塞拉贝西布产品是Serabelisib is a potent inhibitor of phosphoinositide 3-kinase α (PI3Kα) that is selective for p110α in vitro (IC₅₀ = 15 nM for PI3Kα vs. >1 µM for other isoforms, as well as for mTOR). MLN1117 inhibits AKT phosphorylation and growth in PIK3CA mutant breast cancer cells with IC₅₀ values around 2 μM, yet has no effect on cells lacking PTEN.