Abstract
1,3-butadiene (BD) is present in synthetic rubber and motor fuels (gasoline). BD is shown to cause lymphocytic lymphomas, heart hemangiosarcomas, lung alveolar bronchiolar cancers, forestomach-squamous cell cancers, harderian gland neoplasms, preputial gland adenoma or carcinoma, liver-hepatocellular cancers, mammary gland acinar cell carcinomas, ovary-glanulosa cell carcinoma, brain cancers, pancreas adenoma and carcinoma, testis-Leydig cell tumors, thyroid follicular adenoma and carcinoma, and zymbal gland carcinoma in rodents and to date no exposure level has been established at which this chemical does not cause cancers.