Extension of 2016 World Health Organization (WHO) Classification into a New Set of Clinical, Laboratory, Molecular, and Pathological Criteria for the Diagnosis of Myeloproliferative Neoplasms: From Dameshek to Vainchenker, Green, and Kralovics

*Jan Jacques Michiels,1,2,3 Hendrik De Raeve,4 Francisca Valster,3 Vincent Potters,3 Yonggoo Kim,5,6 *Myungshin Kim5,6

1. International Hematology, Blood and Coagulation Research Center, Goodheart Institute and Foundation in Nature Medicine, Freedom in Science and Education Erasmus Tower, Rotterdam, Netherlands
2. International Collaboration and Academic Research on Myeloproliferative Neoplasms:
ICAR.MPN, Rotterdam, Netherlands
3. Department of Hematology and Pathology, BRAVIS Hospital, Bergen op Zoom, Netherlands
4. Department of Pathology, OLV Hospital Aalst and University Hospital Brussels, Brussels, Belgium
5. Department of Laboratory Medicine, College of Medicine, the Catholic University of Korea, Seoul, Korea
6. Catholic Genetic Laboratory Center, Seoul St. Mary’s Hospital, College of Medicine, the Catholic University of Korea, Seoul, Korea
*Correspondence to goodheartcenter@upcmail.nl and microkim@catholic.ac.kr

Authors’ Contributions: Jan Jacques Michiels wrote the manuscript and analysed the literature. Jan Jacques Michiels and Francisca Valster collected the clinical, laboratory, molecular, and pathological (CLMP) data. Hendrik De Raeve and Vincent Potters performed the bone marrow studies. Yonggoo Kim and Myungshin Kim translated the World Health Organization (WHO) classification into the CLMP classification of myeloproliferative neoplasms.
Disclosure: The authors have declared no conflicts of interest.
Received: 16.09.16 Accepted: 20.03.17
Citation: EMJ. 2017;2[2]:72-81.


Improved Clinical, Laboratory, Molecular, and Pathological (CLMP) 2017 criteria for myeloproliferative neoplasms (MPN) define the JAK2V617F trilinear MPNs as a broad continuum of essential thrombocythaemia (ET), polycythaemia vera (PV), masked PV, and post-ET or post-PV myelofibrosis (MF). Normal versus increased erythrocyte counts (5.8×1012/L) on top of bone marrow histology separate JAK2V617F ET and prodromal PV from early and classical PV. Bone marrow histology of the JAK2V617F trilinear MPNs show variable degrees of normocellular megakaryocytic, erythrocytic megakaryocytic and erythrocytic megakaryocytic granulocytic (EMG) myeloproliferation, peripheral cytoses, and splenomegaly related to JAK2V617F allele burden. MPL515 thrombocythaemia displays predominantly normocellular megakaryocytic proliferation. CALR thrombocythaemia intially presents with megakaryocytic followed by dual granulocytic and megakaryocytic myeloproliferation without features of PV. The megakaryocytes are large, mature, and pleomorphic with hyperlobulated nuclei in JAK2V617F ET and prodromal, classical, and masked PV. The megakaryocytes are large to giant with hyperlobulated staghorn-like nuclei in MPL515 thrombocythaemia. The megakaryocytes are densely clustered, large, and immature dysmorphic with bulky (bulbous) hyperchromatic nuclei in CALR thrombocythaemia and MF.

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