HDAC9 and cancer: As ROS accumulation is implicated in HDAC inhibitor‐induced apoptosis in cancer cells (Rosato et al., 2003; Ungerstedt et al., 2005), we sorted redox‐related genes by GO annotations from the total 829 differentially expressed genes and found the marked expression changes in several redox‐responsive genes (Fig. 2A and Table S2).