The two "hit" and multiple "hit" theories of carcinogenesis.
D000293:Adolescent; D000328:Adult; D000368:Aged; D004739:England; D005260:Female; D005838:Genotype; D006801:Humans; D008433:Mathematics; D008875:Middle Aged; D008962:Models, Theoretical; D009369:Neoplasms / Q000209:etiology*; D010641:Phenotype; D013270:Stomach / Q000473:pathology; D013274:Stomach Neoplasms / Q000401:mortality / Q000473:pathology / Q000503:physiopathology; D014852:Wales