Etiology of Cancer Extrinsic factors Intrinsic facors Chemical carcinogens Hereditary factors . Chemotherapeutic Agents .Radiation Metal fibers and dust . Dietary .virusEtiology of Cancer Extrinsic factors •Chemical carcinogens •Chemotherapeutic Agents •Radiation •Metal •Fibers and Dust •Dietary •Virus Intrinsic facors •Hereditary factors