The fibronectin connecting segment 1 (CS-1) peptide corresponds to the cell attachment domain in the type-III homology connecting strand (IIICS) of fibronectin (aa 2009-2016 in human fibronectin). Fibronectin CS-1 peptide inhibits tumor metastasis in spontaneous and experimental models.H-Glu-Ile-Leu-Asp-Val-Pro-Ser-Thr-OH or H-EILDVPST-OH