CP-724714 is a selective inhibitor of the HER2 (ErbB2) tyrosine kinase receptor, making it a valuable tool in cancer research, particularly in studies involving breast and other HER2-overexpressing cancers. It is used to investigate signaling pathways driven by HER2, helping to understand tumor growth, proliferation, and survival mechanisms. Due to its specificity, CP-724714 is employed in preclinical studies to evaluate the effects of HER2 inhibition on cancer cell lines and xenograft models. It supports the development of targeted therapies by providing insights into resistance mechanisms and potential combination treatments with other anticancer agents. Its application remains primarily in experimental oncology rather than clinical use.