PIK3R3 and cancer: In addition, PTK2 protein tyrosine kinase 2 (PTK2), phosphatidylinositol 3-kinase regulatory subunit gamma (PIK3R3), and phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit delta (PIK3CD) are shown to be related to pathways in cancer (KEGG ID: map 05200) [9].