De novo CD5+ diffuse large B-cell lymphomas. A heterogeneous group containing an unusual form of splenic lymphoma

Am J Clin Pathol. 2000 Oct;114(4):523-33. doi: 10.1309/RM1Q-1T0B-WKQB-AF5A.

Abstract

We reviewed our institutional experience with de novo CD5+, large B-cell lymphomas to determine whether they represent a distinct entity and are related to CD5+ small B-cell disorders. We identified 13 cases with multiparameter flow cytometry over a period of 58 months (5% of large B-cell lymphomas) in 7 females and 6 males. Three groups were identified. Group 1 (2 cases) had diffuse splenic red pulp involvement with a distinctive cordal pattern of infiltration, no other clinical evidence of mass disease, microscopic disseminated disease on further workup, and an identical immunoglobulin-negative immunophenotype. Group 2 cases (7 cases) were clinically and morphologically heterogeneous and had an immunophenotype resembling mantle cell lymphoma (FMC7-positive, CD23-). Group 3 (4 cases) had miscellaneous immunophenotypes, including one closely resembling chronic lymphocytic leukemia. Cyclin D1 was positive in only 1 of 10 evaluable cases (group 2). We conclude that CD5+ diffuse large B-cell lymphomas are heterogeneous; most cases do not seem to be related to chronic lymphocytic leukemia or mantle cell lymphoma. However, we identified a subgroup of primary splenic CD5+ large B-cell lymphoma with diffuse red pulp involvement and believe this may represent a distinct clinicopathologic entity.

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Antigens, CD / metabolism
  • Antigens, Neoplasm / metabolism
  • Cyclin D1 / metabolism
  • Female
  • Genes, p53
  • Humans
  • Immunoenzyme Techniques
  • Immunophenotyping
  • Lymphoma, B-Cell / classification
  • Lymphoma, B-Cell / metabolism
  • Lymphoma, B-Cell / pathology*
  • Lymphoma, Large B-Cell, Diffuse / classification
  • Lymphoma, Large B-Cell, Diffuse / metabolism
  • Lymphoma, Large B-Cell, Diffuse / pathology*
  • Male
  • Middle Aged
  • Neoplasm Staging
  • Point Mutation
  • Splenic Neoplasms / classification
  • Splenic Neoplasms / metabolism
  • Splenic Neoplasms / pathology*

Substances

  • Antigens, CD
  • Antigens, Neoplasm
  • Cyclin D1