NDRG1 and hepatocellular carcinoma: Consistent with results shown in Fig. S5A, the analysis of our proteomic dataset confirmed that NDRG1 was among the proteins up-regulated after PMA treatment (Fig. S5C) Moreover, we observed that treatment of the Huh7 hepatocellular carcinoma cell line, and of the HCT-15 and HCT-116 colon cancer cell lines with PMA led to an increased expression of NDRG1 (Fig. S5D).