“…Fibrin(ogen) potentiates FGF-2-but not VEGF-induced proliferation of endothelial cells, angiogenesis and cancer cell growth (Rybarczyk & Simpson-Haidaris, 2000;Sahni & Francis, 2000;Sahni et al, 2006;Sahni et al, 2008;Sahni et al, 1999;Simpson-Haidaris, 1997;Simpson-Haidaris & Rybarczyk, 2001). Furthermore, fibrin(ogen) enhances cell migration and cancer invasion through tumor stroma, and TEM, i.e., intravasation of breast cancer cells into the blood stream (Step 3) (Roche et al, 2003;Rybarczyk et al, 2003;Sahni et al, 2009). Fg and fibrin can bridge between cells of the same or different kinds (Kloczewiak et al, 1983;Languino et al, 1995;Languino et al, 1993;Saito et al, 2002;Sriramarao et al, 1996) and form aggregates or tumor emboli coated with fibrin(ogen) (Step 4).…”