Increased MIB-1 expression in salivary gland pleomorphic adenoma that recurs and undergoes malignant transformation

The objective of this retrospective study was to explore possible changes in histopathological features and expression of cyclin D1 and MIB-1 in salivary gland pleomorphic adenoma (PA) that recur or undergo malignant transformation. Knowledge of these characteristics might help to guide the manageme...

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Bibliographic Details
Published in:	Scientific reports 2022-05, Vol.12 (1), p.9029-9029, Article 9029
Main Authors:	Markkanen, Anttoni, Aro, Katri, Laury, Anna Ray, Mäkitie, Antti A, Haglund, Caj, Atula, Timo, Hagström, Jaana
Format:	Article
Language:	eng
Subjects:	2-Methylisoborneol Adenoma Adenoma, Pleomorphic - metabolism Adenoma, Pleomorphic - pathology Cell Transformation, Neoplastic - metabolism Cyclin D1 Exocrine glands Humans Medicin och hälsovetenskap Metaplasia Retrospective Studies Salivary gland Salivary Gland Neoplasms Salivary Glands - metabolism Statistical analysis Transformation Tumors Ubiquitin-Protein Ligases
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Summary:	The objective of this retrospective study was to explore possible changes in histopathological features and expression of cyclin D1 and MIB-1 in salivary gland pleomorphic adenoma (PA) that recur or undergo malignant transformation. Knowledge of these characteristics might help to guide the management of these rare tumors. The histopathology and immunohistochemical staining characteristics of such tumors were analyzed in a cohort of 65 patients constituting three different groups of tumors: PA, recurrent pleomorphic adenoma (RPA) and carcinoma ex PA (CxPA). The RPAs were divided into two subgroups: primary PA that were known to recur later (PA-prim) and recurrent tumors appearing after a primary tumor (PA-rec). RPAs and CxPAs were compared with PAs without recurrence, which served as a control group. In our study, CxPA and PA-rec, but not PA-prim, showed increased MIB-1 expression compared with the control group. Neither cyclin D1 expression nor any histopathological features showed any association in statistical analyses. CxPA showed increased mitotic activity, squamous metaplasia, and nuclear atypia. Tumor multifocality was more frequent in PA-rec and CxPA. The different MIB-1 expression in CxPA and PA-rec in comparison to PA-prim suggests that the changes in expression could develop after the primary tumor.
ISSN:	2045-2322 2045-2322