has_participant has participant has participant positively regulates positively regulates phosphatidylinositol 3-kinase activity regulation of phosphatidylinositol 3-kinase activity positive regulation of phosphatidylinositol 3-kinase activity Any process that activates or increases the frequency, rate or extent of phosphatidylinositol 3-kinase activity. GO:0043552 activation of phosphatidylinositol 3-kinase activity biological_process positive regulation of phosphoinositide 3-kinase activity stimulation of phosphatidylinositol 3-kinase activity up regulation of phosphatidylinositol 3-kinase activity up-regulation of phosphatidylinositol 3-kinase activity upregulation of phosphatidylinositol 3-kinase activity biological regulation positive regulation of lipid kinase activity FLT1 FLT3 KIT PDGFRB CCL19 CCL21