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• W1986723218 abstract "The aim of this study was to evaluate the diagnostic value of a new somatostatin analog, ⁶⁸Ga-labeled 1,4,7,10-tetraazacyclododecane-<i>N,N′,N″,N″′-</i>tetraacetic acid-d-Phe¹-Tyr³-octreotide (⁶⁸Ga-DOTA-TOC), for PET in patients with known or suspected neuroendocrine tumors. PET was compared with conventional scintigraphy and dedicated CT. <b>Methods:</b> Eighty-four patients (48 men, 36 women; age range, 28–79 y; mean age ± SD, 58.2 ± 12.2 y) were prospectively studied. For analysis, patients were divided into 3 groups: detection of unknown primary tumor in the presence of clinical or biochemical suspicion of neuroendocrine malignancy (<i>n</i> = 13 patients), initial tumor staging (<i>n</i> = 36 patients), and follow-up after therapy (<i>n</i> = 35 patients). Each patient received 100–150 MBq ⁶⁸Ga-DOTA-TOC. Imaging results of PET were compared with ^99mTc-labeled hydrazinonicotinyl-Tyr³-octreotide (^99mTc-HYNIC-TOC) and ¹¹¹In-DOTA-TOC. CT was also performed on every patient using a multidetector scanner. Each imaging modality was interpreted separately by observers who were unaware of imaging findings before comparison with PET. The gold standard for defining true-positive (TP), true-negative (TN), false-positive (FP), and false-negative (FN) results was based on all available histologic, imaging, and follow-up findings. <b>Results:</b> PET was TP in 69 patients, TN in 12 patients, FP in 1 patient, and FN in 2 patients, indicating a sensitivity of 97%, a specificity of 92%, and an accuracy of 96%. The FP finding was caused by enhanced tracer accumulation in the pancreatic head, and the FN results were obtained in patients with a tumor of the gastrointestinal tract displaying liver metastases. ⁶⁸Ga-DOTA-TOC showed higher diagnostic efficacy compared with SPECT (TP in 37 patients, TN in 12 patients, FP in 1 patient, and FN in 34 patients) and diagnostic CT (TP in 41 patients, TN in 12 patients, FP in 5 patients, and FN in 26 patients). This difference was of statistical significance (<i>P</i> < 0.001). However, the combined use of PET and CT showed the highest overall accuracy. <b>Conclusion:</b>⁶⁸Ga-DOTA-TOC PET shows a significantly higher detection rate compared with conventional somatostatin receptor scintigraphy and diagnostic CT with clinical impact in a considerable number of patients." @default.
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• W1986723218 date "2007-04-01" @default.
• W1986723218 modified "2023-10-18" @default.
• W1986723218 title "68Ga-DOTA-Tyr3-Octreotide PET in Neuroendocrine Tumors: Comparison with Somatostatin Receptor Scintigraphy and CT" @default.
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• W1986723218 doi "https://doi.org/10.2967/jnumed.106.035667" @default.
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