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The Korean Journal of Pathology 2000;34(2): 132-137.
Expression of p27Kip1 Protein in Colorectal Adenocarcinoma.
Hyang Im Lee, Duck Hwan Kim, Eun Sook Nam, Hye Rim Park, Seoung Wan Chae, Chul Jae Park, Jeong Rye Kim, Hyung Sik Shin
1Departments of Pathology, College of Medicine, Hallym University, Seoul 134-701, Korea.
2Departments of General Surgery, College of Medicine, Hallym University, Seoul 134-701, Korea.
3Department of Pathology, Korea Veterans Hospital.
ABSTRACT
p27Kip1 has been recognized as a negative regulator of cell cycle. Reduced level of p27 expression is associated with development and aggressiveness of several human tumors. To investigate the role of p27Kip1 on progression of colorectal adenocarcinoma, we studied 40 cases of human colorectal adenocarcinomas for expression of p27Kip1 protein using an immunohistochemical method, and compared these results with known prognostic parameters of colorectal adenocarcinoma. Among 40 cases of colorectal adenocarcinomas, p27Kip1 expression was detected in the nuclei of tumor cells in 14 cases (35%). The expression rate of p27Kip1 protein was significantly lower in the cases with lymph node metastasis (25.8%) than in those without lymph node metastasis (66.6%) (p<0.05). But it did not correlate with other parameters such as tumor size, histologic grade, vascular invasion, and Ki-67 labeling index. The results suggest that reduced expression of p27Kip1 protein plays a role in biologically aggressive behavior of colorectal adenocarcinoma.
Key Words: Colorectal adenocarcinoma; p27kip1; Prognosis