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NCI Dictionary of Cancer Terms

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phosphatidylinositol-3 kinase  listen  (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.