NR4A3 Immunostain Is a Highly Sensitive and Specific Marker for Acinic Cell Carcinoma in Cytologic and Surgical Specimens

Kartik Viswanathan, Shaham Beg, Bing He, Taotao Zhang, Richard Cantley, Daniel J. Lubin, Qiuying Shi, Zahra Maleki, Saeed Asiry, Rema Rao, Nora Katabi, Masato Nakaguro, William C. Faquin, Peter M. Sadow, Momin T. Siddiqui, Theresa Scognamiglio

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

OBJECTIVES: Salivary gland acinic cell carcinoma (AciCC) has recognizable cytomorphologic features that can overlap with benign and malignant entities, creating a diagnostic challenge. AciCC harbors a t(4;9) translocation increasing nuclear receptor subfamily 4 group A member 3 (NR4A3) expression, detectable by immunohistochemistry (IHC) on surgical resection (SR). NR4A3 IHC cytology data are limited. Here, we examine NR4A3 IHC on smears, cell blocks (CBs), and SRs of AciCC and its mimickers. METHODS: Our cohort comprised AciCC (including high-grade transformation), secretory carcinoma, mucoepidermoid carcinoma (MEC), Warthin tumor, pleomorphic adenoma (PA), cellular PA, carcinoma ex-PA, oncocytic carcinoma, oncocytoma, and nodular oncocytosis. NR4A3 IHC (Santa Cruz Biotechnology and Origene antibodies) was positive if more than 5% tumor cells showed nuclear staining. RESULTS: Among CBs, 90% of AciCC cases and none of the mimickers expressed NR4A3. Among SRs, 100% of AciCC cases showed diffuse NR4A3, whereas one high-grade MEC expressed focal NR4A3. Concordance was 95% with two antibody clones. Sensitivity, specificity, positive predictive value, and negative predictive value were 90%, 100%, 100%, and 94.7% for CBs and 100%, 98.8%, 92.3%, and 100% for SRs, respectively. NR4A3 immunostaining was demonstrable on smears from an AciCC case. CONCLUSIONS: NR4A3 IHC can be a robust diagnostic tool to identify AciCC, especially for cytology specimens.

Original languageEnglish (US)
Pages (from-to)98-108
Number of pages11
JournalAmerican journal of clinical pathology
Volume157
Issue number1
DOIs
StatePublished - Jan 6 2022
Externally publishedYes

Keywords

  • Acinic cell carcinoma
  • NR4A3
  • Oncocytic
  • Salivary

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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