Gemtuzumab ozogamicin is a monoclonal antibody used to treat acute myelogenous leukemia. It is a monoclonal antibody to CD33 linked to a cytotoxic agent, calicheamicin. CD33 is expressed in most leukemic blast cells but also in normal hematopoietic cells the intensity diminishing with maturation.stem cells. When given to patients in first relapse, 15% of patients achieve a complete remission. In the United States, it was approved by the FDA for...