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18F-fluoromisonidazole
Pronunciation
Definition 1
A radioactive substance being studied as an imaging agent in head and neck cancers and other types of cancer. It binds to large molecules in tumor cells that have a low level of oxygen. Radiation given off by 18F-fluoromisonidazole is detected by a PET scan. The amount of 18F-fluoromisonidazole in the tumor may help decide the best treatment and help predict whether the cancer will come back after treatment. 18F-fluoromisonidazole is a type of radioimaging agent. Also called 18F-MISO and FMISO. (NCI Dictionary)
Definition 2
A radiofluorinated 2-nitroimidazole derivate with hypoxia-specific tracer activity. Misonidazole is reduced under hypoxic conditions and in reduced form covalently binds to macromolecules in hypoxic cells. 18F (fluorine-18) radiofluorination of misonidazole to form 18F-fluoromisonidazole allows radioisotopic imaging of reduced misonidazole bound to macromolecules in hypoxic cells. (NCI Thesaurus)
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