FL impairs the cytotoxic effects of FLT3 inhibitors. Molm14 cells were incubated in cell culture medium (RPMI with 10% fetal bovine serum) with increasing concentrations of the indicated drugs for 48 hours in the presence of 0, 1, 3, and 10 ng/mL of FL. Cell viability was then determined using the MTT assay. Results are plotted as percentage DMSO control.