Generally, the activation of resident fibroblasts, induced by the cross-talk with tumor cells, may be sustained by growth factors released from tumor cells, the most important being the TGF-β, even if many other molecules seem to be involved in the CAFs activation, such as HGF, PDGFs, FGFs, EGFs, and interleukin-1β (18, 30, 37, 38). Here, HGF is linked to neoplasm.