DOTATATE (Ga-68)
Overview
Gallium-68 DOTATATE is a radiolabeled somatostatin analog consisting of an octapeptide (Tyr3-octreotate) conjugated to the macrocyclic chelator DOTA, which binds the positron-emitting radioisotope gallium-68. It exhibits high affinity for somatostatin receptor subtype 2, which is overexpressed on neuroendocrine tumor cells, enabling PET imaging of these malignancies. The 68-minute half-life of gallium-68 and the rapid pharmacokinetics of the peptide provide excellent tumor-to-background ratios within 1 to 2 hours post-injection.
Key Research Findings
The FDA approved gallium-68 DOTATATE (Netspot) in June 2016 for PET imaging of somatostatin receptor-positive neuroendocrine tumors based on studies demonstrating superior lesion detection compared to conventional imaging modalities including octreotide scintigraphy. A prospective multicenter trial published in the Journal of Nuclear Medicine (2013) showed 95.1% sensitivity for neuroendocrine tumor detection.
Intravenous
FDA Approved
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