HDAC9 and neoplasm: Another synthetic HDAC inhibitor, MS-275,potently inhibits histone deacetylases in several human tumor cells,which supports our findings that show reduced cell proliferation inTFK-1 and EGI-1 cells treated with MS-275 alone and in combinations.33 In TFK-1 and EGI-1 cells, the selective HDAC8inhibitor, PCI-3405134 showed a significantreduction at 10 μM in both cell lines.