title: Somatostatin-receptor imaging in the localization of endocrine tumors.
abstract: METHODS
  A number of different tumors have receptors for somatostatin. We evaluated the efficacy of scanning with 123I-labeled Tyr3-octreotide, a somatostatin analogue, for tumor localization in 42 patients with carcinoid tumors, pancreatic endocrine tumors, or paragangliomas. We then evaluated the response to octreotide therapy in some of these patients.
  
  
  RESULTS
  Primary tumors or metastases, often previously unrecognized, were visualized in 12 of 13 patients with carcinoid tumors and in 7 of 9 patients with pancreatic endocrine tumors. The endocrine symptoms of these patients responded well to therapy with octreotide. Among 20 patients with paragangliomas, 8 of whom had more than one tumor, 10 temporal (tympanic or jugular), 9 carotid, and 10 vagal tumors could be visualized. One small tympanic tumor and one small carotid tumor were not seen on the scan.
  
  
  CONCLUSIONS
  The 123I-labeled Tyr3-octreotide scanning technique is a rapid and safe procedure for the visualization of some tumors with somatostatin receptors. A positive scan may predict the ability of octreotide therapy to control symptoms of hormonal hypersecretion.
authors.affiliation: Department of Medicine, Erasmus University, Rotterdam, The Netherlands.
authors.forename: S W
authors.initials: SW
authors.lastname: Lamberts
authors.forename: W H
authors.initials: WH
authors.lastname: Bakker
authors.forename: J C
authors.initials: JC
authors.lastname: Reubi
authors.forename: E P
authors.initials: EP
authors.lastname: Krenning
mesh_terms: D007516:Adenoma, Islet Cell / Q000000981:diagnostic imaging*; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002276:Carcinoid Tumor / Q000000981:diagnostic imaging* / Q000556:secondary; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D008297:Male; D008875:Middle Aged; D015282:Octreotide / Q000031:analogs & derivatives* / Q000378:metabolism / Q000627:therapeutic use; D010190:Pancreatic Neoplasms / Q000000981:diagnostic imaging*; D010235:Paraganglioma / Q000000981:diagnostic imaging; D017981:Receptors, Neurotransmitter / Q000378:metabolism; D017481:Receptors, Somatostatin; D014055:Tomography, Emission-Computed
chemical_list: D007457:Iodine Radioisotopes; D017981:Receptors, Neurotransmitter; D017481:Receptors, Somatostatin; C045210:3-Tyr-octreotide; D015282:Octreotide