In agreement with these findings, the decreased expression of cleaved caspase-3 protein by tectochrysin (Fig. 3b) and DNA binding activity of NF-κB by tectochrysin were also abolished in SW480 and HCT116 colon cancer cells treated with DR3, DR4 and Fas siRNA (Fig. 3c). This evidence concerns the gene FAS and malignant colon neoplasm.