mPEG-EO is widely used in the pharmaceutical and biotechnology industries for drug delivery systems. It is commonly employed to modify proteins, peptides, and other therapeutic agents to enhance their solubility, stability, and circulation time in the body. This modification, known as PEGylation, helps reduce immunogenicity and prevents rapid degradation by the immune system. Additionally, mPEG-EO is utilized in the development of hydrogels and other biomaterials for controlled drug release and tissue engineering applications. Its biocompatibility and ability to form micelles make it valuable in targeted cancer therapies, where it helps improve the delivery of chemotherapeutic agents to tumor sites while minimizing side effects.