Heterogeneity of CD5 membrane expression on b-chronic lymphocytic leukemia cells

Neil E. Kay, Loann Peterson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The CD5 antigen has been used to characterize the typical B-chronic lymphocytic leukemia B cell. CD5 antigen while found on mature T cells is also frequently found on malignant clonal B cells in B-CLL. We have sequentially evaluated the presence of CD5 antigen on a group of B-CLL cells using flow cytometry. Purified peripheral blood B cells from B-CLL patients were studied for the presence of both CD19 and CD5. This approach insured that the presence of CD5 antigen was only assessed on CD19 positive B cells. Our data suggests that there is considerable heterogeneity for presentation of CD5 antigen in clonal B cells in this disease. We define 3 B cell groups based on the presentation of CD5; low CD5, intermediate CD5 and high CD5 antigen positive B cells. In addition sequential analysis over several months of study indicates that the CD5 antigen is consistently present on these clonal B cells. Low CD5 B cells appear to have an excess of kappa phenotype. In conclusion CD5 antigen may be considerably more heterogeneous on clonal CLL B cells than previously thought. This variable presentation of CD5 antigen on CLL B cell clones needs to be considered in the assessment and characterization of B-CLL.

Original languageEnglish (US)
Pages (from-to)49-55
Number of pages7
JournalLeukemia and Lymphoma
Issue number1
StatePublished - Jan 1 1991


  • CD5 CLL cells

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research


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