IDO-IN-11 is primarily utilized in research focused on 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. Its application is significant in preclinical studies aimed at developing novel immunotherapeutic strategies, particularly in combination with other treatments like checkpoint inhibitors. Researchers also explore its potential in treating autoimmune diseases and chronic infections, where immune modulation is crucial.