Glossary of Medical Terms

F-18 FES

A radiolabeled substance being studied as an imaging agent in breast cancer. F-18 FES binds to estrogen receptors and gives off radiation that can be detected by a PET scan. The PET scan forms an image that shows where cancer cells with estrogen receptors can be found in the body. It is a type of radioimaging agent. Also called F-18 16 alpha-fluoroestradiol.

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