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• W3046793344 abstract "Abstract Introduction Myeloid neoplasm with blasts showing mast cell (MC)‐differentiation and MC‐component less than 10% of all nucleated cells but not fulfilling the criteria for systemic mastocytosis with associated hematological neoplasm (SM‐AHN) or myelomastocytic leukemia (MML) has not been described in the literature. Herein, we report a study of diverse myeloid malignancies with blasts showing MC‐differentiation but not meeting the criteria for SM‐AHN or MML. We also evaluated the utility of flow‐cytometric immunophenotyping (FCI) in the characterization of immature‐MCs (iMCs). Methods We identified nine patients of myeloid neoplasms and studied their morphological, FCI, immunohistochemistry, cytogenetic and molecular characteristics. We also compared the immunophenotypic features of MCs from patient samples with control samples. Results The study included patients with newly‐diagnosed acute myeloid leukemia ( n = 4), chronic myelomonocytic leukemia ( n = 1), and chronic myeloid leukemia on follow‐up ( n = 4) showing MC differentiation in leukemic‐blasts. These patients had mildly increased MCs (range, 0.5%–3%) in bone‐marrow morphology, including immature‐forms and did not meet the criteria for either SM‐AHN or MML. On FCI, iMCs were positive for bright‐CD117, heterogeneous‐CD34, dim‐to‐negative‐HLADR, and moderate‐CD203c expression. Expression‐levels of CD123 and CD38 were higher ( p < 0.001) but CD33 and CD45 were lower in iMCs compared to mature‐MC from control samples ( p = 0.019 and p = 0.0037). Conclusion We reported a rare finding of MC differentiation of leukemic blasts in diverse myeloid neoplasms and proposed it as a potential pre‐myelomastocytic leukemia condition. We described the distinct immunophenotypic signature of immature‐MCs using commonly used markers and highlighted the utility of FCI for the diagnosis of this entity." @default.
• W3046793344 created "2020-08-07" @default.
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• W3046793344 date "2020-08-01" @default.
• W3046793344 modified "2023-09-27" @default.
• W3046793344 title "Mast cell differentiation of leukemic blasts in diverse myeloid neoplasms: A potential pre‐myelomastocytic leukemia condition" @default.
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• W3046793344 doi "https://doi.org/10.1002/cyto.b.21938" @default.
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