CCL2 and neoplasm: Many studies have shed light on the complex signaling network that drives myeloid cells toward M2-like TAMs, which involves various cytokines, chemokines, and signals within the tumor microenvironment [71], including prostaglandin E2 (PGE2) [72], chemokine (C–C motif) ligand (CCL)2 [73], colony stimulating factor (CSF)-1 [74], C–X–C motif chemokine (CXCL)12, and IL-6 [75,76].