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Apoptosis and Proliferative Activity of Non-Hodgkin's Lymphoma : Correlation with Bcl-2 and P53 Protein Expression  

Oh, Yoon-Kyeong (Department of Therapeutic Radiology, Chosun University Hospital)
Lee, Mi-Ja (Department of Pathology, Chosun University Hospital)
Jeon, Ho-Jong (Department of Pathology, Chosun University Hospital)
Publication Information
Radiation Oncology Journal / v.20, no.1, 2002 , pp. 73-80 More about this Journal
Abstract
Purpose : Tumor growth in a given neoplasm is the net result of cell proliferation and cell loss, and apoptosis is the most significant component of continuous cell loss in most tumors. In this study, we examined non-Hodgkin's lymphoma (NHL, n=67) immunohistochemically for the presence of Bcl-2 oncoprotein and P53 protein and compared apoptotic indices (Als) and Ki-67 proliferative indices (percentages of Ki-67 positive cells). Materials and Methods : 67 patients with NHL were evaluated : 3 low-grade and 64 intermediate-grade. The phenotype was determined in 65 cases : 47 $(70\%)$ were B cell type and 18 $(27\%)$ were T ceil type. Als and Ki-67 proliferative indices were determined immunohistochemically and the overexpression of P53 and Bcl-2 protein were also evalutated. Results : The overexpressions of Bcl-2 protein and P53 protein were found in $40\%$ (26/65) and $31\%$ (20/65). The Al ranged from $0\%\;to\;15\%$ (mean 2.16, median 1.2). Cellular Bcl-2, which counteracts apoptosis, was significantly (p=0.005) associated with Als. Ki-67 proliferative indices ranged from $1\%\;to\;91\%$ (mean 55.4), and P53 was significantly (p=0.000) associated with Ki-67 proliferative indices. A positive correlation between Als and Ki-67 proliferative indices was revealed (p=0.012) in Bcl-2 positive patients. Conclusion : In NHL, we observed a correlation between Als and Bcl-2 expression, between Ki-67 proliferative indices and P53 expression, and between Als and Ki-67 proliferative indices in Bcl-2 positive patients. Our results suggest that cell apoptosis may be inseparable from cell proliferation during tumor growth.
Keywords
Non-Hodgkin's lymphoma; Apoptotic index; Ki-67 proliferative index; BCl-2; P53;
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