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p53 and BCL-2 over-expression inversely correlates with histological differentiation in occupational ethmoidal
1Department of Otorhinolaryngology, Marche Polytechnic University, Ancona, Italy.
Abstract:
Despite their histological resemblance to colorectal adenocarcinoma, there is little information on the molecular events involved in the pathogenesis of intestinal-type sinonasal adenocarcinoma (ITACs). The aim of this paper is to evaluate the possible role of TP53 and Bcl-2 gene defects in ITAC by investigating the immunohistochemical expression of TP53 and Bcl-2 gene products in a group of ethmoidal ITACs associated with occupational exposure. A retrospective study on 15 patients with pathological diagnosis of primary ethmoidal ITAC was conducted. Representative formalin-fixed, paraffin wax-embedded block from each case was selected for immunohistochemical studies using the antibodies against p53 and Bcl-2. Clinical-pathological data were also correlated with the staining results. The results of immunohistochemical examination demonstrated that poorly differentiated cases showed a higher percentage of p53 and Bcl-2 expressing cells in comparison to well-differentiated cases. No correlation was found with other clinico-pathological parameters, including T, stage and relapses. The relationship between up-regulation of p53 and Bcl-2 and poorly differentiated ethmoidal adenocarcinoma suggests a role of these genes, in combination with additional genetic events, in the pathogenesis of ITAC.
Insights
TP53 and Bcl-2 gene expression is higher in poorly differentiated intestinal-type sinonasal adenocarcinoma (ITAC). This suggests a role for these genes in ITAC pathogenesis, particularly in occupational exposure cases.
Area of Science:
- Oncology
- Molecular Pathology
- Genetics
Background:
- Intestinal-type sinonasal adenocarcinoma (ITAC) shares histological similarities with colorectal adenocarcinoma.
- Limited data exists on the molecular mechanisms driving ITAC development.
- Occupational exposures are implicated in some ITAC cases.
Purpose of the Study:
- To investigate the potential role of TP53 and Bcl-2 gene alterations in ITAC pathogenesis.
- To examine the immunohistochemical expression of p53 and Bcl-2 in ethmoidal ITACs.
- To correlate gene expression with clinical and pathological features.
Main Methods:
- Retrospective study of 15 ethmoidal ITAC cases.
- Immunohistochemistry using antibodies against p53 and Bcl-2 on formalin-fixed, paraffin-embedded tissue.
- Correlation of staining results with clinical-pathological data.
Main Results:
- Poorly differentiated ITAC cases exhibited higher percentages of p53 and Bcl-2 expressing cells compared to well-differentiated cases.
- No significant correlation was observed between p53/Bcl-2 expression and other parameters like tumor stage or relapses.
- Up-regulation of p53 and Bcl-2 was noted in relation to poor differentiation.
Conclusions:
- The up-regulation of p53 and Bcl-2 in poorly differentiated ITAC suggests their involvement in the disease's molecular pathogenesis.
- These genetic alterations may act in concert with other genetic events in ITAC development.
- Further research is warranted to elucidate the complete molecular landscape of ITAC.
