Paroxysmal Nocturnal Hemoglobinuria (PNH)

Dr. Leguizamo is a member of the American Society of Hematology, the Georgia Society of Clinical Oncology, the American Society of Clinical Oncology, and the International PNH interest group. He is also a Fellow of the American College of Physicians. Dr. Leguizamo speaks Spanish fluently.

Dr. Niyongere joined the School of Medicine and Marlene and Stewart Greenebaum Comprehensive Cancer Center as an Assistant Professor in 2018. Her clinical focus is in acute leukemias, myelodysplastic syndromes, myeloproliferative neoplasms and bone marrow failure syndromes. Dr. Niyongere’s primary research interests are in finding new therapeutic targets by understanding oncogenic signaling pathways involved in AML and MDS as well as studying the role of the tumor microenvironment in the development of chemoresistance in leukemia. Dr. Niyongere also serves as an attending physician on the

James R. Cook, M.D., Ph.D., is a Professor of Pathology at the Cleveland Clinic Lerner College of Medicine. He serves as Section Head of Hematopathology in the Department of Laboratory Medicine. Dr. Cook's clinical interests focus on diagnostic hematopathology and molecular diagnostics. His research interests include diagnostic and prognostic markers in non-Hodgkin lymphoma and plasma cell disorders, and molecular diagnosis of leukemia and lymphoma. He participates in numerous multi-institutional research efforts including the Lymphoma and Leukemia Molecular Profiling Project (LLMPP) and the