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NCI Dictionary of Cancer Terms

N-butyl-N-(4-hydroxybutyl) nitrosamine  listen  (... BYOO-tul ... (4-hy-DROK-see-BYOO-tul) ny-TROH-suh-meen)

  A substance that is used in cancer research to cause bladder tumors in laboratory animals. This is done to test new diets, drugs, and procedures for use in cancer prevention and treatment.