A, a schematic network indicates targets for in vitro validation. B, buparlisib in combination with the MEK inhibitor trametinib shows synergistic decrease of cell viability of the WHIM12 cell line. C and D, cells were treated with buparlisib alone or in combination with a PI3K or mTOR inhibitor, respectively, showing synergistic effects on the WHIM12-derived cell line. E, a combination of PI3K and/or mTOR inhibition leads to synergistic decrease of cell viability. F, the dual PI3K and mTOR inhibitor omipalisib shows a marked decrease in cell viability on its own. B-F, mean and error bars (standard deviations) of cell viability treated with indicated drug(s) relative to control from three independent experiments are shown; * ≤ 0.05 and ** ≤ 0.01 as significance.