In vivo measurement of tumor estradiol and Vascular Endothelial Growth Factor in breast cancer patients

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Abstract
Angiogenesis, crucial for tumor progression, is a process regulated in the tissue micro-environment. Vascular endothelial growth factor (VEGF) is a potent stimulatory factor of angiogenesis and a negative prognostic indicator of breast cancer. VEGF is biologically active in the extracellular space and hitherto, there has been a lack of techniques enabling sampling of angiogenic molecules such as VEGF in situ. The majority of breast cancers are estrogen-dependent, and estrogen has been shown to regulate VEGF in normal breast tissue and experimental breast cancer. We investigated if microdialysis may be applicable in human breast cancer for sampling of extracellular VEGF in situ and to explore if there is an association with local estradiol and VEGF levels in normal and cancerous breast tissue.

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