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Radioactive metal complexes of ethylenediamine-N,N-diacetic acid. Biodistribution of radioactivity in mice bearing tumors.

Complexes of ethylenediamine-N, N-diacetic acid (EDDA) with radioactive metal ions and 3H-labeled EDDA were prepared and the biodistribution of the radioactivity in mice bearing Ehrlich tumor was studied. Radioactive complexes studied were those of 51Cr, 57Co, 59Fe, 64Cu, and 67Ga. μ-Oxo 57Co EDDA was prepared by treatment of 57Co EDDA with hydrogen peroxide. The tumor/blood ratios of radioactivity indicated that 57Co EDDA and μ-oxo 57Co EDDA were concentrated in the tumor tissues, whereas other complexes and 3H-EDDA were not. The tumor tissues were clearly visualized in scintigrams after the administration of the 57Co complexes to mice.