Journal
HISTOPATHOLOGY
Volume 59, Issue 6, Pages 1173-1182Publisher
WILEY
DOI: 10.1111/j.1365-2559.2011.04069.x
Keywords
AITL; epithelioid cell-rich lymphomas; Lennert's lymphoma; PTCL NOS
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Funding
- Volkswagen Stiftung
- Associazione Italiana Ricerca sul Cancro [IG 1007]
- Forderung Nachwuchsforscher Fachbereich Medizin der Johann Wolfgang Goethe-Universitat Frankfurt
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Aims: Lennert's lymphoma is a rare variant of peripheral T-cell lymphoma (PTCL) not otherwise specified (NOS). The aim of this study was to further characterize this tumour. Methods and results: Historical material of 97 lymphomas with a high content of epithelioid cells, collected at the Kiel Lymph Node Registry were reviewed, by applying immunohistochemistry and current diagnostic criteria. Among all cases revised, various B-cell lymphoma entities (25 cases), Hodgkin lymphomas (21 cases) and PTCL subtypes (48 cases) could be identified. A distinctive subgroup of eight PTCLs was found that were regarded as genuine Lennert's lymphomas. These cases were characterized by mild atypia, a non-activated cytotoxic phenotype [TIA1 cytotoxic granule-associated RNA binding protein (TIA1)-positive(+) and granzyme B-negative], and a substantial lack of follicular T-helper (T-FH) cell markers. Among the other PTCLs, including angioimmunoblastic T-cell lymphoma and PTCL NOS, many cases with positivity for more than three TFH cell-associated molecules were recorded. Conclusions: Our study shows that, according to current criteria, Lennert's lymphoma is a rare but distinctive entity among epithelioid cell-rich lymphomas, differing on grounds of morphology and immunophenotype from other PTCL subtypes. An additional finding is the broad morphological spectrum of epithelioid-cell rich PTCLs showing a T-FH cell phenotype.
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