title: The spectrum of B-cell non-Hodgkin lymphomas with dual IgH-BCL2 and BCL6 translocations.
abstract: Dual IgH/BCL2 and BCL6 translocations are rarely observed in B-cell non-Hodgkin lymphomas (B-NHLs). We investigated the morphologic, phenotypic, and cytogenetic spectrum of B-NHL with such dual translocations. Dual IgH/BCL2 and BCL6 translocations were detected in follicular lymphomas (FLs) and diffuse large B-cell lymphomas (DLBCLs), representing 6.1% of 132 B-NHLs in our series, including 6 (11%) of 56 FLs (grades 1, 2, and 3a) and 2 (3%) of 76 DLBCLs; 33% of FLs with dual translocations had variant morphologic features. All dual-translocation FLs were CD10+/BCL6+/BCL2+/MUM1-, and the DLBCLs demonstrated "activated" germinal center (CD10+/BCL6+/MUM1+) and non-germinal center (CD10-/BCL6+/MUM1+) phenotypes. BCL6 translocations in all cases involved nonimmunoglobulin genes/loci. Mean chromosome abnormalities in dual-translocation FLs and DLBCLs did not differ from IgH/BCL2 FLs and DLBCLs. Detection of dual translocations predominantly in low-grade FLs suggests that BCL6 abnormalities are acquired early in the histologic evolution of a subset of IgH/BCL2-associated FLs.
authors.affiliation: Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
authors.forename: Christian E
authors.initials: CE
authors.lastname: Keller
authors.forename: Subhadra
authors.initials: S
authors.lastname: Nandula
authors.forename: Julie
authors.initials: J
authors.lastname: Fisher
authors.forename: Shivakumar
authors.initials: S
authors.lastname: Subramaniyam
authors.forename: Efsevia
authors.initials: E
authors.lastname: Vakiani
authors.forename: David G
authors.initials: DG
authors.lastname: Savage
authors.forename: Vundavalli V
authors.initials: VV
authors.lastname: Murty
authors.forename: Bachir
authors.initials: B
authors.lastname: Alobeid
authors.forename: Govind
authors.initials: G
authors.lastname: Bhagat
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002883:Chromosomes, Human, Pair 14; D002887:Chromosomes, Human, Pair 18; D002893:Chromosomes, Human, Pair 3; D005260:Female; D005803:Genes, Immunoglobulin; D019254:Genes, bcl-2; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D016393:Lymphoma, B-Cell / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D051560:Proto-Oncogene Proteins c-bcl-6 / Q000235:genetics*; D014178:Translocation, Genetic
chemical_list: D007143:Immunoglobulin Heavy Chains; D051560:Proto-Oncogene Proteins c-bcl-6