Prodromal myeloproliferative neoplasms: The 2008 WHO classification

Kvasnicka, Hans Michael; Thiele, Jüergen

doi:10.1002/ajh.21543

Cited by 85 publications

(72 citation statements)

References 124 publications

(313 reference statements)

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“…It is also important to note that other JAK2/CALR/MPL mutated MPN (or myelodysplastic syndromes [MDS]/MPN) can mimic ET in their presentation; these include prefibrotic PMF [4,43] and refractory anemia with ring sideroblasts with marked thrombocytosis (RARS-T) [4,44]. Therefore, bone marrow examination is often necessary to make an accurate morphologic diagnosis of ET and distinguish it from other myeloid neoplasms, especially from prefibrotic PMF; megakaryocytes in ET are large and mature-appearing whereas those in prefibrotic PMF display abnormal maturation with hyperchromatic and irregularly folded nuclei [45]. A recent large international study confirmed the prognostic relevance of distinguishing ET from pre-fibrotic PMF [26].…”

Section: Diagnosismentioning

confidence: 99%

Polycythemia vera and essential thrombocythemia: 2015 update on diagnosis, risk‐stratification and management

2015

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Disease overview: Polycythemia vera (PV) and essential thrombocythemia (ET) are myeloproliferative neoplasms, respectively characterized by erythrocytosis and thrombocytosis. Other disease features include leukocytosis, splenomegaly, thrombosis, bleeding, microcirculatory symptoms, pruritus, and risk of leukemic or fibrotic transformation. Diagnosis: PV is defined by a JAK2 mutation, whose absence, combined with normal or increased serum erythropoietin level, makes the diagnosis unlikely. Differential diagnosis in ET includes reactive thrombocytosis, chronic myeloid leukemia, and prefibrotic myelofibrosis. Janus kinase 2 (JAK2), calreticulin (CALR), or myeloproliferative leukemia virus oncogene (MPL) mutations occur in approximately 55%, 25%, and 3% of ET patients, respectively. The same molecular markers are also present in prefibrotic myelofibrosis, which needs to be morphologically distinguished from ET. Survival and leukemic/fibrotic transformation: Median survivals are ∼14 years for PV and 20 years for ET; the corresponding values for younger patients are 24 and 33 years. Life‐expectancy in ET is inferior to the control population. JAK2/CALR mutational status does not affect survival in ET. Risk factors for survival in ET and PV include advanced age, leukocytosis, and thrombosis. Leukemic transformation rates at 20 years are estimated at <10% for PV and 5% for ET; fibrotic transformation rates are slightly higher. Thrombosis risk stratification: Current risk stratification in PV and ET is designed to estimate the likelihood of recurrent thrombosis: high‐risk is defined by the presence of age >60 years or presence of thrombosis history; low‐risk is defined by the absence of both of these two risk factors. Recent data consider JAK2V617F and cardiovascular risk factors as additional risk factors. Presence of extreme thrombocytosis might be associated with acquired von Willebrand syndrome (AvWS) and, therefore, risk of bleeding. Risk‐adapted therapy: The main goal of therapy in PV and ET is to prevent thrombohemorrhagic complications. In low risk patients, this is accomplished by the use of low‐dose aspirin and phlebotomy (hematocrit target <45%) in PV. In high risk (for thrombosis) patients, treatment with hydroxyurea is additionally recommended. Treatment with busulfan or interferon‐α is usually effective in hydroxyurea failures and the additional value of JAK inhibitor therapy in such cases is limited. Screening for AvWS is recommended before administrating aspirin, in the presence of extreme thrombocytosis. Am. J. Hematol. 90:163–173, 2015. © 2014 Wiley Periodicals, Inc.

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Section: Diagnosismentioning

confidence: 99%

Polycythemia vera and essential thrombocythemia: 2015 update on diagnosis, risk‐stratification and management

2015

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“…In its most recent (2016) revision [54], the WHO document lists the presence of driver mutations as one of several major criteria in the diagnosis of PV, ET and PMF (Table I) [54]. However, these mutations lack specificity and are unable to distinguish ET from masked PV or prefibrotic PMF [55][56][57][58][59]. Accordingly, bone marrow morphology is now considered as another major criterion for the 2016 WHO diagnosis of all three MPN (Table I) [54].…”

