WZ4003 is primarily used as a selective inhibitor of protein kinases, particularly in research settings focused on cellular signaling pathways. It is employed to study the role of specific kinase enzymes in cancer progression, helping scientists understand mechanisms of tumor growth and resistance to therapy. Due to its selectivity, WZ4002 is valuable in developing targeted therapies, especially in models of lung and breast cancer where kinase activity drives disease. It is commonly used in in vitro assays and cell-based experiments to modulate kinase activity and observe downstream effects on cell proliferation, apoptosis, and migration. Its application supports drug discovery efforts aimed at identifying new oncology treatments with improved specificity and reduced side effects.