HDAC9 and primary cutaneous T-cell non-Hodgkin lymphoma: Vorinostat (suberoylanilide hydroxamic acid), is an oral pan HDAC inhibitor (inhibits class I, II and IV of HDACs) that was approved by the U.S. FDA for the treatment of patients with relapsed or refractory CTCL in October 2006 based on response rates [29].