STAB1 and cancer: CLEVER-1, also called stabilin-1 or FEEL-1 is a multifunctional transmembrane protein expressed on the surface of a subset of immunosuppressive M2 macrophages and monocytes, afferent and efferent lymphatic endothelium, sinusoidal endothelial cells in the liver and spleen, high endothelial venules (HEVs) and HEV-like vessels during inflammation and cancer [20,21,22].