Tumor angiogenesis: the pivotal role of vascular endothelial growth factor

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Abstract
There is considerable evidence that vascular endothelial growth factor is involved in the vascularization and growth of primary tumors and in the formation of metastases. The expression of vascular endothelial growth factor depends on activated oncogenes and inactivated tumor-suppressor genes as well as several other factors, e.g., growth factors, hypoxia, and tumor promoters. Substantial expression of vascular endothelial growth factor receptors is mainly restricted to tumor vessels. The causal involvement of this angiogenic factor in the progression of the disease has been successfully evaluated using monoclonal antibodies against vascular endothelial growth factor, dominant negative receptor mutants, and antisense oligonucleotides against the messenger RNA of vascular endothelial growth factor. Thus, the vascular endothelial growth factor-signaling system seems to be an appropriate target for inhibition of tumor angiogenesis and metastasis formation.

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