Monopar Therapeutics Inc., a clinical-stage biopharmaceutical company, engages in developing therapeutics for the treatment of cancer in the United States. The company develops ALXN1840, a late-stage, investigational once-daily and oral medicine; MNPR-101, a proprietary humanized monoclonal antibody that is conjugated with different radioisotopes for the treatment of advanced solid tumors expressing urokinase plasminogen activator receptor; and MNPR-101-Zr, a clinical-stage radiodiagnostic imaging agent comprised of MNPR-101 conjugated to zirconium-89. It develops MNPR-101-Lu, a late-preclinical stage radiotherapeutic comprised of MNPR-101 conjugated to actinium-225. The company has collaborations NorthStar to develop radio-immuno-therapeutics targeting severe COVID-19. The company was founded in 2014 and is headquartered in Wilmette, Illinois.