– FD223 is a potent, selective phosphoinositide 3-kinase delta (PI3Kδ) inhibitor with a marked affinity (IC50=1 nM), demonstrating notable selectivity against other isoforms (IC50s: α=51 nM, β=29 nM, γ=37 nM). This compound effectively suppresses the proliferation of acute myeloid leukemia (AML) cell lines by inhibiting p-AKT Ser473, thereby inducing G1 phase cell cycle arrest. FD223 holds promise for leukemia research, particularly in AML[1].