Variable frequencies of MALT lymphoma-associated genetic aberrations in MALT lymphomas of different sites

Medical University of Graz, Gratz, Styria, Austria
Leukemia (Impact Factor: 10.43). 11/2004; 18(10):1722-6. DOI: 10.1038/sj.leu.2403501
Source: PubMed


Although several recurrent genetic aberrations are known to occur in MALT lymphoma, no comprehensive study on the most prevalent MALT lymphoma-associated genetic aberrations is available. We therefore screened 252 primary MALT lymphomas for translocations t(11;18)(q21;q21), t(14;18)(q32;q21), and t(1;14)(p22;q32), and trisomies 3 and 18. The above-listed translocations occurred mutually exclusively and were detected overall in 13.5, 10.8, and 1.6% of the cases; trisomy 3 and/or 18 occurred in 42.1%. The frequency at which the translocations occurred varied markedly with the primary site of disease. The t(11;18)(q21;q21) was mainly detected in pulmonary and gastric tumors, whereas the t(14;18)(q32;q21) was most commonly found in lesions of the ocular adnexa/orbit, skin, and salivary glands. Trisomies 3 and 18 each occurred most frequently in intestinal and salivary gland MALT lymphomas. Our results demonstrate that the three translocations and trisomies 3 and 18 occur at markedly variable frequencies in MALT lymphoma of different sites.

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Available from: Julius R Lukas, Aug 22, 2014
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    • "The other common chromosomal aberrations include t(1;14)(p22;q32), t(14;18)(q32;q21), and t(3;14)(p14.1;q32) involving BCL10, MALT1, and FOXP1, respectively [17–19]. The molecular genetic testing is helpful to differentiate this type of lymphoma from atypical marginal zone hyperplasia of mucosa-associated lymphoid tissue and immunoproliferative small intestinal disease (IPSID). "
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    ABSTRACT: Meckel diverticulum is the most common congenital defect of the gastrointestinal tract. It can be asymptomatic or mimic appendicitis and may be complicated by bleeding, diverticulitis, obstruction, and, rarely, neoplasia. We report the first case of extranodal marginal zone lymphoma occupying a Meckel diverticulum. A 44-year-old man with history of colonic diverticulitis presented to the emergency department for evaluation of acute abdominal pain. Radiography showed enteric obstruction, prompting diagnostic laparoscopy. Above the level of mid-ileum an intact Meckel diverticulum was identified. Microscopy showed extensive infiltration of sheets of small lymphocytes with abundant cytoplasm (monocytoid B-cells) prominently in submucosa and focally transmural involving serosal adipose tissue with multiple reactive germinal centers. The immunostains showed positivity for CD20, BCL-2, and CD43 (weak) and negativity for CD3, CD5, BCL-1, CD10, and BCL-6 in monocytoid B-cells. Fluorescence in situ hybridization studies revealed API2-MALT1 fusion signals consistent with t(11;18)(q21;q21), which confirmed the diagnosis of extranodal marginal zone lymphoma, also known as mucosa associated lymphoid tissue lymphoma.
    04/2014; 2014:374814. DOI:10.1155/2014/374814
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    • "In our case, a diagnosis was made using CT-guided lung biopsy. The histopathological characteristics of MALT lymphoma have been shown to include lymphoepithelial lesions, plasma cell differentiation, and Dutcher bodies, and trisomy 3 and t(11;18)(q21;q21) are also characteristic of chromosomal abnormalities [10, 11]. The API2-MALT1 fusion gene occurs by the translocation of two genes, identified as the API2 gene at 11q21 and MALT1 gene at 18q21, and translocation is particularly high at approximately 50% in pulmonary MALT lymphoma [11]. "
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    ABSTRACT: An 84-year-old woman was admitted to our hospital with nonproductive cough and dyspnea on exertion. Computed tomography (CT) scan revealed extensive consolidation in the right lung. She was diagnosed with pulmonary mucosa-associated lymphoid tissue (MALT) lymphoma using CT-guided lung biopsy. Her pulmonary images and respiratory symptoms did not improve two months after receiving 4 cycles of rituximab weekly; therefore, yttrium-90 ibritumomab tiuxetan was chosen as salvage therapy. The abnormal shadow on her pulmonary images was significantly reduced two months later, and she had no symptoms without nonhematological toxicities. She has had no progression for 18 months. Furthermore, radiation pneumonitis has not also been observed. We herein reported bulky pulmonary MALT lymphoma treated with yttrium-90 ibritumomab tiuxetan.
    11/2013; 2013:675187. DOI:10.1155/2013/675187
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    • "It is known that complete remission can be seen in at least 20% of patients with t(11;18)(q21;q21). The incidence of positivity for this translocation MALT lymphoma is at approximately 20% in Europe [16, 17] but is not as common in the United States where only 5% are positive [18]. "
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    ABSTRACT: Nowadays, it is believed that the main role in the development of gastric mucosa-associated lymphoid tissue (MALT) lymphoma plays Helicobacter pylori infection. This world-wide distributed bacteria is in charge of most cases of not only upper gastrointestinal tract disorders but also some of extragastric problems. Constant stimulation of the immune system causes a B-lymphocytes proliferation, which is considered to be responsible for the neoplastic transformation. On the other hand, there are 10%-20% of patients who do not respond to Helicobacter pylori eradication treatment. This group has often a chromosome translocation, which suggests that there is another unknown, so far, pathogenetic mechanism of MALT lymphoma. Majority of genetic abnormalities are connected with nuclear factor- κ B (NF- κ B) pathway, which activates the uncontrolled proliferation of neoplastic cells. Translocations already described in studies are t(11;18)(q21;q21), which is the most common, t(14;18)(q32;q21), t(14;18)(q32;q21), and t(3;14)(p14.1;q32). This non-Hodgkin's lymphoma is an indolent type originated outside lymph nodes. In more than 50% of cases, it occurs in the stomach. Occasionally, it can be found in salivary and thyroid gland, lung, breast, bladder, skin, or any other place in the human body. This paper is a review of the current knowledge on etiology, pathogenesis, treatment, and follow-up of gastric MALT lymphoma.
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