The importance of immunohistochemical expression of EGFr in squamous cell carcinoma of the oral cavity treated with surgery and postoperative radiotherapy
- Department of Radiation Oncology, VU University Medical Center, Amsterdam (Netherlands)
- Department of Pathology, VU University Medical Center, Amsterdam (Netherlands)
- Department of Otolaryngology/Head and Neck Surgery, VU University Medical Center, Amsterdam (Netherlands)
- Department of Oral and Maxillofacial Surgery, VU University Medical Center, Amsterdam (Netherlands)
- Department of Radiation Oncology, VU University Medical Center, Amsterdam (Netherlands) and Department of Radiation Oncology, University Medical Center Groningen, Groningen (Netherlands)
Purpose: The aim of this study was to investigate the prognostic significance of epidermal growth factor (EGFr) expression in oral cavity squamous cell carcinoma (OCSCC) treated with curative surgery and postoperative radiotherapy. Methods and Materials: This retrospective study included 165 OCSCC patients. The expression of EGFr was assessed on paraffin-embedded tissue of the primary tumor by immunohistochemistry using a monoclonal antibody directed against EGFr. Intensity of the EGFr expression was scored by two authors blinded for the clinical outcome. Results: In the univariate analysis, locoregional control at 3 years (LRC) in the EGFr-negative cases was 69% compared with 77% in the EGFr-positive cases (p 0.22). In the multivariate analysis for local control, a significant interaction was found between EGFr and overall treatment time of radiation (OTT). After stratification for EGFr expression, the OTT was of no importance in the EGFr-negative cases, whereas a significant difference in LRC was found in the EGFr-positive cases, in which the LRC after 3 years was 69% and 94% in case of an OTT of 0-42 days and >42 days, respectively (p = 0.009; hazard ratio = 3.42; 95% confidence interval, 1.28-8.96). No significant association was found between EGFr expression and overall survival. Conclusions: In the present study, no association was found between EGFr expression and outcome regarding locoregional control and overall survival. However, the results of the present study suggest that patients with squamous cell carcinoma of the oral cavity with high EGFr expression benefit more from a reduction of the overall treatment time of postoperative radiation than those with low EGFr expression.
- OSTI ID:
- 20850010
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 65, Issue 5; Other Information: DOI: 10.1016/j.ijrobp.2006.03.011; PII: S0360-3016(06)00420-2; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0360-3016
- Country of Publication:
- United States
- Language:
- English
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