Seventeen sup (99m) Tc-labeled ligands were evaluated as tumor scanning agents by preparing sequential scintigrams of mice bearing intramuscularly transplanted Ehrlich tumor. The ligands were labeled by the SnCl 2 method and were administered intravenously to the mice. The ligands studied were ethylenediamine-N, N-diacetic acid (u-EDDA) and structurally related compounds. sup (99m) Tc complexes of u-EDDA, ethylenediamine-N, ...