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The Insulin-like Growth Factor System As a Potential Therapeutic Target in Gastrointestinal Stromal Tumors

Overview
Journal Cell Cycle
Specialty Cell Biology
Date 2008 Sep 27
PMID 18818517
Citations 20
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Abstract

The majority of gastrointestinal stromal tumors (GISTs) are characterized by oncogenic gain-of-function mutations in the receptor tyrosine kinase (RTK) c-KIT with a minority in PDGFRalpha. Therapy for GISTs has been revolutionized by the use of the selective tyrosine kinase inhibitor imatinib mesylate (IM). For the subset (approximately 10-15%) of GISTs that lack oncogenic mutations in these receptors, the genetic changes driving tumorigenesis are unknown. We recently reported that the gene encoding the insulin-like growth factor 1 receptor (IGF-1R) is amplified in a subset of GISTs, and the IGF-1R protein is overexpressed in wild-type and pediatric GISTs. In this report we present a more complete picture of the involvement of components of the insulin-like growth factor-signaling pathway in the pathogenesis of GISTs. We also discuss how the IGF pathway may provide additional molecular targets for the treatment of GISTs that respond poorly to IM therapy.

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