Epidermal growth factor receptor immunoexpression evaluation in malignant salivary gland tumours.

OBJECTIVE: The aim of this study was to determine epidermal growth factor receptor (EGFR) expression in malignant salivary gland tumours and its possible relationships with clinical and morphological findings, disease course and prognosis. PATIENTS AND METHODS: The study sample comprised 88 patients diagnosed and treated for primary malignant salivary gland tumours between January 1992 and December 2002. We analysed EGFR expression using immunohistochemistry on formalin-fixed, paraffin embedded surgical specimens of all patients. Statistical analysis was used to investigate possible relationships between EGFR expression and clinical findings, histological findings, disease course and patients survival.
RESULTS: Of all cases, 32 (36.4%) were EGFR positive. There was a statistically significant correlation between EGFR expression and histological grade. No other variable was correlated with EGFR expression including the overall and disease-free survival. Stage classification was the only parameter in multivariate analysis that was an independent predictor of low overall and disease-free survival.
CONCLUSION: EGFR is not a useful indicator of prognosis in malignant salivary gland tumours. However, the EGFR expression in salivary gland cancers like adenocarcinomas, undifferentiated carcinomas, mucoepidermoid carcinomas or salivary duct carcinomas suggests that these tumours may be a candidate for therapy investigation directed at EGFR.