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In three patients with carcinoid liver and/or lymph node metastases, we studied the process of tumor tracer uptake and decarboxylation by means of positron emission tomography (PET) using 5-hydroxy-L-tryptophan (5-HTP) 11 C-labeled in the β-position (HTP) and later the same day with 5-HTP 11 C-labeled in the carboxyl group (HTC). With HTP, in which the 11 C-label follows the...
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