Abstract
Background
Salivary gland intraductal papillary mucinous neoplasm (SG IPMN) is a recently proposed entity characterized by a papillary-cystic proliferation of mucin-producing cells. Because of overlapping histologic features and a clonal AKT1 p.E17K variant, SG IPMN has been presumed to be a precursor or a low-grade subtype of mucinous adenocarcinoma. NKX3.1 is a tumor suppressor gene located on chromosome 8p and is a known immunohistochemical marker of prostate epithelium and mucinous acinar cells of the intraoral salivary glands.
Methods
We retrieved 12 SG IPMN cases, and performed histologic and genetic analysis. Given the association of SG IPMN with mucinous acinar cells, we also investigated the performance of NKX3.1 as a marker of this tumor entity.
Results
Diffuse and strong NKX3.1 expression was observed in all SG IPMN cases (12/12, 100%) as well as in normal mucinous acinar cells. In contrast, mucoepidermoid carcinoma and pancreatic IPMN cases as well as normal serous acinar cells were negative for NKX3.1. Genetically, 11 of 12 cases (92%) harbored an AKT1 p.E17K variant. A novel PTEN frameshift deletion (p.G36Dfs*18) was detected in the other single case. At least one of the histologic features implying malignant tumors, such as severe cellular atypia, brisk mitotic activity, high Ki-67 proliferating index, lymphovascular invasion, and lymph node metastasis, was detected in 6 SG IPMN cases (50%).
Conclusion
The findings suggest that SG IPMN is a low-grade subtype of mucinous adenocarcinoma which may be derived from mucinous acinar cells of the minor salivary gland.
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Data Availability
The data that support the findings of this study are available from the corresponding author, MN, upon reasonable request.
Code Availability
Not applicable.
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This study was funded by NIH/NHS 1P01CA240239-01 (WCF, PMS).
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MN, PMS, and WCF contributed to the study conception and design. Material preparation, data collection and analysis were performed by MN, PMS, RH, KK, TT, MU, TN, and WCF. The first draft of the manuscript was written by MN, PMS, and WCF. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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The present study was approved by the Institutional Review Board (IRB) of each collaborating institution (Mass General Brigham IRB 2015P001749, Nagoya University IRB 2018–019014195).
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Nakaguro, M., Sadow, P.M., Hu, R. et al. NKX3.1 Expression in Salivary Gland “Intraductal” Papillary Mucinous Neoplasm: A Low-Grade Subtype of Salivary Gland Mucinous Adenocarcinoma. Head and Neck Pathol 16, 1114–1123 (2022). https://doi.org/10.1007/s12105-022-01471-4
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DOI: https://doi.org/10.1007/s12105-022-01471-4