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Flow cytometry immunophenotypic analysis of philadelphia‐negative myeloproliferative neoplasms: Correlation with histopathologic features
Author(s) -
Ouyang Juan,
Zheng Wenli,
Shen Qi,
Goswami Maitrayee,
Jorgensen Jeffrey L.,
Medeiros L. Jeffrey,
Wang S. A.
Publication year - 2014
Publication title -
cytometry part b: clinical cytometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 61
eISSN - 1552-4957
pISSN - 1552-4949
DOI - 10.1002/cyto.b.21215
Subject(s) - myelofibrosis , immunophenotyping , essential thrombocythemia , medicine , pathology , polycythemia vera , myeloproliferative neoplasm , bone marrow , dysplasia , cd34 , myelodysplastic syndromes , gastroenterology , flow cytometry , immunology , stem cell , biology , genetics
Background Compared with the proven utility of flow cytometry immunophenotyping (FCI) analysis in the workup of myelodysplastic syndromes (MDS), immunophenotypic alterations in myeloproliferative neoplasms (MPN) have been less studied and the potential utility of FCI is not defined. Methods Bone marrow (BM) samples of 83 Philadelphia‐negative MPN patients were assessed by multicolor FCI including 27 with essential thrombocythemia (ET); 17 polycythemia vera (PV); 33 primary myelofibrosis (PMF) and 6 MPN‐unclassifiable (MPN‐U). The time interval from initial diagnosis of MPN to FCI analysis was 18 months (0–370). Ninety‐five age‐matched MDS patients with a similar BM blast count were included for comparison. Results Immunophenotypic alterations, either in CD34 + cells or myelomonocytic cells, were detected in 82 of 83 (99%) MPN cases. FCI abnormalities were more frequently observed in cases with substantial myelofibrosis but not different between PMF and fibrotic stage of ET/PV. Furthermore, FCI abnormalities were more frequent in cases with ≥5% BM blasts and/or circulating blasts ( P = 0.006); as well as cases with an abnormal karyotype ( P = 0.036); but not associated with morphologic dysplasia or JAK2 mutation status. Comparing with MDS, FCI abnormalities were overall less pronounced in MPN cases ( P = 0.001). Conclusions MPNs exhibit frequent immunophenotypic alterations, more pronounced in cases with adverse histopathologic features. These findings illustrate that immunophenotypic alterations are a part of constellational findings in MPN, and correlate progressively with disease stage. The study results also suggest a role of FCI in diagnosis of MPN and monitoring disease over time and after therapy. © 2014 International Clinical Cytometry Society