Research into Philadelphia-negative chronic myeloproliferative neoplasms is heterogeneous. In addition, no systematization of studies of polycythemia vera (PV), essential thrombocythemia (ET) or primary myelofibrosis (PMF) have been carried out. | Systematization of analytical studies of polycythemia vera essential thrombocythemia and primary myelofibrosis and a meta-analysis of the frequency of JAK2 CALR and MPL mutations 2000 2018