Novel JAK2 Exon 14 Mutations L611S or N622Y in cis with JAK2V617F Are Associated with Distinct Clinical Phenotype of Polycythemia Vera and Concurrent Eosinophilia.

Abstract excerpt

Eosinophilic phenotypes in polycythemia vera (PV) and essential thrombocythemia (ET) are rare and poorly characterized. Co-occurring JAK2 mutations in cis, specifically L611S or N622Y mutations, appear to result in a more aggressive clinical phenotype. PV/ET with eosinophilic phenotypes may require full next-generation sequencing to capture co-occurring mutations as opposed to more prevalent single-gene assays....

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