The mammary neoplasics are the most common tumors in women being the main cause of death due to late diagnosis, reflected in tumor growth and metastasis development. The tumor growth requires the formation of new blood vessels, is stimulated by vascular endothelial growth factor (VEGF) expressed under the control of the transcription factor hypoxia-inducible (HIF-1±). VEGF, its receptors and molecules involved in angiogenesis are a major target for new therapeutic agents. Some studies have shown that genistein, belonging to the family of isoflavones (polyphenols) has oncostáticos effects. For its properties anti-angiogenic, acting in the regulation of expression of pro-angiogenic factors by inhibiting the activity of protein tyrosine kinase. The objective of this study is to verify the expression HIF-1± and VEGF by imunocythochemistry cell lines of breast cancer in response to induction of hypoxia and treatment with genistein. The results obtained in this study may provide potential benefits of the use of genistein as a therapeutic agent in the treatment of breast cancer, contributing to the growth control and tumor invasion.
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