HKI 357 is primarily utilized in the field of medical research, particularly in the study of cancer therapies. It functions as a potent inhibitor targeting specific kinases involved in cell signaling pathways that contribute to tumor growth and proliferation. Researchers employ HKI 357 to investigate its efficacy in blocking these pathways, thereby potentially halting the progression of certain cancers. Its application extends to preclinical studies, where it is used to evaluate its impact on cancer cell lines and animal models. This compound aids in understanding the mechanisms of kinase inhibition and its potential as a therapeutic agent in oncology.