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Blood, 1 January 2002, Vol. 99, No. 1, pp. 3-9
PLENARY PAPER
Gastric marginal zone B-cell lymphomas of MALT type develop
along 2 distinct pathogenetic pathways
Petr Starostik,
Jochen Patzner,
Axel Greiner,
Stephan Schwarz,
Jörg Kalla,
German Ott, and
Hans Konrad Müller-Hermelink
From the Institute of Pathology, Würzburg
University, Germany.
Low-grade marginal zone B-cell lymphoma of mucosa-associated
lymphoid tissue (MALT) type can transform into high-grade diffuse large
B-cell lymphoma (DLBCL). Up to 60% of the MALT lymphomas contain the
recently described t(11;18). However, this translocation has
not been detected in any DLBCL so far. To elucidate the pathogenesis of
these tumors, microsatellite screening of 24 gastric MALT lymphomas was
performed and the results were compared with aberrations detected in a
previous study on gastric DLBCL. The most frequent aberration, found in
21% of the MALT lymphomas that were exclusively t(11;18)-negative cases, was amplification of the 3q26.2-27 region (harboring the locus
of the BCL6 gene). Allelic imbalances in regions 3q26.2-27, 6q23.3-25, 7q31, 11q23-24, and 18q21 were shared by both MALT lymphoma
and DLBCL. Loss of heterozygosity in regions 5q21 (APC gene
locus), 9p21 (INK4A/ARF), 13q14 (RB), and 17p13
(p53) and allelic imbalances in 2p16, 6p23, and 12p12-13
occurred exclusively in DLBCL. Only one of 10 t(11;18)-positive
MALT lymphomas showed an additional clonal abnormality. These tumors
thus display features of a clonal proliferation characterized by the
presence of the t(11;18). However, they only rarely display secondary
aberrations and do not seem to transform into DLBCL. In contrast,
t(11;18)-negative MALT lymphomas show numerous allelic imbalances some
of them identical with aberrations seen in DLBCL suggesting that this
group is the source of tumors eventually transforming into high-grade DLBCL.

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