answers, pulled from the story.
A carcinogen is any agent that promotes the development of cancer, typically by creating mutations in DNA that disrupt a cell's normal growth regulation. Most carcinogens work by damaging DNA in ways the cell's repair processes fail to correct, allowing defects to accumulate across multiple cell generations until uncontrolled proliferation begins.
The latency period is the time between exposure to a carcinogen and the development of cancer. For most solid tumors in humans, this period ranges from 10 to 40 years depending on the cancer type. For blood cancers, the latency period may be as short as two years.
Common carcinogens include ultraviolet radiation from the sun, radon gas in residential basements, cigarette smoke, alcohol, and processed meats. Tobacco smoke alone contains at least 70 known carcinogens and is responsible for an estimated 90% of lung cancers in the United States.
IARC, the International Agency for Research on Cancer, classifies substances into four groups. Group 1 agents are carcinogenic to humans; Group 2A agents are probably carcinogenic; Group 2B agents are possibly carcinogenic; and Group 3 agents are not classifiable due to insufficient evidence. IARC has published its Monographs series since 1971 from its base in Lyon, France.
Tobacco smoke is the dominant factor, responsible for about 90% of lung cancers in the United States. The most important tumorigenic compounds in tobacco smoke, ranked by a Margin of Exposure approach, are acrolein, formaldehyde, acrylonitrile, 1,3-butadiene, cadmium, acetaldehyde, ethylene oxide, and isoprene. Other contributing factors include occupational carcinogen exposure, radon, and outdoor air pollution.
Yes. Helicobacter pylori is a known cause of stomach cancer and MALT lymphoma. HPV is the primary cause of cervical cancer. Hepatitis B and C are associated with hepatocellular cancer. Aflatoxin B1, produced by the fungus Aspergillus flavus, is a known cause of hepatocellular cancer and commonly contaminates stored grains and nuts.