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[Clinicopathological and molecular characteristics of microsecretory adenocarcinoma in salivary gland]. | LitMetric

[Clinicopathological and molecular characteristics of microsecretory adenocarcinoma in salivary gland].

Zhonghua Bing Li Xue Za Zhi

Department of Oral Pathology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai 200011, China.

Published: October 2024

AI Article Synopsis

Article Abstract

To investigate the clinicopathological, immunohistochemical, and molecular genetic characteristics of microsecretory adenocarcinoma (MSA) of the salivary gland, and to improve the understanding of this rare tumor. Cases originally diagnosed as MSA at the Department of Oral Pathology, the Ninth People's Hospital of Shanghai Jiao Tong University School of Medicine were retrospectively collected. The cases of polymorphous adenocarcinoma and adenocarcinoma, not otherwise specified from January 2000 to January 2020 were reviewed to identify potential misdiagnosed MSA cases. Clinicopathological analysis and follow-up of all confirmed MSA cases were performed, and relevant literature was reviewed. A total of 4 MSA cases were identified, including 2 screened from the polymorphous adenocarcinoma cohort. Of the 4 MSA patients, 3 were male and 1 was female, with an average age of 53 years (range, 37-67 years). Three cases occurred in the palate, and one in the buccal region. The clinical manifestation was usually a slow-growing painless mass. Tumors were generally small, with a maximum diameter ranging from 0.7 to 1.8 cm (average, 1.2 cm). Microscopically, the tumor was unencapsulated and showed an infiltrative growth pattern. The tumor cells appeared small in size and showed bland, cubic and flattened cytological features, forming microcystic lumens and glandular tubes. Significant basophilic secretions were seen in the lumens. Between the tumor nests there was fibro-myxoid stroma. Immunohistochemistry showed diffusely or partially positive staining for cytokeratin 7, S-100, SOX-10, p63 and vimentin and negative staining for p40, mammaglobin, and calponin. The proliferation index of Ki-67 was relatively low (1%-3%). Four MSA cases all harbored SS18 gene rearrangement as shown by fluorescence in situ hybridization (FISH), including 2 cases with MEF2C::SS18 fusion gene through RNA-targeted next generation sequencing. All 4 patients underwent surgical resection without any adjuvant treatments. Three patients were followed up for a period of 2 to 203 months. No tumor recurrence, metastasis, or disease-related death was found. Salivary gland MSA is a novel and rare low-grade carcinoma with unique and consistent histological morphology, immunophenotype, and molecular changes. Immunohistochemical staining and SS18 break apart FISH are useful for the diagnosis of the tumor with atypical morphology and high-grade transformation.

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Source
http://dx.doi.org/10.3760/cma.j.cn112151-20240402-00217DOI Listing

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