P13K

Definition of phosphatidylinositol-3 kinase
National Cancer Institute

phosphatidylinositol-3 kinase

(FOS-fuh-TY-duh-lih-NOH-sih-TOL-3 KY-nays)
A type of enzyme that transmits signals in cells and that helps control cell growth. Some tumors have higher-than-normal levels of phosphatidylinositol-3 kinase. Also called PI3 kinase and PI3K.

Source: NCI Dictionary of Cancer Terms