Azurin was shown to enter preferentially to cancer cells (Yamada et al. 2005) (Taylor et al. 2009) and stabilize tumor suppressor p53, increasing the expression of pro-apoptotic Bax and Bax-dependent apoptosis in cancer cells (Punj et al. 2004) (Yamada et al. 2002a, b). This evidence concerns the gene BAX and cancer.