HDAC9 and chronic myelogenous leukemia, BCR-ABL1 positive: Structural and biochemical analyses confirmed the efficient and selective binding of martinostat to HDAC isoenzyme ligand-binding pockets, resulting in histone and tubulin hyperacetylation in both imatinib-sensitive and resistant CML cells, outperforming vorinostat, a clinically used HDAC inhibitor (HDACi).