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To the editor: Approximately 90% of patients with primary myelofibrosis (PMF) harbor JAK2 (58%), CALR (25%), or MPL (7%) mutations.11⇓2-33 CALR -mutated PMF patients are younger than their JAK2 -mutated counterparts, and they display higher platelet count, lower leukocyte count,
Tefferi et al. (Thu,) studied this question.
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