ETP-46321 是一種有效的 PI3Kα 和 PI3Kδ 抑制劑，K_iapp 分別為 2.3 和 14.2 nM。ETP-46321 is selected to be screened against other PI3K isoforms. ETP-46321 is more potent against isoform α (K_iapp=2.3 nM). ETP-4632, has been profiled and shown to be a potent PI3K α and δ inhibitor, highly selective versus mTOR and 288 representative kinases. ETP-46321 is also tested against three of the p110α mutant enzymes detected in human cancers (E542K, E545K and H1047R), being equipotent against these mutants when compared to the wild type protein (K_iapp=2.33, 1.77 and 1.89 nM for PI3Kα-H1047R, PI3Kα-E545K and PI3Kα-E542K, respectively). ETP-46321 inhibits the phosphorilation of AKT in U2OS cell line with an IC₅₀ of 8.3 nM