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From the Registry of Experimental Cancers,*
National
Cancer Institute, and the Laboratory of
Immunopathology,
National Institute of
Allergy and Infectious Diseases, National Institutes of Health,
Bethesda, Maryland, and the Zentrum für Pathologie und angewandte
Krebsforschung,
Universität Kiel,
Kiel, Germany
Splenic marginal zone lymphomas (MZLs) have been found to occur at a high frequency in NFS.N mice congenic for high-expressing ecotropic murine leukemia virus (MuLV) genes from AKR and C58 mice. Based on morphological, immunological, and molecular studies of these mice, MZL is clearly recognizable as a distinct disease with a characteristic clinical behavior. MZL was staged according to the degree of accumulation and morphological change of cells within the splenic marginal zone, as follows: 1) a moderate increase in normal-looking MZ cells, judged to be prelymphomatous, and 2) MZL in three variants: i) distinct enlargement of MZ by normal-looking cells (MZL), ii) distinct enlargement of MZ by basophilic centroblast-like cells (MZL+), and iii) extensive splenic involvement by centroblast-like cells (MZL++). The rate of mitosis and apoptosis increases with lymphoma grade. In most cases, emergence of a dominant IgH clonal pattern in paired splenic biopsy and necropsy samples was correlated with progression. MZLs were transplantable and homed to the spleen. MZL may constitute a commonly occurring lymphoma type unrecognized, in part, because of the centroblastic morphology of high-grade MZL and possible overgrowth of lower-grade MZL by more aggressive follicular lymphomas.
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