Revised response criteria for polycythemia vera and essential thrombocythemia: an ELN and IWG-MRT consensus project

Giovanni Barosi, Ruben Mesa, Guido Finazzi, Claire Harrison, Jean-Jacques Kiladjian, Eva Lengfelder, Mary F McMullin, Francesco Passamonti, Alessandro M Vannucchi, Carlos Besses, Heinz Gisslinger, Jan Samuelsson, Srdan Verstovsek, Ronald Hoffman, Animesh Pardanani, Francisco Cervantes, Ayalew Tefferi, Tiziano Barbui

Research output: Contribution to journalArticlepeer-review

210 Citations (Scopus)


Standardized response criteria to interpret and compare clinical trials are needed for approval of new therapeutic agents by regulatory agencies. The European LeukemiaNet (ELN) response criteria for essential thrombocythemia (ET) and polycythemia vera (PV) issued in 2009 have been widely adopted as end points in a number of recent clinical trials. However, evidence exists that they do not predict response or provide clinically relevant measures of benefit for the patients. This article presents revised recommendations for assessing response in ET and PV provided by a working group established by ELN and International Working Group-Myeloproliferative Neoplasms Research and Treatment. New definitions of complete and partial remission incorporate clinical, hematological, and histological response assessments that include a standardized symptom assessment form and consider absence of disease progression and vascular events. We anticipate that these criteria will be adopted widely to facilitate the development of new and more effective therapies for ET and PV.
Original languageEnglish
Pages (from-to)4778-4781
Issue number23
Publication statusPublished - 06 Jun 2013


  • Consensus
  • Humans
  • International Agencies
  • Platelet Aggregation Inhibitors
  • Polycythemia Vera
  • Practice Guidelines as Topic
  • Societies, Medical
  • Thrombocythemia, Essential


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