nitrosodimethylurea and nitroso-1-methyl-3-ethylurea gave rise primarily to tumors of the nervous system , whereas nitrosodiethylurea and nitroso-1-ethyl-3-methylurea gave rise to tumors of the mammary gland , lung , intestinal tract , nervous system , and testicular mesotheliomas .
C0027766
tumors of the nervous system
C0027763
nervous system