Gallium-67 concentrates in a variety of soft-tissue and
tumor, however the accumulation is not specific for malignant
tumor. The increase the
tumor to non-
tumor ratio is important to improve the quality of the
tumor image. It has been recently found that the clearance of 67Ga from blood and the attainment of high ratios of the
tumor to normal soft-tissue concentrations are accelerated, if the serum
iron concentration is high. The present investigation was, therefore, undertaken in order to study the effect of administered
iron after injection of 67Ga on the accumulation of 67Ga in the
tumor tissue of mice bearing Ehrlich's ascited
tumor. The following results were obtained. The accumulations of 67Ga in the
tumor and soft-tissues were slightly decreased compared with controls after ferric
acid saccharated (Fesin) administration 3, 6 and 24 hours after injection of 67Ga. However, the
tumor to blood ratio (T/B) in each group treated with Fesin was considerably increased because the clearance of 67Ga from the blood is accelerated. The large
tumor to blood ratio (T/B) would be advantageous for
tumor scanning.