Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Riedl, CC; Brader, P; Zanzonico, P; Reid, V; Woo, Y; Wen, B; Ling, CC; Hricak, H; Fong, Y; Humm, JL.
Tumor hypoxia imaging in orthotopic liver tumors and peritoneal metastasis: a comparative study featuring dynamic 18F-MISO and 124I-IAZG PET in the same study cohort.
Eur J Nucl Med Mol Imaging. 2008; 35(1):39-46
Doi: 10.1007/s00259-007-0522-2
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- Co-Autor*innen der Med Uni Graz
- Brader Peter
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- Abstract:
- PURPOSE: The purpose of this paper is to compare the uptake of two clinically promising positron emission tomography (PET) hypoxia targeting agents, (124)I-iodoazomycin galactopyranoside ((124)I-IAZG) and (18)F-fluoromisonidazole ((18)F-FMISO), by dynamic microPET imaging, in the same rats bearing liver tumors and peritoneal metastasis. METHODS: Morris hepatoma (RH7777) fragments were surgically implanted into the livers of four nude rats. Tumors formed in the liver and disseminated into the peritoneal cavity. Each rat had a total of two to three liver tumors and peritoneal metastasis measuring 10-15 mm in size. Animals were injected with (18)F-FMISO, followed on the next day (upon complete (18)F decay) by (124)I-IAZG. The animals were imaged in list mode on the microPET system from the time of injection of each tracer for 3 h and then again at 6 h and 24 h for the long-lived (124)I-IAZG tracer (4.2-day half-life). Micro computed tomography (CT) scans of each rat were performed for co-registration with the microPET scans acquired with a liver contrast agent, allowing tumor identification. Regions of interest (ROIs) were drawn over the heart, liver, muscle, and the hottest areas of the tumors. Time-activity curves (TACs) were drawn for each tissue ROI. RESULTS: The (18)F-FMISO signal increased in tumors over the 3-h time course of observation. In contrast, after the initial injection, the (124)I-IAZG signal slowly and continuously declined in the tumors. Nevertheless, the tumor-to-normal-tissue ratios of (124)I-IAZG increased, but more slowly than those of (18)F-FMISO and as a result of the differentially faster clearance from the surrounding normal tissues. These pharmacokinetic patterns were seen in all 11 tumors of the four animals. CONCLUSIONS: (18)F-FMISO localizes in the same intra-tumor regions as (124)I-IAZG. The contrast ratios (tumor/background) reach similar values for the two hypoxia tracers, but at later times for (124)I-IAZG than for (18)F-FMISO and, therefore, with poorer count statistics. As a consequence, the (18)F-FMISO images are of superior diagnostic image quality to the (124)I-IAZG images in the Morris hepatoma McA-R-7777 tumor model.
- Find related publications in this database (using NLM MeSH Indexing)
- Animals -
- Anoxia - metabolism
- Disease Models, Animal -
- Half-Life -
- Liver Neoplasms, Experimental - pathology
- Misonidazole - administration and dosage
- Monosaccharides - administration and dosage
- Nitroimidazoles - administration and dosage
- Peritoneal Neoplasms - radionuclide imaging
- Positron-Emission Tomography -
- Rats -
- Tissue Distribution -
- Find related publications in this database (Keywords)
- hypoxia
- fluoromisonidazole
- iodoazomycin galactopyranoside
- microPET
- dynamic PET