Abstract
An early image of intra-tumor distribution of14C-labeled fluorodeoxy glucose (14C-FDG) was compared with a late image of18F-labeled FDG (18F-FDG) using mouse fibrosarcoma. Heterogeneous intra-tumor distribution of14C-FDG was observed 1 minute post injection of the tracer, whereas relatively homogeneous distribution of18F-FDG was seen 30 minutes later.14C-FDG was particularly taken up in the peripheral part of the tumor immediately after the tracer injection. A gradual and significant increase in18F-FDG accumulation with time was seen in the central part of tumor, which indicated an enhancement of anaerobic glycolysis. An initial uptake of18F-FDG was also compared with distribution of14C-iodoantipyrine and14C-thymidine uptake. Intratumoral distribution of initial uptake of18F-FDG showed almost the same regional distribution of14C-iodoantipyrine. A similar distribution of14C-thymidine as the initial uptake of18F-FDG was also observed. These results indicated that a high initial FDG uptake area seemed to be highly proliferative. A significant difference in the intratumoral distribution of FDG between early phase and late phase seemed to be related to heterogeneous biological characteristics of tumor cells.
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Inoue, O., Shukuri, M., Hosoi, R. et al. Distinct different intra-tumor distribution of FDG between early phase and late phase in mouse fibrosarcoma. Ann Nucl Med 19, 655–659 (2005). https://doi.org/10.1007/BF02985113
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DOI: https://doi.org/10.1007/BF02985113