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- W4306247071 abstract "Abstract Objectives Rosai-Dorfman disease (RDD) is a rare disorder characterized by the accumulation of large S100 protein-positive histiocytes that typically exhibit emperipolesis. The recently reported expression of Oct-2 in RDD histiocytes led us to explore whether PU.1, a transcription factor that is required for monocyte and B-cell development, could similarly function as a diagnostic marker in RDD. Methods We evaluated the expression of PU.1 and Oct-2 using immunohistochemistry in 19 patients diagnosed with RDD involving nodal, extranodal, and cutaneous sites. Results Both PU.1 and Oct-2 were positive in all cases studied, with a strong intensity of staining in 84% of cases in which more than 50% of the lesional cells were positive. In three patients, both markers showed weak to moderate intensity of staining. Two patients had concomitant RDD and Langerhans cell histiocytosis in which PU.1 stained both types of histiocytes while Oct-2 stained only the RDD component. Conclusions PU.1 emerged as a robust marker with crisp nuclear staining in RDD histiocytes as well as in engulfed inflammatory cells. Strong coexpression of PU.1 and Oct-2 is a useful diagnostic marker in differentiating histiocytic/dendritic cell proliferations." @default.
- W4306247071 created "2022-10-15" @default.
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- W4306247071 date "2022-10-14" @default.
- W4306247071 modified "2023-10-16" @default.
- W4306247071 title "Strong Coexpression of Transcription Factors PU.1 and Oct-2 in Rosai-Dorfman Disease" @default.
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- W4306247071 doi "https://doi.org/10.1093/ajcp/aqac119" @default.
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