IC87114 is a specific inhibitor of PI 3-kinase δ (IC50 = 0.5 μM) with >60-fold selectivity over other isoforms (IC50: α = >100 μM, β = 75 μM, γ = 29 μM). It does not inhibit other protein kinases (p38MAPK, CHK1, cSrc, PKBα, CK1, PKCα, PKCβII) at 10 uM. PI 3-K &delta has an important role in inflammation and inhibition has been shown to impair neutrophil migration. Administration of IC87114 in a mouse asthma model decreased allergic airway inflammation.