Section: Advances In Diagnosticsmentioning

confidence: 99%

Myeloproliferative neoplasms: A decade of discoveries and treatment advances

2015

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Myeloproliferative neoplasms (MPN) are clonal stem cell diseases, first conceptualized in 1951 by William Dameshek, and historically included chronic myeloid leukemia (CML), polycythemia vera (PV), essential thrombocythemia (ET), and primary myelofibrosis (PMF). In 1960, Nowell and Hungerford discovered an invariable association between the Philadelphia chromosome (subsequently shown to harbor the causal BCR‐ABL1 mutation) and CML; accordingly, the term MPN is primarily reserved for PV, ET, and PMF, although it includes other related clinicopathologic entities, according to the World Health Organization (WHO) classification system. In 2005, William Vainchenker and others described a Janus kinase 2 mutation (JAK2V617F) in MPN and this was followed by a series of additional descriptions of mutations that directly or indirectly activate JAK‐STAT: JAK2 exon 12, myeloproliferative leukemia virus oncogene (MPL) and calreticulin (CALR) mutations. The discovery of these, mostly mutually exclusive, “driver” mutations has contributed to revisions of the WHO diagnostic criteria and risk stratification in MPN. Mutations other than JAK2, CALR and MPL have also been described in MPN and shown to provide additional prognostic information. From the standpoint of treatment, over the last 50 years, Louis Wasserman from the Unites States and Tiziano Barbui from Italy had skillfully organized and led a number of important clinical trials, whose results form the basis for current treatment strategies in MPN. More recently, allogeneic stem cell transplant, as a potentially curative treatment modality, and JAK inhibitors, as palliative drugs, have been added to the overall therapeutic armamentarium in myelofibrosis. In the current review, I will summarize the important advances made in the last 10 years regarding the science and practice of MPN. Am. J. Hematol. 91:50–58, 2016. © 2015 Wiley Periodicals, Inc.

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“…The diagnosis of post-PV or post-ET MF should adhere to criteria recently published by the International Working Group for MPN Research and Treatment (IWG-MRT) (Table IV) [12]. Peripheral blood leukoerythroblastosis (i.e., presence of nucleated red cells, immature granulocytes, and dacryocytes) is a typical but not invariable feature of PMF; prefibrotic PMF might not display overt leukoerythroblastosis [13]. Bone marrow fibrosis in PMF is usually associated with JAK2V617F or mutant CALR, or MPL, trisomy 9, or del(13q) [14,15].…”

Section: Diagnosismentioning

confidence: 99%

Primary myelofibrosis: 2014 update on diagnosis, risk‐stratification, and management

Tefferi

2014

American J Hematol

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Disease overview: Primary myelofibrosis (PMF) is a myeloproliferative neoplasm characterized by stem cell‐derived clonal myeloproliferation, abnormal cytokine expression, bone marrow fibrosis, anemia, splenomegaly, extramedullary hematopoiesis (EMH), constitutional symptoms, cachexia, leukemic progression, and shortened survival. Diagnosis: Diagnosis is based on bone marrow morphology. The presence of JAK2, CALR, or MPL mutation is supportive but not essential for diagnosis; approximately 90% of patients carry one of these mutations and 10% are “triple‐negative.” None of these mutations are specific to PMF and are also seen in essential thrombocythemia (ET). Prefibrotic PMF mimics ET in its presentation and the distinction, enabled by careful bone marrow morphological examination, is prognostically relevant. Differential diagnosis also includes chronic myeloid leukemia, myelodysplastic syndromes, chronic myelomonocytic leukemia, and acute myeloid leukemia.Risk Stratification: The Dynamic International Prognostic Scoring System‐plus (DIPSS‐plus) uses eight predictors of inferior survival: age >65 years, hemoglobin <10 g/dL, leukocytes >25 × 109/L, circulating blasts ≥1%, constitutional symptoms, red cell transfusion dependency, platelet count <100 × 109/L, and unfavorable karyotype (i.e., complex karyotype or sole or two abnormalities that include +8, −7/7q−, i(17q), inv(3), −5/5q−, 12p−, or 11q23 rearrangement). The presence of 0, 1, “2 or 3,” and ≥4 adverse factors defines low, intermediate‐1, intermediate‐2, and high‐risk disease with median survivals of approximately 15.4, 6.5, 2.9, and 1.3 years, respectively. High risk disease is also defined by CALR−/ASXL1+ mutational status. Risk‐Adapted Therapy: Observation alone is adequate for asymptomatic low/intermediate‐1 risk disease, especially with CALR+/ASXL1− mutational status. Stem cell transplant is considered for DIPSS‐plus high risk disease or any risk disease with CALR−/ASXL1+ mutational status. Investigational drug therapy is reasonable for symptomatic intermediate‐1 or intermediate‐2 risk disease. Splenectomy is considered for drug‐refractory splenomegaly. Involved field radiotherapy is most useful for post‐splenectomy hepatomegaly, non‐hepatosplenic EMH, PMF‐associated pulmonary hypertension, and extremity bone pain. Am. J. Hematol. 89:916–925, 2014. © 2014 Wiley Periodicals, Inc.

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Prodromal myeloproliferative neoplasms: The 2008 WHO classification

Cited by 85 publications

References 124 publications

Polycythemia vera and essential thrombocythemia: 2015 update on diagnosis, risk‐stratification and management

Polycythemia vera and essential thrombocythemia: 2015 update on diagnosis, risk‐stratification and management

Myeloproliferative neoplasms: A decade of discoveries and treatment advances

Primary myelofibrosis: 2014 update on diagnosis, risk‐stratification, and management

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