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Apoptosis and expression of the proto-oncogenesbcl-2 and p53 and the proliferation factor Ki-67 in human medullary thyroid carcinoma

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Abstract

Apoptosis and immunoreactivity forbcl-2, p53, and Ki-67 were studied in 21 patients with medullary thyroid carcinoma (MTC). The DNA nick end labeling method was used to assess apoptosis. The relationships between the different factors were analyzed, as were their relations to clinicopathological data, including survival. More than 80% of the tumors harbored apoptotic cells. Tumors in individuals who had died of the MTC disease had a higher percentage of apoptosis. All cases demonstrated immunoreactivity tobcl-2; disease-free individuals had a higher rate than those with recurrent disease. No obvious pattern could be discerned in the relation of p53 or Ki-67 to the outcome of the MTC disease. An inverse correlation betweenbcl-2 and apoptosis (r=−0.81;p<0.01) was demonstrated.bcl-2 was significantly (p=0.014) associated with apoptosis even after taking both p53 and Ki-67 into consideration, but these two factors were unrelated to apoptosis. None of the factors studied were correlated to crude survival, either in univariate or in multivariate analyses. This study established thatbcl-2 immunoreactivity is closely associated with apoptosis in MTC, suggesting that a downregulation of thebcl-2 protein is related to a more aggressive growth rate and might be a useful marker for the evaluation of MTC.

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Wang, W., Johansson, H., Bergholm, U. et al. Apoptosis and expression of the proto-oncogenesbcl-2 and p53 and the proliferation factor Ki-67 in human medullary thyroid carcinoma. Endocr Pathol 7, 37–45 (1996). https://doi.org/10.1007/BF02739913

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