To test whether secreted endogenous HGF, TGF-β and bFGF directly contribute to the fibroblast-triggered enhancement of cancer cell migration speed that we have previously described (Angelucci et al, 2012), cell-tracking experiments were performed on tumor cells co-cultured with NFs or CAFs in the presence of antibodies directed against HGF, TGF-β or bFGF. The gene discussed is HGF; the disease is cancer.