GI, Liver & Pancreas Pathology
Shilpa Tukaram Patil; Clement Wilfred Devadass; Prasanna Shetty Badila
Abstract
Background & Objective: Colorectal cancer is the third most prevalent malignancy with high mortality rate, necessitating markers that predict survival and guide the treatment. Previous studies have examined the immunohistochemical expression of Bcl-2, an apoptotic marker, in colorectal carcinoma, ...
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Background & Objective: Colorectal cancer is the third most prevalent malignancy with high mortality rate, necessitating markers that predict survival and guide the treatment. Previous studies have examined the immunohistochemical expression of Bcl-2, an apoptotic marker, in colorectal carcinoma, but results have been contradictory. To evaluate the histopathological features of colorectal carcinoma, immunohistochemical expression of Bcl-2 must be analyzed to find out statistical association of Bcl-2 expression with certain prognostic factors histopathologic type, grade and TNM staging. Methods: This prospective study was conducted on the colectomy specimens of colorectal carcinoma, over a period of two years. The tumor morphology and Bcl-2 status were evaluated by immunohistochemistry in each case. Result: The study included 58 cases, with mean patient age of 47.07 years and male: female ratio of 1.89:1. Bcl-2 positivity was seen in 32.7% of the cases. Weak, moderate, and strong expression of Bcl-2 was seen in 12.1%, 12.1%, and 8.5% of cases respectively. Even though early stages of colorectal carcinoma showed greater frequency of Bcl-2 expression than advanced stages (36.3% versus 28%), however this association was not statistically significant. Conclusion: Lack of statistically significant correlation between Bcl-2 immuno-histochemical expression and prognostic parameters like tumor grade and stage, suggests that Bcl-2 immunoexpression may not be a significant prognostic marker in colorectal carcinoma.
Ban Qasim; Husam Ali; Alaa Hussein
Volume 7, Issue 4 , September 2012, , Pages 215-223
Abstract
Background & Objective: The current approaches to reduce the risk of colorectal carcinoma are through the detection and removal of the precursor lesion” adenomatous polyps”. The study was conducted to evaluate the immunohistochemical expression of p53 and bcl2 in colorectal adenomas and ...
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Background & Objective: The current approaches to reduce the risk of colorectal carcinoma are through the detection and removal of the precursor lesion” adenomatous polyps”. The study was conducted to evaluate the immunohistochemical expression of p53 and bcl2 in colorectal adenomas and carcinomas.
Patients and Methods: A total of 86 cases, 33 colorectal adenomas, 33 colorectal adenocarcinomas and 20 samples of non -tumerous colonic tissue as control, were included in this retrospective study. Sections were stained immunohistochemically for p53 and bcl2. Scoring was performed using Digimizer software. Data were analyzed using SPSS program (Statistical Package for Social Sciences) version 16 and Microsoft Office Excel 2007.
Results: The frequency of p53 positive cases was significantly higher in carcinoma than adenoma while the frequency of bcl2 positive cases was significantly higher in adenoma than carcinoma. P53 expression was significantly higher in large sized adenomas, villous configuration, severe dysplasia, and multiple lesions. Bcl2 expression showed significantly correlated with adenomas of small size, solitary, tubular, and mild dysplasia. There was a significant correlation between bcl2 expression and non-mucinous carcinoma and a negative correlation with tumor size.Therewas an inverse relationship between bcl2 and p53 expression in both colorectal adenomas and carcinomas.
