ADU-S100 disodium salt is primarily utilized in the field of immunotherapy, specifically as a stimulator of interferon genes (STING) agonist. It plays a critical role in activating the innate immune system, making it a promising candidate for cancer treatment. By triggering the STING pathway, it induces the production of cytokines and chemokines, which enhance the immune response against tumor cells. This mechanism makes it particularly effective in combination with other immunotherapies, such as checkpoint inhibitors, to improve anti-tumor activity. Additionally, it is being explored in preclinical and clinical studies for its potential in treating viral infections and as an adjuvant in vaccines to boost immune responses. Its ability to modulate the immune system positions it as a versatile tool in both oncology and infectious disease research.