This fact sheet describes the scientific evidence on whether the insecticide dibromochloropropane (DBCP) affects the risk of breast cancer and other cancers. This includes a summary of the studies that have evaluated its cancer risk, information on DBCPs past use in agriculture, in nurseries and in turf and lawn care, levels in water supplies in areas of past use, regulation by federal agencies, who may be exposed to DBCP, trade names and synonyms for DBCP, where more research is needed.