选择性p110αPI3K抑制剂;Selective p110α PI3K inhibitor;PIK-75是一种p110α抑制剂,IC50为5.8 nM (比作用于p110β效果强200倍),亚型特异性的突变体在Ser773,也有效抑制DNA-PK,IC50为2 nM。;PIK-75 is a p110α inhibitor with IC50 of 5.8 nM (200-fold more potently than p110β), isoform-specific mutants at Ser773, and also potently inhibits DNA-PK with IC50 of 2 nM.