Comparison of p63/p40 Expression With Myoepithelial Markers in Minor Salivary Gland Tumors.

Abstract

The present study aimed to compare the expression of p63/p40 with smooth muscle actin (SMA) and vimentin (VIM) by myoepithelial cells in minor salivary gland tumors. Fifty-two formalin-fixed paraffin-embedded samples of minor salivary gland tumors derived from intercalated duct (pleomorphic adenoma [PA], adenoid cystic carcinoma [ACC], epithelial-myoepithelial carcinoma [EMC], polymorphous adenocarcinoma [PAC], and secretory carcinoma [SC]) and 3 samples of minor salivary gland tumors derived from excretory duct (mucoepidermoid carcinoma [MEC]) were evaluated by means of immunohistochemistry. The data were analyzed qualitatively. The results indicated that p63 and p40 expression were detected in myoepithelial cells present in PA, ACC, and EMC. However, both proteins were also observed in squamous areas of PA and all cases of MEC. SMA were noticed in some myoepithelial cells of PA, ACC, and EMC. Expression of SMA was negative in the other salivary gland tumors evaluated. VIM was constantly expressed by myoepithelial cells in PA, ACC, and EMC. VIM was also observed in cells of PAC and SC, but not in squamous areas of PA and MEC. In conclusion, p63 expression is almost comparable with VIM in detecting myoepithelial cells, an immunolabeling pattern not followed by p40, and consequently, caution has to be taken during the interpretation of salivary gland tumor exhibiting an p63/p40 phenotype in order to avoid a misdiagnosis.

• Authors: Lucas Novaes Teixeira, Évelin Caroline Janner, Thaís Teixeira, Fabrício Passador-Santos, Elizabeth Ferreira Martinez, Ana Paula Dias Demasi, Ney Soares de Araújo, Vera Cavalcanti de Araújo
• Journal: International journal of surgical pathology (Int J Surg Pathol) Vol. 27 Issue 4 Pg. 360-371 (Jun 2019) ISSN: 1940-2465 [Electronic] United States
• PMID: 30482064 (Publication Type: Journal Article)

Chemical References

• ACTA2 protein, human
• Actins
• Biomarkers, Tumor
• TP63 protein, human
• Transcription Factors
• Tumor Suppressor Proteins
• VIM protein, human
• Vimentin

Topics

• Actins (analysis, metabolism)
• Adolescent
• Adult
• Aged
• Biomarkers, Tumor (analysis, metabolism)
• Carcinoma (diagnosis, pathology)
• Diagnosis, Differential
• Epithelial Cells (pathology)
• Female
• Humans
• Male
• Middle Aged
• Salivary Gland Neoplasms (diagnosis, pathology)
• Salivary Glands, Minor (cytology, pathology)
• Transcription Factors (analysis, metabolism)
• Tumor Suppressor Proteins (analysis, metabolism)
• Vimentin (analysis, metabolism)
• Young Adult