title: T(14;18)(q32;q21) involving IGH and MALT1 is a frequent chromosomal aberration in MALT lymphoma.
abstract: T(11;18)(q21;q21) is the most common structural abnormality in extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) leading to the fusion of the apoptosis inhibitor-2 (API2) gene and the MALT lymphoma-associated translocation (MALT1) gene. In 2 patients with MALT lymphoma of the liver and skin, respectively, t(14;18)(q32;q21) was observed by cytogenetic analysis. Subsequent fluorescence in situ hybridization (FISH) studies disclosed that the immunoglobulin heavy-chain locus (IGH) and the MALT1 gene were rearranged by this translocation. In order to screen a large series of MALT lymphomas for this aberration, a 2-color interphase FISH assay was established. Among a total of 66 cases, t(14;18)(q32;q21) involving IGH and MALT1 was detected in MALT lymphomas of the liver (4 of 4), skin (3 of 11), ocular adnexa (3 of 8), and salivary gland (2 of 11), but did not occur in MALT lymphomas of the stomach (n = 10), intestine (n = 9), lung (n = 7), thyroid (n = 4), or breast (n = 2). In total, 12 of 66 (18%) MALT lymphomas harbored t(14;18)(q32;q21); 7 additional cases of splenic marginal zone lymphoma tested negative. All of the 12 MALT lymphomas featuring the t(14;18)(q32;q21) were negative for t(11;18)(q21;q21) by reverse transcriptase-polymerase chain reaction (RT-PCR). However, trisomy 3 and/or 18 was found in 4 of 12 cases, suggesting that the t(14;18)(q32;q21) does not occur as the sole genetic abnormality. This study identifies IGH as a new translocation partner of MALT1 in MALT lymphomas, which tend to arise frequently at sites other than the gastrointestinal tract and lung. In contrast to t(11;18)(q21;q21)(+) MALT lymphomas, those with t(14;18)(q32;q21) may harbor additional genetic abnormalities.
authors.affiliation: Department of Pathology, Division of Oncology, Vienna General Hospital, University of Vienna, Vienna, Austria.
authors.forename: Berthold
authors.initials: B
authors.lastname: Streubel
authors.forename: Andrea
authors.initials: A
authors.lastname: Lamprecht
authors.forename: Judith
authors.initials: J
authors.lastname: Dierlamm
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Cerroni
authors.forename: Manfred
authors.initials: M
authors.lastname: Stolte
authors.forename: German
authors.initials: G
authors.lastname: Ott
authors.forename: Markus
authors.initials: M
authors.lastname: Raderer
authors.forename: Andreas
authors.initials: A
authors.lastname: Chott
mesh_terms: D020169:Caspases; D002880:Chromosomes, Human, Pair 11; D002883:Chromosomes, Human, Pair 14; D002887:Chromosomes, Human, Pair 18; D002893:Chromosomes, Human, Pair 3; D005134:Eye Neoplasms / Q000235:genetics; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D017404:In Situ Hybridization, Fluorescence; D008113:Liver Neoplasms / Q000235:genetics; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics*; D000074884:Mucosa-Associated Lymphoid Tissue Lymphoma Translocation 1 Protein; D009363:Neoplasm Proteins / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012468:Salivary Gland Neoplasms / Q000235:genetics; D012878:Skin Neoplasms / Q000235:genetics; D014178:Translocation, Genetic; D014314:Trisomy
chemical_list: D007143:Immunoglobulin Heavy Chains; D009363:Neoplasm Proteins; D020169:Caspases; C400109:MALT1 protein, human; D000074884:Mucosa-Associated Lymphoid Tissue Lymphoma Translocation 1 Protein