Figure 3. Summary of the different factors secreted by myeloid cells that aid in the different stages of metastasis. TAMs, tumor-associated macrophages; MDSC, myeloid-derived suppressor cells; TEMs, Tie2-expressing macrophages; DCs, dendritic cells; MCP, mast cell protease; IL, interleukin; VEGF, vascular endothelial growth factor; TNF, tumor necrosis factor; PIGF, placental growth factor; TYMP, thymidine phosphorylase; PD-ECGF, Platelet-Derived Endothelial Cell Growth Factor; TGF, transforming growth factor; EGF, epidermal growth factor; HGF, hepatocyte growth factor; bFGF, basic fibroblast growth factor; IGF, insulin-like growth factor; IFN, interferon; ANG, angiopoietin; MSF, migration stimulating factor; mIR, microRNA; MMP, matrix metalloproteinase.