[Clonal relationship between transformed and non-transformed components in mucosa-associated lymphoid tissue lymphoma].
OBJECTIVE
To analyze the clonal relationship between transformed and non-transformed components in mucosa-associated lymphoid tissue (MALT) lymphoma.


METHODS
Six cases of MALT lymphoma with high-grade transformation were studied. Immunohistochemical study was carried out by EliVision using bcl-10 antibody. Reverse transcription-polymerase chain reaction was used to detect the presence of API2-MALT1 fusion gene transcripts. The target cells were selected by laser microdissection and studied by polymerase chain reaction and sequence analysis for rearrangement of immunoglobulin heavy chain gene.


RESULTS
In the 6 cases of MALT lymphoma with high-grade transformation, nuclear and cytoplasmic expression of bcl-10 was demonstrated in 1 case, while API2-MALT1 fusion gene was present in 2 cases. Identical fragments of rearranged immunoglobulin heavy chain gene were detected in both transformed and non-transformed components in each of the 6 cases, except for the differences at 2 nucleotide positions in N or D regions in 2 cases.


CONCLUSIONS
The tumor cells from both transformed and non-transformed components in MALT lymphoma derive from the same clone.
Jiang
Wei
W
Department of Pathology, West China Hospital, Sichuan University, Chengdu 610041, China.
Li
Gan-di
GD
Li
Lei
L
Tang
Yuan
Y
He
Yan-mei
YM
D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism; D000328:Adult; D000368:Aged; D000074018:B-Cell CLL-Lymphoma 10 Protein; D001483:Base Sequence; D002467:Cell Nucleus / Q000378:metabolism; D002471:Cell Transformation, Neoplastic; D003001:Cloning, Molecular; D003593:Cytoplasm / Q000378:metabolism; D005260:Female; D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain / Q000235:genetics*; D006801:Humans; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged; D015514:Oncogene Proteins, Fusion / Q000378:metabolism; D016133:Polymerase Chain Reaction
C415943:API2-MALT1 fusion protein, human; D048868:Adaptor Proteins, Signal Transducing; D000074018:B-Cell CLL-Lymphoma 10 Protein; C118591:BCL10 protein, human; D015514:Oncogene Proteins, Fusion