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Appearance of a new splenomegaly that is palpable at least 5 cm below the left costal margin or A greater than or equal to 100 percent increase in palpable distance, below left costal margin, for baseline splenomegaly of 5 to 10 cm or A 50 percent increase in palpable distance, below left costal margin, for baseline splenomegaly of greater than 10 cm or Leukemic transformation confirmed by a bone marrow blast count of greater than or equal to 20 percent or A peripheral blood blast content of greater than or equal to 20 percent associated with an absolute blast count of greater than or equal to 1x10^9/L that lasts for at least 2 weeks (adapted from Revised Response Criteria for Myelofibrosis: International Working Group-Myeloproliferative Neoplasms Research and Treatment (IWG-MRT) and European LeukemiaNet (ELN) consensus report. BLOOD, 22 AUGUST 2013 x VOLUME 122, NUMBER 8)
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