ABSTRACT
To evaluate the immunohistochemical expression of matrix metalloproteinase-7 [MMP-7] in colorectal adenomas, and to correlate this expression with different clinicopathological parameters. The study was retrospectively designed. Thirty three paraffin blocks from patients with colorectal adenoma and 20 samples of non-tumerous colonic tissue taken as control group were included in the study. MMP-7 expression was assessed by immunohistochemistry method. The scoring of immunohistochemical staining was conducted utilizing a specified automated cellular image analysis system [Digimizer]. The frequency of positive immunohistochemical expression of MMP-7 was significantly higher in adenoma than control group [45.45% versus 10%] [P value < 0.001]. Strong MMP-7 staining was mainly seen in adenoma cases [30.30%] in comparison with control [0%] the difference is significant [P < 0.001]. The three digital parameters of MMP-7 immunohistochemical expression [Area [A], Number of objects [N], and intensity [I]] were significantly higher in adenoma than control. Mean [A and I] of MMP-7 showed a significant correlation with large sized adenoma [>/= 1cm] [P < 0.05], also a significant positive correlation of the three digital parameters [A, N, and I] of MMP-7 expression with villous configuration and severe dysplasia in colorectal adenoma had been identified [P < 0.05]. MMP-7 plays an important role in the growth and malignant conversion of colorectal adenomas as it is more likely to be expressed in advanced colorectal adenomatous polyps with large size, severe dysplasia and villous histology. The use of automated cellular image analysis system [Digmizer] to quantify immunohistochemical staining yields more consistent assay results, converts semi-quantitative assay to a truly quantitative assay, and improves assay objectivity and reproducibility
Subject(s)
Humans , Female , Male , Adenoma/ultrastructure , Immunohistochemistry , Adenoma/pathology , Matrix Metalloproteinase 7ABSTRACT
To evaluate the immunohistochemical expression of proliferating cell nuclear antigen [PCNA] and CD34 in colorectal adenomas and carcinomas, and to correlate this expression with different clinicopathologic parameters. The study was retrospectively designed. A total of 86 tissue samples, including 33 paraffin blocks from patients with colorectal adenomas, 33 paraffin blocks from patients with colorectal adenocarcinomas, and a control group of 20 samples of nontumerous colonic tissue, were included in the study. From each block, 3 sections of 5 micro m thickness were taken, 1 section was stained with hematoxylin and eosin [H and E] and the other 2 sections were stained immunohistochemically for PCNA and CD34. Scoring of the immunohistochemical staining was performed using a specified automated cellular image analysis system [Digimizer]. PCNA expression was significantly increased in a sequence of normal mucosa-adenoma-carcinoma. It was significantly higher in adenomas >/= 1 cm and those with severe dysplasia, and it showed a significant positive correlation with grade and lymph node involvement in colorectal carcinoma. CD34 showed significantly higher expression in carcinoma than adenoma and in adenoma than in the control group. CD34 expression showed a significant correlation with adenomas carrying severe dysplasia and large-sized adenomas [>/= 1cm]. It was significantly correlated with tumor grade, lymphovascular invasion, and lymph node involvement in colorectal carcinoma. PCNA plays an important role in colorectal neoplastic progression and can be utilized as ancillary marker for the risk of malignant transformation in colorectal adenomas as it correlates with high grade dysplasia and size. Intratumoral quantification of the mean [A and N] of CD34 in colorectal carcinoma reflects the grade of tumors and can predict lymph node involvement and lymphovascular invasion, to make a useful additional prognostic factor