Western blot was done as previously described[20 (link)]. Antibodies specific for the following targets were from Santa Cruz (Heidelberg, Germany): BAX, histone deacetylase 2 (HDAC2), HDAC1, and p53. Anti-survivin was obtained from Novus Biologicals (Cambridge, United Kingdom). HSP90 antibody was provided by Enzo Life Sciences (Lörrach, Germany).