Objective To investigate the effect of methylation of the APC gene on expression and the correlation with clinical data in pancreatic cancer.Methods Sixty postoperative tissue samples with pancreatic cancer were collected in the First Affiliated Hospital of Zhengzhou University from August 2010 to January 2011,20 benign pancreatic disease tissues were collected as control groups.APC promoter methylation and gene expression levels were detected by Methylation Specific PCR (MSP),Real Time PCR (RT-PCR) and Western blot in 60 pancreatic carcinoma,42 metastasis and 20 benign pancreatic disease tissues,then analyze the relation between methylation of the APC gene and the clinical data.Results APC promoter methlation was observed 48.53％,46.67％ and 1.16％ in pancreatic carcinoma,metastasis and benign pancreatic disease tissue,respectively.Methylation of APC in pancreatic carcinoma and metastasis increased significantly compared with control tissues (x2 =12.903,14.402; P ＜ 0.05).There were no statistically significant differences of APC expression in these tissues (P ＞ 0.05).There was a significant correlation between methylation of APC and clinicopathological stage (x2 =6.801,P ＜ 0.05),but no correlation with gender,age,tumor size,histological grade and metastasis (x2 =0.727,1.311,0.372,0.148,0.017 ; P ＞ 0.05).Conclusion The methylation of APC gene is closely related with pancreatic carcinoma inogenesis and the clinicopathological stage,but do not effect the expression of APC in tissues.

In this study,we investigated the genes related to the transformation of immortalized human fetal tracheal fibroblast cell line induced by alpha particles by means of differential display Mrna method.The result revealed that there were 23 DNA fragments that were expressed intensively in Αshtf cells(SHTF cells forming clone on agar after irradiated by α particles emitted by 238 Pu)only and not in SHTF(SV40-immortalized human fetal tracheal fibroblast)cells.Northern dot confirmed two fragments,C17-5,C23-1 which showed intensive Mrna expression in Αshtf cells,but not in SHTF cells.The length of the C17-5 fragment was 310bp.Searching in BLAST database revealed that the C17-5 fragment might be an unknown sequence.