While research has shown that the fluid mechanics of the tumor vasculature reduce transport and uptake of therapeutics, the underlying role of these stresses in regulating tumor-endothelial cell signaling and neovascularization are not well understood. Understanding the reciprocal interaction between endothelial and tumor cells to mediate angiogenesis, and the effect of fluid shear on this process, may offer insight into the development of improved treatment modalities to control highly vascularized tumors. We have previously shown that breast cancer cells cultured under 2D, static conditions with endothelial cells significantly increase expression of pro-angiogenic factors vascular endothelial growth factor (VEGF) and angiopoietin 2 (ANG2) [1]. These preliminary results motivated the investigation of tumor-endothelial cross-talk under 3D, dynamic co-culture conditions.

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