GENETIC-CHARACTERIZATION OF HHV-8 KSHV-POSITIVE PRIMARY EFFUSION LYMPHOMA REVEALS FREQUENT MUTATIONS OF BCL6 - IMPLICATIONS FOR DISEASE PATHOGENESIS AND HISTOGENESIS/

Human herpesvirus-8/Kaposi sarcoma-associated herpesvirus-positive pri mary effusion lymphoma (PEL) is a recently identified B-cell non-Hodgk in lymphoma category characterized by liquid growth in the serous body cavities. Apart from viral infection, no genetic alteration is known to be associated with PEL and no recurrent cytogenetic abnormality has been identified in these lymphomas. Yet the consistent monoclonality of PEL indicates that the disease is not solely a virus-driven prolife ration. Here we report that PEL is associated with a high frequency of mutations of BCL6 5' noncoding regions, and we identify karyotypic ab normalities that may be recurrently involved in these lymphomas. Mutat ions of BCL-6 5' noncoding regions-occurred in 8/13 PEL. Mutations occ urred in the absence of BCL6 gross rearrangements were often multiple in the same patient (7/8 mutated cases), and occurred in both HIV-posi tive and HIV-negative individuals. Since BCL6 mutations are regarded a s a genetic marker of B-cell transition through the germinal center (G C), these data are consistent with histogenetic derivation of PEL from GC or post-GC B-cells. Cytogenetic and FISH analysis of seven PEL cel l lines showed frequent occurrence of complete or partial trisomy 12 ( 7/7 cases), trisomy 7 (4/7 cases), and abnormalities of bands 1q21-25 (5/7 cases). Genes Chromosomes Cancer 24:16-23, 1999. (C) 1999 Wiley-L iss, Inc.