Abstract
Introduction
Different strategies have been developed to identify those refractory celiac disease (RCD) patients who are at risk to develop an enteropathy associated T-cell lymphoma (EATL). Flow cytometric analysis of intra-epithelial lymphocytes (IEL) with an aberrant phenotype is considered the golden standard but is not widely available. Immunohistochemistry (IHC) and T-cell receptor (TCR) rearrangement studies are commonly available but may lack sensitivity and specificity. Here, we compared the three different methods in the workup of patients suspected for RCD.
Methods
Duodenal biopsies from control patient (n = 5), RCD patients with moderately increased aberrant IEL populations (20–50 %: n = 14), and RCD patients with high numbers of aberrant IEL (>50 %: n = 5) as determined by flow cytometry were analysed by IHC and TCR-γ chain rearrangement analysis. Three pathologists scored the slides independently.
Results
Sensitivity of IHC and TCR-γ rearrangement analysis in RCD patients with high numbers of aberrant IELs was 100 and 71 %, respectively. RCD patients with aberrant cells between 25 and 50 % however, were missed by IHC and TCR in 50 and 57 % of cases, respectively. In addition, inter-rater reliability analysis of the IHC scoring revealed coder-pair Kappa coefficients between 0.28 and 0.85.
Conclusion
Immunohistochemistry and to a lesser extent TCR-γ clonality analysis are sensitive in identifying patients with high numbers of aberrant IEL populations, yet miss half of RCD patients with moderately increased numbers. In addition, IHC has a high inter-observer variability. Therefore, patients suspected for RCD should undergo flow cytometric analysis of the duodenum.
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Authorship Contributions
RLJVW designed and conducted the study, performed laboratory studies and wrote the manuscript. DMJM performed laboratory studies.
EANB, JM and LGK evaluated histological slides.
HJB and BMEVB performed and evaluated flow cytometric data.
DAMH performed and evaluated clonality analysis.
GB and CJJM designed and supervised the study, and wrote the manuscript.
Funding
This work was supported by the Coeliac Disease Consortium, The Netherlands.
Competing Interest
None of the authors states a conflict of interest.
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van Wanrooij, R.L.J., Müller, D.M.J., Neefjes-Borst, E.A. et al. Optimal Strategies to Identify Aberrant Intra-Epithelial Lymphocytes in Refractory Coeliac Disease. J Clin Immunol 34, 828–835 (2014). https://doi.org/10.1007/s10875-014-0075-7
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DOI: https://doi.org/10.1007/s10875-014-0075-7