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Octreotide is used for the treatment of growth hormone producing tumors (acromegaly and gigantism), when surgery is contraindicated, pituitary tumors that secrete thyroid-stimulating hormone (thyrotropinoma), [citation needed] diarrhea and flushing episodes associated with carcinoid syndrome, and diarrhea in people with vasoactive intestinal peptide-secreting tumors ().
An octreotide scan is a type of SPECT scintigraphy used to find carcinoid, pancreatic neuroendocrine tumors, and to localize sarcoidosis. It is also called somatostatin receptor scintigraphy (SRS). Octreotide , a drug similar to somatostatin , is radiolabeled with indium-111 , [ 1 ] and is injected into a vein and travels through the bloodstream.
Octreotate or octreotide acid is a somatostatin analogue that is closely related to octreotide. Its amino acid sequence is H-D-Phe-Cys-Phe-D-Trp-Lys-Thr-Cys-Thr-OH
The natural somatostatin receptor ligand, the 14 amino acid peptide somatostatin (A), was abridged to the biologically more stable 8 amino acid peptide Octreotide (OC, B). Introduction of a tyrosine into the 3rd position of the Octreotide sequence resulted in Tyr3-Octreotide (TOC, C), which allows for iodination of the tyrosine residue with the ...
Some agonists were already approved by the FDA for clinical use, such as In-DTPA-octreotide and Ga-DOTATATE. [4] Development started after the discovery of modifications that can be done to the octreotide group, a ssrt selective subtype agonist, to cause its agonistic effects to be lost and gain antagonistic effects. [ 8 ]
68 Ga DOTA-TATE (gallium-68 dotatate, GaTate) is used to measure tumor SSR density and whole-body bio-distribution via PET imaging. [11] [12] 68 Ga DOTA-TATE imagery has a much higher sensitivity and resolution compared to 111 In octreotide gamma camera or SPECT scans, due to intrinsic modality differences. [11]
Participants were randomly assigned to receive either 177 Lu dotatate with long-acting octreotide or long-acting octreotide, at a higher dose, alone. [15] 177 Lu dotatate was injected through the vein and long-acting octreotide was injected in the muscle. [15] Both, participants and health care providers knew which treatment was given. [15]
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