Clinical predictors of outcome in MPN.

Myeloproliferative neoplasms include 3 diseases: polycythemia vera (PV), essential thrombocythemia (ET), and primary myelofibrosis (PMF). PV and ET are dominated by a high risk of thrombosis and a late risk of clonal evolution into secondary MF and acute myeloid leukemia. Patients with PMF may encounter many complications associated with disease progression or with PMF evolution. This article defines factors that determine prognosis in these 3 diseases.