- Have discontinued all previous approved therapies for MF, including any chemotherapy, immunomodulating therapy (for example, thalidomide, interferon-alpha), immunosuppressive therapy (for example, corticosteroids >10 mg/day prednisone or equivalent), radiotherapy, and erythropoietin, thrombopoietin, or granulocyte colony-stimulating factor (GSF) for at least 14 days and recovered from the acute effects of therapy. Hydroxyurea used to control blood cell counts is permitted at study entry if the participant has been maintained on a stable dose for at least 4 weeks. Low dose acetylsalicylic acid (aspirin; 81 or 100 mg) is permitted as well