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Insulin-Like Growth Factor-I and Breast Cancer Therapy

University of Minnesota Cancer Center, Minneapolis, Minnesota

Requests for reprints: Douglas Yee, University of Minnesota Cancer Center, MMC 806, 420 Delaware Street Southeast, Minneapolis, MN 55455. Phone: 612-626-8487; Fax: 612-626-4842; E-mail:yeexx006{at}umn.edu.

Targeting hormonal and growth factor signaling pathways has proven to be useful in the treatment of breast cancer. In vitro, animal, and epidemiologic evidence provide a rationale for the relevance of the insulin-like growth factor (IGF) system to breast cancer biology. The IGF system has been implicated in promoting mitogenic, metastatic, and antiapoptotic phenotypes in breast cancer. As a consequence of the ability of IGF to promote tumorigenesis, pharmacologic interventions targeting the IGF system are being devised. Such strategies include decreasing ligand production, ligand binding, or receptor activation. In this article, directed anti-IGF strategies and the possible clinical impact of using such therapies for treating breast cancer are discussed.

Key Words: monoclonal antibody • tyrosine kinase inhibitors • proliferation • apoptosis • survival

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