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Haller, Florian; Skálová, Alena; Ihrler, Stephan; Märkl, Bruno; Bieg, Matthias; Moskalev, Evgeny A; Erber, Ramona; Blank, Susanne; Winkelmann, Christa; Hebele, Simone; Baněčková, Martina; Wiemann, Stefan; Müller, Sarina; Zenk, Johannes; Eils, Roland; Iro, Heinrich; Hartmann, Arndt; Agaimy, Abbas
The American journal of surgical pathology, 2019-September, 2019-09-00, 20190901, Volume: 43, Issue: 9Journal Article
Recently, we discovered the recurrent genomic rearrangement t(4;9)(q13;q31) enabling upregulation of the transcription factor Nuclear Receptor Subfamily 4 Group A Member 3 (NR4A3) through enhancer hijacking as the oncogenic driver event in acinic cell carcinoma (AciCC) of the salivary glands. In the current study, we evaluated the usefulness of NR4A3 immunostaining and NR4A3 fluorescence in situ hybridization (FISH) in the differential diagnosis of AciCC, comparing a total of 64 AciCCs including 17% cases with high-grade transformation, 29 secretory (mammary analog) carcinomas (MASC), and 70 other salivary gland carcinomas. Nuclear NR4A3 immunostaining was a highly specific (100%) and sensitive (98%) marker for AciCC with only 1 negative case, whereas NR4A3 FISH was less sensitive (84%). None of the MASCs or other salivary gland carcinomas displayed any nuclear NR4A3 immunostaining. The recently described HTN3-MSANTD3 gene fusion was observed in 4 of 49 (8%) evaluable AciCCs, all with nuclear NR4A3 immunostaining. In summary, NR4A3 immunostaining is a highly specific and sensitive marker for AciCC, which may be especially valuable in cases with high-grade transformation and in “zymogen granule”-poor examples within the differential diagnostic spectrum of AciCC and MASC.
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