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Cancer Genet Cytogenet. 2010 Jul 15;200(2):170-4. doi: 10.1016/j.cancergencyto.2010.03.009.

Detection of a t(4;14)(p16;q32) in two cases of lymphoma showing both the immunophenotype of chronic lymphocytic leukemia.

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  • 1Interdisciplinary Clinic for Stem Cell Transplantation, University Cancer Center Hamburg, Martinistrasse 52, Hamburg, Germany.

Abstract

Reciprocal IGH/14q32 translocations are detectable in 55-70% of patients with plasma cell myeloma; e.g., the adverse t(4;14)(p16;q32) fusing the IGH and FGFR3 genes (immunoglobulin heavy chain/fibroblast growth factor receptor 3). In a minority of patients with B-lineage chronic lymphocytic leukemia (CLL), reciprocal IGH/14q32 translocations have been reported as well. We describe the occurrence of a t(4;14)(p16;q32) in two lymphoma patients showing the immunophenotype of B-CLL, which, to our knowledge, is the first report on such an association. The first patient, a 72-year-old female, showed mature lymphocyte infiltration of the bone marrow and marked splenomegaly. Immunophenotyping revealed aberrant CD5 expression and light-chain lambda restriction on mature B-lymphocytes corresponding to a B-CLL. Interphase fluorescence in situ hybridization (FISH) plus chromosome banding revealed a t(4;14)(p16;q32) in addition to an unbalanced der(16)t(8;16)(q23;p13) and a del(8)(p11). The second patient, a male of 65 years, showed marked peripheral leukocytosis. Immunophenotyping revealed the phenotype of CLL/PLL (chronic lymphocytic leukemia/prolymphocytic leukemia). Again, FISH together with karyotyping revealed a t(4;14)(p16;q32). These two cases with an t(4;14), but the immunophenotype of B-CLL, demonstrate the genetic variability of B-cell lymphomas and the potential of specific metaphase cultivation techniques using oligonucleotides to increase our insights in the genetic pathways of these heterogeneous disorders.

Copyright (c) 2010 Elsevier Inc. All rights reserved.

PMID:
20620602
[PubMed - indexed for MEDLINE]
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