Somatostatin-14 (somatostatin) and its clinically available analogues octreotide, lanreotide, and vapreotide are potent inhibitors of growth hormone, insulin, and glucagon release. Recently, a novel backbone cyclic somatostatin analogue c (GABA-Phe-Trp-(D) Trp-Lys-Thr- Phe-GlyC3-NH2)(analogue 1, PTR 3173) that possesses in vivo endocrine selectivity was described. This long-acting octapeptide exhibits high affinity to human recombinant ...