...we tested whether primary human AML cells with N-terminal C/EBPα mutations would be sensitive to WDR5 antagonism. At 5 μM, OICR-9429 caused a significant decrease in viability in the majority of patient cells with mutations in the N-terminal part of the CEBPA gene (mean viability; 53%, n=8, Fig. 6e). Strikingly, the same concentration of OICR-9429 had little effect on viability in AML patient cells with other mutations (mean viability: 86%, n=5).