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Angiogenesis Assays

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Angiogenesis—the formation of a vascular network—is essential for the support of a developing tumor when simple diffusion of nutrients is impossible. The ability of a solid tumor to achieve metabolic needs beyond simple diffusion is dependent on the development of this neovascular network. The process of angiogenesis lets the tumor become self-sufficient to grow, and also gives it the ability to metastasize. Growth factors added to human-vein endothelial cells in culture may demonstrate tubularization of cells, but this does not necessarily imply angiogenesis. True in vivo angiogenesis means not only the mobilization of endothelial cells, but the degradation of the matrix and the formation of vessel sprouts in a network that can transport red blood cells (RBCs).
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