HDAC9 and cancer: Furthermore, prior studies have demonstrated that HDAC inhibitors such as SAHA, SelSA, SB, benzoic acid and cinnamic acid derivatives induce cancer cells death by increasing the levels of ROS (Ruefli et al., 2001; Sanmartín et al., 2012; Anantharaju et al., 2017a; Salimi et al., 2017).