VCAM1 and neoplasm: Tumour vasculature endothelial targets such as vascular endothelial growth-factor receptors (VEGFRs), αvβ3 integrins, matrix metalloproteinase receptors (MMPs), collagen and vascular cell-adhesion molecule-1 (VCAM-1), have been exploited to achieve tumour-selective accumulation of PS nano-drug carriers in a tumour’s microvascular blood vessels [4,15].