CCL2 and neoplasm: Monocyte chemoattractant protein-1 (MCP-1), also referred to as C–C motif chemokine ligand 2 (CCL2), is a chemoattractant or chemokine that is expressed in a variety of cells including endothelial cells, smooth muscle cells, fibroblasts, epithelial cells, mesangial cells, astrocytes, myeloid cells, T cells, and tumor cells.