NCIt definition : The mesylate salt of puquitinib, an orally available selective inhibitor of the delta
form of phosphatidylinositol 3-kinase (PI3-kinase subunit delta; PI3K-delta; PI3Kdelta),
with potential antineoplastic activity. Upon oral administration, puquitinib selectively
binds to the ATP-binding pocket of PI3K-delta and prevents the activation of the PI3K/AKT
signaling pathway. This decreases proliferation of and induces cell death in PI3K-delta
over-expressing tumor cells. PI3K-delta also plays a key role in the B-cell receptor
(BCR) signaling pathway and the proliferation of certain hematologic cancer cells.
The targeted inhibition of PI3K-delta is designed to preserve PI3K signaling in normal,
non-neoplastic cells, thereby minimizing serious side effects.;