Catalytic activity:ATP + 1-phosphatidyl-1D-myo-inositol 4 ,5-bisphosphate = ADP + 1-phosphatidyl-1D-myo-inositol 3 ,4 ,5-trisphosphate. ,Disease:Defects in PIK3CA are associated with breast cancer [MIM:114480]. ,Disease:Defects in PIK3CA are associated with colorectal cancer (CRC) [MIM:114500]. ,Disease:Defects in PIK3CA are associated with ovarian cancer [MIM:167000]. Ovarian cancer is the leading cause of death from gynecologic malignancy. It is characterized by advanced presentation with loco-regional dissemination in the peritoneal cavity and the rare incidence of visceral metastases. These typical features relate to the biology of the disease , which is a principal determinant of outcome. ,Disease:Defects in PIK3CA may underlie hepatocellular carcinoma (HCC) [MIM:114550]. ,Disease:PI3KCA mutations affecting exons 9 and 20 display gender-and tissue-specific patterns , thus suggesting that the different amino acid changes could exert distinct functional effects on the oncogenic properties of this enzyme. Furthermore , sexual dimorphisms and tissue specific factors might directly or indirectly influence the occurrence of PI3KCA cancer alleles. ,Function:Phosphorylates PtdIns , PtdIns4P and PtdIns (4 ,5) P2 with a preference for PtdIns (4 ,5) P2. ,similarity:Belongs to the PI3/PI4-kinase family. ,similarity:Contains 1 C2 domain. ,similarity:Contains 1 PI3K/PI4K domain. ,subunit:Heterodimer of a p110 (catalytic) and a p85 (regulatory) subunit. Binds to IRS1 in nuclear extracts. Interacts with RUFY3. ,
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