Abstract: The invention relates generally to phosphoinositide 3-kinases (PI3Ks), and more particularly to methods of inhibiting leukocyte accumulation comprising selectively inhibiting phosphoinositide 3-kinase delta (PI3K?) and phosphoinositide 3-kinase gamma (PI3K?) activities in endothelial cells. The disclosed methods may be used to treat individuals having an inflammatory condition where leukocytes are found to be accumulating at the site of insult or inflamed tissue. The inflammatory condition may be attributed to or associated with an underlying disorder not typically associated with inflammation, e.g. cancer, coronary vascular disease, etc.