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Published on: January 3, 2013
Immunohistochemical expression of 14-3-3 sigma protein in intraductal papillary-mucinous tumor and invasive ductal
Toshiyuki Okada1, Norihiro Masuda, Yasuyuki Fukai
1Departments of General Surgical Science, Gunma University Graduate School of Medicine, 3-39-22, Showa-machi, Maebashi, Gunma, Japan.
Background:
14-3-3 sigma (sigma) has been shown to be overexpressed in pancreatic cancers by a c-DNA microarray technique. However, the expression of 14-3-3 sigma in intraductal papillary-mucinous tumor (IPMT) of the pancreas remains unclear.
Materials And Methods:
To evaluate the biological importance of 14-3-3 sigma expression in pancreatic carcinogenesis, immunohistochemistry for 14-3-3 sigma, CDX2, MUC1, MUC2, p53, p16 and Ki-67 was carried out on 33 IPMTs and the results were compared with those for 14 invasive ductal carcinomas (IDCs).
Results:
The frequency of 14-3-3 sigma immunoreactivity was 70% and 100% in IPMT and IDC, respectively. The frequency of MUCI and Ki-67 immunoreactivity was significantly higher in IDC than IPMT. In IPMT, dark columnar cell types prevailed over clear columnar cell types in terms of the frequency of the Ki-67 labeling index.
Conclusion:
The overexpression of 14-3-3 sigma was confirmed in both IDC and IPMT. Therefore, this overexpression might occur in the early stages of pancreatic carcinogenesis. Moreover, IPMT composed of dark columnar cells might be a potentially more advanced form than that made up of clear columnar cells.
