CAY10703 is primarily utilized in research settings as a potent and selective inhibitor of protein kinase D (PKD). It is widely used in biochemical and cellular studies to investigate the role of PKD in various signaling pathways. Researchers employ CAY10703 to explore its effects on processes such as cell proliferation, migration, and secretion, particularly in cancer biology. By inhibiting PKD activity, it helps elucidate the kinase's involvement in disease mechanisms, offering insights into potential therapeutic targets. Additionally, CAY10703 is used in pharmacological studies to assess its efficacy and specificity in modulating PKD-related functions, contributing to the development of novel treatments for conditions like inflammation and cancer.