RESEARCH TRIANGLE PARK, N.C.--(BUSINESS WIRE)--Quintiles today announced a comprehensive suite of biomarker assays to help biopharmaceutical companies investigate the phosphoinositide 3-kinases (PI3K) cancer survival pathway, the focus of numerous anti-cancer therapies under development. Understanding the PI3K pathway is essential in developing new medicines to inhibit or block this pathway, thereby cutting off a metabolic function needed for certain cancers to survive.