MedicalResearch.com Interview with: Jerry Spivak, M.D Professor of Medicine and Oncology Director, Center for the Chronic Myeloproliferative Disorders John Hopkins Medicine Medical Research: What are the main findings of the study? Dr. Spivak: The main findings of this study are that polycythemia vera occurs in two clinical forms: an indolent form in which only phlebotomy may be necessary and a more aggressive form requiring myelosuppressive therapy and that these two forms of the disease can be distinguished genetically.