HDAC9 and glioblastoma: Intriguingly, accumulating evidence has further indicated that HDAC inhibitors, such as entinostat, SAHA, trichostatin A and KA2507, could suppress the growth of cancer cells and induce apoptotic cell death in a variety of malignancies including metastatic uveal melanoma, lung cancers, glioblastoma, etc. [25–28].