Abstract：
:Abnormal nuclear megakaryocytic staining for phospho-STAT5 (pSTAT5) correlates with JAK2 V617F mutational status in non-chronic myelogenous leukemia chronic myeloproliferative disorders. However, a proportion of wild-type JAK2 non-chronic myelogenous leukemia chronic myeloproliferative disorders cases also demonstrate this abnormal pSTAT5 expression pattern. We report a patient with a JAK2 V617F-negative myeloproliferative/myelodysplastic syndrome who had abnormal megakaryocytic pSTAT5 expression and a MPL W515L mutation. The patient was a 71-year-old man with anemia and thrombocythemia on laboratory examination. His peripheral blood smear demonstrated occasional dysplastic neutrophils. Bone marrow biopsy revealed hypercellular marrow with features consistent with myeloproliferative/myelodysplastic syndrome. Immunohistochemistry for pSTAT5 showed abnormal nuclear megakaryocyte positivity. Cytogenetic analysis revealed a normal karyotype, fluorescence in situ hybridization for BCR-ABL was negative, and JAK2 genotyping demonstrated wild-type JAK2. However, MPL genotyping showed a MPL W515L mutation. Abnormal nuclear megakaryocytic staining for pSTAT5 expression, previously associated with the JAK2 V617F mutation, is also associated with MPL W515L, likely reflecting activation of the JAK-STAT signaling pathway.
journal_name
Hum Patholjournal_title
Human pathologyauthors
Gibson SE,Schade AE,Szpurka H,Bak B,Maciejewski JP,Hsi EDdoi
10.1016/j.humpath.2007.10.034subject
Has Abstractpub_date
2008-07-01 00:00:00pages
1111-4issue
7eissn
0046-8177issn
1532-8392pii
S0046-8177(07)00608-9journal_volume
39pub_type
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