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Haematologica. 2005 Apr;90(4):470-8.

Analysis of VH genes in marginal zone lymphoma reveals marked heterogeneity between splenic and nodal tumors and suggests the existence of clonal selection.

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1
Equipe Accueil 3737 Pathologie des Cellules Lymphoïdes, Université Claude Bernard, France.

Abstract

BACKGROUND AND OBJECTIVES:

To clarify the relationship between splenic (SMZL) and nodal marginal zone (NMZL) lymphomas, we analyzed immunoglobulin variable heavy chain (VH) gene usage and mutation patterns in these tumors.

DESIGN AND METHODS:

VH genes were cloned and sequenced from 49 lymphoma samples (35 SMZL and 14 NMZL).

RESULTS:

A biased usage of VH gene was found with overrepresentation of VH1 in SMZL cases (13/35) and VH4 in NMZL cases (7/14). Evidence for antigen driven mutations was identified in 8 SMZL and 4 NMZL cases. Three cases out of 18 with clones analyzed from spleen and peripheral blood demonstrated intra-clonal diversity, with evidence of clonal selection in one case, indicating the possibility of antigen-driven clonal expansion. Eleven SMZL cases (31%) but only 2 NMZL (14%) cases were unmutated. No differences in clinical outcome and overall survival were found between the unmutated and mutated cases.

INTERPRETATION AND CONCLUSIONS:

The pattern of somatic mutation and the VH gene segment usage appear to differ between SMZL and NMZL, suggesting that these are distinct pathological entities. Moreover, a biased usage of certain sequences suggests that tumor cells in SMZL may be subjected to antigen selection.

PMID:
15820942
[Indexed for MEDLINE]
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