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Department of Biological Regulation, Weizmann Institute of Science, Rehovot 76100 Israel
Vascular endothelial growth factor (VEGF) mRNA and protein levels were higher in MCF7 breast cancer cells and orthotopic tumors after treatment with tamoxifen, as compared with treatment with estrogen. Accordingly, tumor vascular permeability, evaluated in vivo from contrast-enhanced magnetic resonance imaging, was elevated during treatment with tamoxifen. The results indicate that estrogen regulates angiogenesis in MCF7 tumors by maintaining VEGF at levels sufficient for the generation of functional microcapillaries and consequently facilitates tumor growth. During tamoxifen treatment, estrogen regulation is removed, and VEGF increases to levels that enhance markedly vascular permeability and reduce their perfusion function, leading to inhibition of tumor progression.
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