MAP20071018119 Job-related cancer Sumario: This draft summary of a joint report from the National Cancer Institute and the National Institute of Environmental Health Sciences proposes that most cancers have multiple causes, and that it is an error to assign an exclusive, single cause to each cancer En: National safety news. - Chicago. - Vol. 118, nº 6, December 1978 ; p. 55-56 1. National Cancer Institute . 2. National Institute of Environmental Health Sciences . 3. Medicina laboral . 4. Cáncer . 5. Enfermedades profesionales . 6. Epidemiología . 7. Investigación . 8. Estadísticas . 9. Estados Unidos . I. Title. II. Título: National safety news.