125I-tyr-3-octreotide

**125I-tyr-3-octreotide** is a *radioiodinated analogue of the somatostatin receptor ligand octreotide*, specifically labeled with radioactive iodine-125 at the tyrosine-3 position. It is used primarily as a radiopharmaceutical tool for imaging and research purposes to detect and study somatostatin receptor-positive tumors, typically neuroendocrine tumors. Its mechanism of action is based on binding with high affinity to somatostatin receptors, particularly subtypes 2 and 5, allowing for the localization and characterization of tumors by imaging techniques. It is not used therapeutically for disease modification or symptom control but for diagnostic, localization, or research applications.

Other names

125I-octreotideradioiodinated octreotide[125I-Tyr3]-octreotide