Peresolimab's Potential in Rheumatoid Arthritis Peresolimab is a humanized IgG1 monoclonal antibody that acts as a PD-1 agonist (stimulator). The NEJM reports that PER met its efficacy primary endpont in treating patients with active RA. https://t.co/B3tApMEWI3 https://t.co/Qi3WQkwvRd