HDAC9 and leukemia: Similarly, a significantly increased level of apoptotic cells was observed when infant KMT2A-r leukemia cells were treated with CBL0137 in combination with another HDAC inhibitor, entinostat (Supplementary Figure 8), confirming that the enhanced anti-leukemic effect provided above by panobinostat in combination treatment involves its inhibitory action on deacetylation.