SIGNALING PATHWAYS IN TUMOR VASCULOGENIC MIMICRY
Solid tumor growth is dependent on the development of an adequate blood supply. For years, sprouting angiogenesis has been considered as exclusive mechanism of tumor vascularization. However, in recent years another mechanism of tumor vascularization has been identified that does not involve endothelial cells, a process called vasculogenic mimicry (VM). VM describes the unique ability of highly aggressive tumor cells to form vessel-like networks by virtue of their high plasticity. VM has been observed in several tumor types, and its occurrence is strongly associated with poor prognosis. This review will focus on signaling molecules and cascades involved in VM. In addition, we will describe the clinical significance of VM regardless of anti-angiogenesis treatment modalities.