PD 198306 is primarily utilized in biochemical research to study cellular signaling pathways, particularly those involving protein kinases. It serves as a valuable tool for investigating the mechanisms of kinase inhibition and its effects on cell proliferation and differentiation. Researchers also employ it to explore potential therapeutic targets in diseases where kinase activity is dysregulated, such as cancer and inflammatory disorders. Its application extends to screening assays to identify and validate novel kinase inhibitors, contributing to drug discovery efforts.