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  • An orally bioavailable selective inhibitor of the delta isoform of phosphatidylinositide 3-kinase (phosphoinositide 3\'-kinase delta; PI3Kd; PI3K-d), with potential antineoplastic activity. Upon oral administration, PI3K-delta inhibitor HMPL 689 selectively binds to and inhibits PI3Kd, and prevents the activation of the PI3Kd/AKT signaling pathway, and B-cell activation. This both decreases proliferation and induces cell death in PI3Kd-overexpressing tumor cells. PI3Kd plays a key role in the B-cell receptor (BCR) signaling pathway and the proliferation of hematologic cancer cells. The targeted inhibition of PI3Kd is designed to preserve PI3K signaling in normal, non-neoplastic cells and thereby to minimize serious side effects. PI3Kd, an enzyme often overexpressed in cancer cells, plays a crucial role in tumor cell regulation and survival. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C148532\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C148532\' NCI Thesaurus)
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