IL6 and neoplasm: VEGF [69], FGF2 [69], PGF [70], IL-6 [71], IL-8 [72], HGF [73], SDF-1 [74], IGF-1 [75], MCP-1 [76], uPA [77], PGE2 [78], TGF-β1 [79] among others have been identified as the tumor-MSC recruiting factors.