Aim:To assess the changes and possible role of expression of EGFR in maxillary sinus carcinogenesis.Methods:Immunohistochemical LSAB.Results:The positivity rates of EGFR in maxillary sinus dysplasia and squamous cell carcinoma of the epithelia were significantly higher than those in normal and simple hyperplastic epithelia,and that of EGFR in squamous cell carcinoma was significantly higher than that in dysplasic epithelia ( P <0 05).The expressions of EGFR did not correlate with sex,age,and histologic g...