Study sites in China will also participate in a China-specific, single-arm, open label extension of the current study. Participants will have myeloproliferative neoplasm (MPN)-associated myelofibrosis and severe anemia and not be receiving red blood cell (RBC)-transfusions. Eligible participants will receive pomalidomide (0.5 mg/day) and will be evaluated on a schedule parallel to that of the global study.