Background：Utomilumab is the proposed non-proprietary name for PF-05082566, an investigational immunotherapy and a fully human IgG2 agonist monoclonal antibody mAb that binds to the extracellular domain of human 4-1BB/CD137 with high affinity and specificity. It is developed by Pfizer to treat advanced cancers either alone or in combination with other therapies. When utomilumab is injected into a person's bloodstream, it binds to 4-1BB on immune cells and stimulates them. At present, the approval of the monoclonal antibody has not been disclosed in the relevant authoritative drug approval agency, such as the European Medicines Agency and the U.S. Food and Drug Administration FDA.
