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Jacob Bledsoe, Z. Wallace, V. Deshpande, J. Richter, J. Klapman, A. Cowan, J. Stone, J. Ferry (2017)
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Ultrasensitive bright-field RNA in situ hybridization (BRISH) can be used to detect lower levels of light chain expression than immunohistochemical stains or conventional colorimetric RNA in situ hybridization. In this study, we retrospectively reviewed 77 lymph node specimens with follicular hyperplasia and kappa/lambda BRISH performed as part of the diagnostic evaluation. Thirty-two of the specimens had ≥1 germinal center(s) (GC) showing light chain restriction (14 specimens with lambda-restricted GC, 9 with kappa-restricted GC, and 9 with separate kappa-restricted or lambda-restricted GC). In all but 1 specimen, the light chain–restricted GC represented a minority of the total GC (average: 10%, range: 0.2% to 60%). There was no significant difference in age, sex, type of biopsy (core vs. excision), number of GCs, proportion of cases with a light chain–restricted B-cell population by flow cytometry, or proportion of cases with a positive IgH gene rearrangement study between the specimens with and without restricted GCs. In our cohort of follicular hyperplasia cases, BRISH identified light chain–restricted GC more frequently than flow cytometry identified a monotypic B-cell population. Our findings highlight the potential for overinterpretation of light chain restriction in limited samplings such as fine needle aspiration cell blocks or core needle sampling and reinforce that interpretation of BRISH staining needs to occur in the context of the morphologic features including tissue architecture and results of additional immunohistochemical stains.
The American Journal of Surgical Pathology – Wolters Kluwer Health
Published: Jun 20, 2023
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