| Health / Medical Topics |
18F-Fluoroazomycin Arabinoside
A radiofluorinated 2-nitroimidazole derivative with positron-emitting radioisotope activity. Upon administration, 18F-fluoroazomycin arabinoside is reduced under hypoxic conditions in the tumor microenvironment to a reactive species that covalently binds to intracellular macromolecules, providing a quantitative measure of viable hypoxic tissue when imaged with positron emission tomography. Compared to 18F-misonidazole, 18F-fluoroazomycin arabinoside has a lower octanol:water partition coefficient; it therefore has less tendency to accumulate in lipophilic tissues and exhibits a faster renal clearance, which may result in improved imaging of hypoxic tissue. (NCI Thesaurus)
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