Aq4{5-Nitro-2-furyl)-2-thiazolyl]acetamide (NFTA), fed to female Swiss mice at doses of 0.05 and 0.1% of the diet, induced a high incidence of lymphocytic leukemia and a low incidence of forestomach tumors. Several other chemicals structurally related to NFTA were also fed to female Swiss mice to determine structure-activity relationships with respect to organ specificity. 7V-[4-(5-Nitro-2-fury...