Immunohistochemical examination of the tumor xenografts revealed that the phosphorylation of c-Raf/MEK/ERK was markedly suppressed in PDCD6-KD HCT116 cells xenografts, whereas c-Raf/MEK/ERK phosphorylation was markedly enhanced in the PDCD6-OE compared with the vector control cell xenografts. The gene discussed is PDCD6; the disease is neoplasm.