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Diffuse large B cell lymphoma (DLBCL) and Burkitt lymphoma (BL) are mature agressive B cell lymphomas that have heterogeneous clinical, morphological, immunofenotypical and cytogenetic features, and have widely different clinical course. In this study, the immunohistochemical and cytogenetic features seen in DLBCL and BL and the association between the prognosis are studied. Also the characteristics that can be used to differentiate DLBCL and BL is defined. METHODS: Totally 56 cases (45 DLBCL and 11 BL), which were diagnosed in Gazi University, Medical School, Department of Pathology between 2000 and 2007 were included to study. Bcl-2, bcl-6, CD10, MUM-1 and Ki-67 antibodies were performed immunohistochemically and c-myc amplification, PTEN deletion and t(14;18) translocation was evaluated by fluorescent in situ hybridization. RESULTS: The expression of bcl-2, bcl-6 and CD 10 were 55.6%, 35.6% and 25.8% respectively in DLBCL cases. In the cases of BL, all the cases were bcl-2 negative, bcl-6 and CD 10 positive. While the proliferation index of Ki-67 were 63.2% in DLBCL, it was 97.2% in BL (p=0.001). The ratio of c-myc amplification was 80% in BL and 43.7% in DLBCL (p<0.05). The ratio of t(14;18) translocation and PTEN deletion was 7.7% and 26.7% in DLBCL, while it was 20% and 9.1% in BL (p>0.05).

acta oncologica turcica

The association of the coexpression of c-myc, PTEN and t (14;18) detected by fluorescent in situ hybridization with high proliferation index in diffuse large B cell lymphoma