Epidermal growth factor receptor and human epidermal growth receptor 2 expression in parotid mucoepidermoid carcinoma: possible implications for targeted therapy.

Abstract

The expression of epidermal growth factor receptor (EGFR) and human epidermal growth factor receptor 2 (HER2) was analyzed in immunohistochemical preparations from 46 primary parotid mucoepidermoid carcinomas (MEC). For the cases with lymph node metastases, the receptor expressions were investigated in parallel samples, primary tumour and metastasis, from each patient (n=11). The goal was to evaluate whether any of these receptors are suitable as a target for radionuclide-based imaging and therapy. The HercepTest scoring was used for the analysis of both HER2 and EGFR expression (0, 1+, 2+ or 3+). EGFR overexpression (2+/3+) was found in 67.4% (31/46) of the primary tumours. Out of the 11 cases with evaluated paired samples, EGFR overexpression was observed in 81.8% (9/11) of the primary tumours and 72.7% (8/11) of the corresponding lymph node metastases. There was only one patient who had EGFR overexpression in the primary tumours which changed to negative in the lymph node metastases but no changes occurred reciprocally. The HER2 overexpression was only found in 4.3% (2/46) of the primary mucoepidermoid carcinoma and none of the lymph node metastases (0/11). EGFR and HER2 stainings were mainly found in the cell membranes. It was concluded that the majority of parotid mucoepidermoid carcinomas express EGFR strongly in their cell membranes and that lymph node metastases generally express EGFR to approximately the same extent as in the primary tumours. The stability in the EGFR expression is encouraging in the effort to develop radionuclide-based EGFR imaging agents. It is also possible that EGFR targeting agents (e.g. Iressa, Tarceva, Erbitux or radiolabelled antibodies) can be applied for the therapy of mucoepidermoid carcinoma.

• Authors: Jinbiao Shang, Yongjie Shui, Liming Sheng, Kejing Wang, Qiongge Hu, Qichun Wei
• Journal: Oncology reports (Oncol Rep) Vol. 19 Issue 2 Pg. 435-40 (Feb 2008) ISSN: 1021-335X [Print] Greece
• PMID: 18202792 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antineoplastic Agents
• Protein Kinase Inhibitors
• ErbB Receptors
• Receptor, ErbB-2

Topics

• Adult
• Antineoplastic Agents (pharmacology, therapeutic use)
• Carcinoma, Mucoepidermoid (drug therapy, enzymology, pathology)
• ErbB Receptors (analysis, drug effects, metabolism)
• Female
• Humans
• Male
• Parotid Neoplasms (drug therapy, enzymology, pathology)
• Protein Kinase Inhibitors (pharmacology, therapeutic use)
• Receptor, ErbB-2 (analysis, drug effects, metabolism)