T-cell-rich large B-cell lymphoma. A study of 30 cases, supporting its histologic heterogeneity and lack of clinical distinctiveness.
To determine whether correlations existed between morphologic and immunophenotypic findings and clinical characteristics, 30 cases of T-cell-rich large B-cell lymphomas (TBL) were evaluated by histopathology, immunostaining, and polymerase chain reaction on paraffin-embedded material. All were characterized by a polymorphic cell composition, including a variable mixture of small and large lymphoid cells and reactive cell. Most cases (87%) fitted into one of three main histologic types of non-Hodgkin's lymphoma (diffuse, mixed cell; diffuse, large cell; follicular and diffuse, mixed cell), and one group of eight cases had the prototypic features described by Ramsay et al. (17). All cases showed a component of large CD20(L26)+ MB2+ B cells in a predominant back-ground of reactive T cells (> 50% of the total lymphoid forms). Clonality was demonstrated by light chain restriction in 67% of cases and by rearrangement of the immunoglobulin heavy chain gene and bcl-2 gene in 64% and 28% of cases, respectively. The patients were predominantly men (70%), ages 18-83 years (median of 62.5), and were initially seen predominantly with nodal disease (and extranodal involvement in 20%) at advanced stages (III-IV: 77%). Treatment was mostly aggressive chemotherapy, and the outcomes were favorable (84% alive and well). These features are not distinctive as compared with those of typical large-cell lymphoma, nor did subgroups within the series (prototypic cases versus others; cases with less [< or = 70%] or more [> 70%] T-cell infiltration) significantly differ in clinical presentation or outcome. Thus, this study confirms that TBL, while useful as a diagnostic variant to be distinguished from both peripheral T-cell lymphoma and Hodgkin's disease, is a heterogeneous assortment of diverse histopathologic categories rather than a clinicopathologic entity. The term "T-cell rich" might, however, be usefully retained as a morphologic specification to be added to recognized histologic categories of lymphoma.
Krishnan
J
J
Department of Hematopathology, Armed Forces Institute of Pathology, Washington, D.C.
Wallberg
K
K
Frizzera
G
G
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D005260:Female; D005838:Genotype; D006801:Humans; D016130:Immunophenotyping; D016393:Lymphoma, B-Cell / Q000235:genetics / Q000473:pathology* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction; D013601:T-Lymphocytes / Q000473:pathology*