Effects of Gefitinib on Expression of Epidermal Growth Factor Receptor in Bile Duct Epithelial Cells and Its Significance

Objective To observe the effect of gefitinib on expression of epidermal growth factor receptor(EGFR) in bile duct epithelial cells,and the feasibility of inhibiting hyperplasia of bile duct epithelial cells with gefitinib.Methods Sixty-one patients with hepatolithiasis having to be in hospital for surgery from the First People's Hospital of Shuangliu county were selected,with 25-65 years old,average 46.92 years.The patients were randomly divided into therapy group and control group.There were 30 cases in therapy group,in which fine duct was placed on lesion bile duct during operation,and through whom gefitinib solution was perfused after operation.There were 31 cases in control group with only T tube drainage after operation.The bile duct sample was obtained respectively during the operation and 6 weeks and 12 weeks after operation.The histology and expression change of EGFR were observed by HE staining,immunohistochemistry and RT-PCR method respectively.Results There were no significant differences in pathohistology changes of bile duct and the EGFR protein and mRNA expression between therapy group and control group during operation.The hyperplasia of epithelium mucosae and submucosal gland in the therapy group were obviously decreased as compared with those in control group,the EGFR mRNA and protein expression in therapy group were weaker than those of control group(P0.05) 6 weeks and 12 weeks after gefitinib treatment.Conclusion EGFR is overexpressed in the chronic proliferative cholangitis,and continuously local application of gefitinib after operation can specifically interrupt the activation and expression of EFGR and then effectively inhibit the hyperplasia of bile duct epithelial cells.