Expression and significance of vascular endothelial growth factor receptor 2 in bladder cancer

The Journal of Urology
Guangbin XiaParkash S Gill

Abstract

Vascular endothelial growth factor has a critical role in maintaining tumor microvasculature and, as such, is an attractive target for anti-angiogenic therapy. Aberrant expression of VEGF receptors, especially VEGFR2, on epithelial tumor cells allows VEGF to stimulate growth and migration of tumor cells in an autocrine and/or paracrine manner. Therefore, we studied the expression of VEGF and VEGFR2 in bladder cancer, and the relationship to disease characteristics. Expression of VEGF and VEGFR2 was studied in a cohort of 72 patients with transitional cell cancer of the bladder. Tumor tissues from all patients were analyzed by immunohistochemistry and examined by a pathologist blinded to patient outcome. Patient demographics and disease outcome were correlated with expression of these markers. Bladder cancer cell lines that express VEGFR2 were studied in vitro and in vivo to establish the significance of VEGF/VEGFR2 signaling. Expression of VEGF and VEGFR2 was observed in 58% and 50% of urothelial tumor cells, respectively. VEGF expression failed to correlate with clinical variables. However, VEGFR2 expression correlated with disease stage (coefficient 0.23, p = 0.05). In addition, VEGFR2 expression increased with tumor invasion...Continue Reading

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