Panobinostat, a non-selective HDAC inhibitor, has been examined for its tumor suppressor effect against certain cancers and is currently under investigation in clinical trials for several cancers, such as cutaneous T-cell lymphoma, Hodgkin’s lymphoma, prostate cancer, thyroid cancer, and other solid and hematological malignancies [31,32,33]. The gene discussed is HDAC9; the disease is primary cutaneous T-cell non-Hodgkin lymphoma.