Abstract
Evaluation of B-cell clonality can be challenging in the interpretation of lymphoid infiltrates on tissue sections. Clonality testing based on IG gene rearrangements analysis by PCR (IG-PCR) is the gold standard. Alternatively, B-cell clonality can be assessed by the recognition of immunoglobulin light chain (IgLC) restriction, by immunohistochemistry (IHC), chromogenic in situ hybridization (ISH) or flow cytometry (FC). IG-PCR requires molecular facilities, and FC requires cell suspensions, both not widely available in routine pathology units. This study evaluates the performance of B-cell clonality detection by IgLC-RNAscope® (RNAsc) in a group of 216 formalin-fixed, paraffin-embedded samples including 185 non-Hodgkin B-cell lymphomas, 11 Hodgkin lymphomas (HL) and 20 reactive samples. IgLC-RNAsc, performed in parallel with FC in 53 cases, demonstrated better performances (93% vs 83%), particularly in diffuse large B-cell lymphoma (98% vs 71%) and follicular lymphoma (93% vs 83%) diagnosis. IgLC-RNAsc was also superior to IHC and ISH especially in samples with limited tumor cell content, where IG-PCR was not informative. Performed for the first time on mediastinal lymphomas, IgLC-RNAsc identified monotypic IgLC transcripts in 69% of primary mediastinal large B-cell lymphoma (PMBCL) and 67% of mediastinal gray zone lymphomas (MGZL). IGK/L double-negative cells were detected in 1 PMBCL, 2 MGZL, and all classical HL, while monotypic IgLC expression appeared to be a hallmark in nodular lymphocyte-predominant HL. IgLC-RNAsc demonstrates to be a powerful tool in B-cell lymphoma diagnosis, above all in challenging cases with limited tumor cell content, ensuring in situ investigations on mechanisms of Ig regulation across lymphoma entities.
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The data that support the findings of this study are available on request from the corresponding author (LL).
Change history
16 November 2023
A Correction to this paper has been published: https://doi.org/10.1007/s00428-023-03705-4
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Funding
Economical support was provided by the Italian Ministry of University to FF (PRIN 2017ZXT5WR). CS was supported by the Italian Association for Cancer Research (AIRC; IG grant no. 23747). ZS activity was supported by Fondazione Beretta (Brescia, Italy).
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FF and LL conceived and designed the study; LL, LS, BM, ZS, BuM, VA, BP, GV, GA, CM, and WV performed the experiments; MF, FM, GI, VV, PM, and APDT contributed with critical discussion on samples diagnosis; LL, BM, and LS analyzed the data; LL, CS, and FF contributed to interpretation of the results. All authors read and approved the manuscript.
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Experiments included in this study on human tissue were approved by the Local Ethical Committee (study FF-BCR2, code NP 3719).
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Lorenzi, L., Lonardi, S., Bonezzi, M. et al. Immunoglobulin light chain transcript detection by ultrasensitive RNA in situ hybridization for B-cell lymphoma diagnosis. Virchows Arch (2023). https://doi.org/10.1007/s00428-023-03682-8
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DOI: https://doi.org/10.1007/s00428-023-03682-8