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Radiolabeled Amino Acids: Basic Aspects and Clinical Applications in Oncology*

Department of Nuclear Medicine, PET Center, and Department of Medical Oncology, University Hospital Groningen, Groningen, The Netherlands; and Institute of Medicine, Research Center Jülich, Jülich, Germany

As the applications of metabolic imaging are expanding, radiolabeled amino acids may gain increased clinical interest. This review first describes the basic aspects of amino acid metabolism, then continues with basic aspects of radiolabeled amino acids, and finally describes clinical applications, with an emphasis on diagnostic value. A special focus is on ¹¹C-methionine, ¹¹C-tyrosine, and ¹²³I-iodomethyltyrosine, because these have been most used clinically, although their common affinity for the L-transport systems may limit generalization to other classes of amino acids. The theoretic and preclinical background of amino acid imaging is sound and supports clinical applications. The fact that amino acid imaging is less influenced by inflammation may be advantageous in comparison with ¹⁸F-FDG PET imaging, although tumor specificity is not absolute. In brain tumor imaging, the use of radiolabeled amino acids is established, the diagnostic accuracy of amino acid imaging seems adequate, and the diagnostic value seems advantageous. The general feasibility of amino acid imaging in other tumor types has sufficiently been shown, but more research is required in larger patient series and in well-defined clinical settings.

Key Words: radiolabeled amino acids • ¹¹C-methionine • ¹¹C-tyrosine • ¹²³I-iodo--methyltyrosine • tumor imaging

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