IDO-IN-5 is primarily utilized in the field of biomedical research, particularly in the study of immunology and cancer therapy. It functions as an inhibitor of indoleamine 2,3-dioxygenase (IDO), an enzyme that plays a critical role in immune suppression within the tumor microenvironment. By blocking IDO, this compound helps to enhance the immune system's ability to recognize and attack cancer cells, making it a valuable tool in the development of immunotherapeutic strategies. Researchers use IDO-IN-5 to investigate its potential in combination with other treatments, such as checkpoint inhibitors, to improve therapeutic outcomes in various cancer types. Its application extends to preclinical studies aimed at understanding the mechanisms of immune evasion and developing novel approaches to bolster anti-tumor immunity.