On the origin of the cancer cells.
D000663:Amphibians; D000818:Animals; D046508:Culture Techniques; D006801:Humans; D006824:Hybridization, Genetic; D008322:Mammals; D008967:Molecular Biology; D009154:Mutation; D009368:Neoplasm Transplantation; D009369:Neoplasms / Q000209:etiology* / Q000235:genetics / Q000473:pathology; D009858:Oncogenic Viruses