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The Korean Journal of Pathology 2001;35(4): 286-290.
Caspase 3 and Ki-67 Immunoreactivity and Its Correlation with Frequency of Apoptosis in Gastric Adenomas and Carcinomas.
Jin Hee Sohn, Seoung Wan Chae, Kyung Chan Choi, Hyung Sik Shin
Department of Pathology, Hallym University, College of Medicine, Seoul 150-020, Korea. jhsohn@www.hallym.or.kr
BACKGROUND: Apoptosis, also known as programmed cell death, is under genetic control and is mediated by apoptosis-specific genes, certain oncogenes and tumor suppressor genes. Caspase 3, a group of cystein proteases, is involved in the induction of apoptosis and has been considered to be correlated with apoptosis. Therefore, we tried to define whether caspase 3 is expressed in gastric adenoma and carcinoma, and correlated with apoptosis. METHODS: The apoptotic index and caspase 3 and Ki-67 immunoreactivity were observed in 25 gastric adenomas, 31 early gastric carcinomas (EGC) and 64 advanced gastric carcinomas (AGC) by in situ labelling and immunohistochemistry. RESULTS: The mean number of apoptotic bodies and caspase 3 immunoreactivity were significantly increased from adenoma through EGC to AGC. Ki-67 immunoreactivity was more increased in AGC than in adenoma and EGC. And the number of apoptotic bodies were positively correlated with caspase 3 and Ki-67 immunoreactivity, and caspase 3 immunoreactivity was negatively correlated with Ki-67 immunoreactivity even though they were statistically insignificant. CONCLUSIONS: Our results suggest that caspase 3 activation is important for inducing apoptosis, and both caspase 3 and apoptosis are increased along the tumor progression.
Key Words: Apoptosis; Caspases; Ki-67 antigen; Carcinoma; Stomach