Poly(Glu, Tyr) sodium salt is widely used in biomedical research, particularly in the development of vaccines and immunotherapies. It serves as a synthetic polypeptide that mimics antigenic epitopes, making it valuable for studying immune responses and designing targeted treatments. In cancer research, it is employed to stimulate immune cells and evaluate their ability to recognize and attack tumor cells. Additionally, it is utilized in the creation of diagnostic tools to detect specific antibodies or immune markers in patient samples. Its biocompatibility and ability to form stable complexes with other molecules also make it suitable for drug delivery systems, where it can enhance the efficacy and specificity of therapeutic agents.