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Comparison of reverse transcription quantitative real-time PCR, flow cytometry, and immunohistochemistry for detection of monoclonality in lymphomas.

Journal article
Authors Anders Ståhlberg
Pierre Åman
Linda Strömbom
Neven Zoric
Alfredo Diez
Olle Nilsson
Mikael Kubista
Börje Ridell
Published in ISRN oncology
Volume 2014
Pages 796210
ISSN 2090-5661
Publication year 2014
Published at Institute of Biomedicine, Department of Pathology
Sahlgrenska Cancer Center
Pages 796210
Language en
Links dx.doi.org/10.1155/2014/796210
Subject categories Basic Medicine, Cancer and Oncology

Abstract

In healthy humans, 60-70% of the B lymphocytes produce kappa light chains, while the remaining cells produce lambda light chains. Malignant transformation and clonal expansion of B lymphocytes lead to an altered kappa : lambda expression ratio, which is an important diagnostic criteria of lymphomas. Here, we compared three methods for clonality determination of suspected B cell lymphomas. Tumor biopsies from 55 patients with B cell malignancies, 5 B-lymphoid tumor cell lines, and 20 biopsies from patients with lymphadenitis were analyzed by immunohistochemistry, flow cytometry, and reverse transcription quantitative real-time PCR. Clonality was determined by immunohistochemistry in 52/53 cases, flow cytometry in 30/39 cases, and reverse transcription quantitative real-time PCR in 33/55 cases. In conclusion, immunohistochemistry was superior to flow cytometry and reverse transcription quantitative real-time PCR for clonality identification. Flow cytometry and reverse transcription quantitative real-time PCR analysis has complementary values. In a considerable number of cases tumor cells produced both kappa and lambda light chain transcripts, but only one type of light chain peptide was produced.

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