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lüll The epidemiology of cancer in animals Dorn CRCalif Med 1967[Dec]; 107 (6): 481-9The principles of epidemiology are applicable to the study of the distribution and determinants of cancer in both human and animal populations. There are many examples of epidemiologic factors (host, environment, agent and time) related to cancer in animals. Certain host characteristics such as age, sex and breed are related to risk of developing cancer. Some environmental influences are illustrated by differences in the geographical distribution of certain types of animal cancer. Aggregations of cancer cases have been reported in herds, families and households. However, the usual distribution of cases in a population does not resemble epidemics typical of infectious diseases. Several factors (radiological, chemical, dietary, parasitic, mechanical, genetic and viral) have been identified as influences that affect the development of animal tumors. Animal species that have been domesticated live longer and consequently malignant disease develops in more of them. Cancer incidence rates now available from data compiled by an animal neoplasm registry in Alameda and Contra Costa counties, California, indicate that some of the frequent sites of cancer in man (skin, breast and the hemic and lymphatic systems) are among the most frequent sites in dogs and cats, man's closest animal associates.|Animal Feed[MESH]|Animals[MESH]|Breeding[MESH]|Carcinogens[MESH]|Cats[MESH]|Dogs[MESH]|Genetics, Population[MESH]|Horns/injuries[MESH]|Humans[MESH]|Neoplasms, Radiation-Induced/veterinary[MESH]|Neoplasms/epidemiology/genetics/*veterinary[MESH]|Oncogenic Viruses[MESH]|Parasitic Diseases, Animal[MESH]|United States[MESH] |