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- W2034218185 abstract "We investigated the frequency of bcl-2 protein overexpression in 80 diffuse large B-cell lymphoma (DLBCL) patients using both Western blotting and immunohistochemistry (IHC). Fifty-nine percent of the DLBCLs overexpressed bcl-2 protein by Western blot and 52% by IHC. The two methods usually gave concordant results (p = 0.005), but 14 (21%) out of the 67 cases that were analyzed by both methods were positive by Western blot and negative by IHC, and 8 (12%) cases vice versa. Bcl-2 overexpression by IHC was associated with poor response to chemotherapy and poor survival, whereas these associations were not found when bcl-2 overexpression was determined by Western blotting. The molecular mechanisms leading to bcl-2 overexpression were evaluated by PCR, karyotype analysis, and comparative genomic hybridization (CGH). When studied by PCR and/or karyotype analysis, 12 (15%) of the 80 cases had translocation (14;18)(q32;q21). All 12 lymphomas with (14;18)(q32;q21) translocation had bcl-2 overexpression by Western blot as compared with 35 (51%) of the 68 lymphomas without translocation (p = 0.001). Ten (29%) out of 34 cases that were analyzed by CGH showed amplification of chromosome 18 in which the BCL2 gene is located, and all cases showed bcl-2 overexpression by both Western blot and IHC. The results suggest that gene amplification and translocation are at least equally common mechanisms causing bcl-2 protein overexpression in DLBCL. Bcl-2 protein overexpression as determined by IHC is associated with poor response to chemotherapy and poor survival." @default.
- W2034218185 created "2016-06-24" @default.
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- W2034218185 date "2001-01-01" @default.
- W2034218185 modified "2023-10-14" @default.
- W2034218185 title "Causes and Consequences of<i>BCL2</i>Overexpression in Diffuse Large B-Cell Lymphoma" @default.
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- W2034218185 doi "https://doi.org/10.3109/10428190109097729" @default.
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