Chemical carcinogens.
D002273:Carcinogens; D002471:Cell Transformation, Neoplastic / Q000187:drug effects; D004785:Environmental Pollutants; D009369:Neoplasms / Q000139:chemically induced; D009602:Nitrosamines; D009784:Occupational Diseases / Q000139:chemically induced
D002273:Carcinogens; D004785:Environmental Pollutants; D009602:Nitrosamines