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Molecular Pathways |
Authors' Affiliations: 1 Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical College, Asahikawa, Hokkaido, Japan and 2 Gastrointestinal Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts
Requests for reprints: Yusuke Mizukami, Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical College, 2-1 Midorigaoka-Higashi, Asahikawa, Hokkaido 078-8510, Japan. Phone: 81-166-68-2462; Fax: 81-166-68-2469; E-mail: mizu{at}asahikawa-med.ac.jp.
Abstract
Among the factors that can stimulate angiogenesis, vascular endothelial growth factor has emerged as one of the most important, and inhibition of vascular endothelial growth factor has recently shown efficacy in the treatment of advanced colorectal cancer. Hypoxia develops within solid tumors and is one of the most potent stimuli of vascular endothelial growth factor expression. This effect is mediated primarily by hypoxia inducible factor-1 (HIF-1), often considered a master regulator of angiogenesis in hypoxia. Consequently, inhibition of HIF-1 has been proposed as a strategy to block tumor angiogenesis therapeutically. However, accumulating evidence indicates that HIF-independent pathways can also control angiogenesis. This review highlights some of the key signaling pathways independent of HIF-1 that can stimulate angiogenesis in hypoxia. Understanding the full spectrum of molecular pathways that control tumor angiogenesis is critical for the optimal design of targeted therapies.
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