CCL2 and neoplasm: Cytokines, including tumor necrosis factor‐α, interleukin (IL)‐6, IL‐10, IL‐12, IL‐17, transforming growth factor‐β, chemokine (C–C motif) ligand 2 (CCL2; also known as monocyte chemoattractant protein 1), chemokine (C–X–C motif) ligand 1, and macrophage migration inhibitory factor, influence tumor development [3].