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Licensed Unlicensed Requires Authentication Published by De Gruyter February 24, 2016

Performance of the XN-2000 WPC channel-flagging to differentiate reactive and neoplastic leukocytosis

  • Peter Schuff-Werner EMAIL logo , Peter Kohlschein , Aliaksandra Maroz , Joachim Linssen , Katrin Dreißiger and Christine Burstein



The distinction between reactive and neoplastic leukocytes, especially atypical lymphocytes suspected to be reactive or neoplastic, is a particular challenge in automated hematological cell differentiation. The aim of the study was to evaluate the performance of the XN analyzer supplemented with the WPC channel for differentiating between reactive and neoplastic leukocytosis.


Blood samples of 253 patients with viral infections, lymphoma or leukemia were analyzed by the Sysmex XN-2000 analyzer equipped with the WPC channel. The results were compared to routine leukocyte differentiation using the routine Sysmex XE-2100 analyzer and automated digital microscopy (DM96). The combined information from standard morphology, immune phenotyping and clinical diagnosis served as a reference.


The XN WPC channel demonstrated an excellent performance for differentiating neoplastic (AUC=0.933) and reactive leukocytosis (AUC=0.900) as compared to morphological smear examination (AUC=0.949 and AUC=0.968, respectively) or to the differentiation results of our routine hematology analyzer (AUC=0.630 and AUC=0.635, respectively).


Our data show that the combined WDF/WPC of the Sysmex XN-Series analyzer is advantageous in the automated differentiation of neoplastic and reactive leukocytosis, thus supporting the correct diagnostic decision in the daily laboratory routine.

Corresponding author: Peter Schuff-Werner, Rostock University Medical Center, Institute of Clinical Chemistry and Laboratory Medicine, Ernst-Heydemann-Str. 8, 18057 Rostock, Germany, E-mail: ;

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission. PSW and PK contributed equally to this paper.

  2. Research funding: The study was supported by a grant from Sysmex Europe, Norderstedt, to cover the cost of reagents. Travel costs declared by PSW for participation at scientific meetings were covered in part by Sysmex Europe.

  3. Employment or leadership: AM and JL are full time employees of Sysmex Europe.

  4. Honorarium: None declared.

  5. Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.


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Received: 2015-11-12
Accepted: 2016-1-6
Published Online: 2016-2-24
Published in Print: 2016-9-1

©2016 Walter de Gruyter GmbH, Berlin/Boston

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