BST2 and cancer: As shown in Figure 1A, the expression of four representative anti-viral genes (IFI27, BST2, OAS2, and MX1) is induced greatly after 24 h and sustained at high levels for at least 72 h after a single treatment with IFNβ (3 IU/ml) of two different human non-cancer cell lines, hTERT-HME1 mammary epithelial cells and BJ fibroblasts.