Similar MTT {[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrasodium bromide] tetrazolium salt} assay was used to evaluate the inhibitory effects of G6-5A, G6-5S and G6-5A-5S conjugates on the adhesion of colon cancer cell lines to fibronectin (Fn)-coated artificial substrate membrane. The gene discussed is FN1; the disease is malignant colon neoplasm.