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  • Title: Iodinated bleomycin: an unsatisfactory radiopharmaceutical for tumor localization.
    Author: Eckelman WC, Kubota H, Siegel BA, Komai T, Rzeszotarski WJ, Reba RC.
    Journal: J Nucl Med; 1976 May; 17(5):385-8. PubMed ID: 57231.
    Abstract:
    Cobalt-57-bleomycin is a clinically useful tumor-localizing agent, but attempts to label bleomycin (BLEO) with other radionuclides have been made because of the long physical half-life of 57Co. As an alternative labeling approach, we iodinated BLEO both directly on the imidazole ring and indirectly by reaction with N-succinimidyl 3-(4-hydroxy, 3-iodophenyl) propionate. Directly iodinated BLEO retained antibacterial activity, but in tumor-bearing rats it showed a lower tumor-to-blood ratio (2.3) at 2 hr than did 57Co-BLEO (11.8). The antibacterial activity of the indirectly labeled BLEO was markedly reduced and this material showed a tumor-to-blood ratio of 0.55 at 2 hr. The radioiodinated bleomycins are not suitable substitutes for 57Co-BLEO as tumor-imaging radiopharmaceuticals.
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