Consequences of angiogenesis for tumor progression, metastasis and cancer therapy

Anti-cancer Drugs
J W RakR S Kerbel

Abstract

The growth of solid tumors to a clinically relevant size is dependent upon an adequate blood supply. This is achieved by the process of tumor stroma generation where the formation of new capillaries is a central event. Progressive recruitment of blood vessels to the tumor site and reciprocal support of tumor expansion by the resulting neovasculature are thought to result in a self-perpetuating loop helping to drive the growth of solid tumors. The development of new vasculature also allows an 'evacuation route' for metastatically-competent tumor cells, enabling them to depart from the primary site and colonize initially unaffected organs. Several molecular and cellular mechanisms have been identified by which tumor parenchyma may exert its angiogenic effect on host endothelial cells. As a result of this paracrine influence, tumor-associated endothelial cells acquire an 'immature' phenotype manifested by rapid proliferation, migration, release of proteases and expression of cytokines, endothelial-specific tyrosine kinases (e.g. flk-1, tek and others) as well as numerous other molecular alterations. Consequently a network of structurally and functionally aberrant blood vessels is formed within the tumor mass. There is also evidenc...Continue Reading

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