Functional Activity of the Multiligand Analog SOM230 at Human Recombinant Somatostatin Receptor Subtypes Supports Its Usefulness in Neuroendocrine TumorsSchmid H.A. · Schoeffter P.
Novartis Institutes for Biomedical Research, Novartis Pharma AG, Oncology and Neuroscience Research, WSJ.386.425, Basel, Switzerland
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Functional gastroenteropancreatic tumors express all 5 somatostatin receptor subtypes (sst) in different quantities. Octreotide and lanreotide treat patients with these tumors by binding preferentially to sst2 and, to a lesser extent, to sst3 and sst5 receptors, thereby controlling prominent symptoms caused by hormone hypersecretion (diarrhea and flushing). Although symptoms initially improve in most patients, a loss of response occurs in about 50% during continuous treatment. The functional activity at sst receptors of SOM230, a new multiligand somatostatin analog, has been described and compared with that of somatostatin (SRIF-14) and octreotide. These data show that SOM230 is a full agonist with nanomolar potency at sst1,2,3 and sst5 receptors. The multiligand activity profile of SOM230, together with its nondesensitizing inhibitory effect on growth hormone and insulin-like growth factor-I secretion in rats, may underlie its successful use in clinical trials and its potential for use in refractory patients with carcinoid tumors.
© 2004 S. Karger AG, Basel
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