Variable CD7 expression on T cells in the leukemic phase of cutaneous T cell lymphoma (Sézary Syndrome)

Eric C. Vonderheid, Robert D. Bigler, Amy Kotecha, Christine M. Boselli, Stuart R. Lessin, Maria Grazia Bernengo, Marcia Polansky

Research output: Contribution to journalArticlepeer-review

Abstract

CD7, a molecule normally expressed on 90% of normal CD4+ T cells, is often deficient on the malignant T cells of cutaneous T cell lymphoma. To investigate the clinical and biologic implications of CD7 expression, blood lymphocytes from 42 patients with the leukemic phase of cutaneous T cell lymphoma (CD4/CD8 ratio of 10 or more with evidence of a T cell clone in the blood) were analyzed for level of expression of CD7 by flow cytometry. CD7 expression by cells did not clearly segregate into two distinct subgroups that are either CD7 positive or CD7 negative as generally thought; however, nine of 17 patients with a predominantly CD4+CD7+ tumor population on early studies became CD4+CD7- over time whereas the converse situation was not observed. In addition, of three patients with evidence of large tumor cells in the blood coexisting with smaller cells, discordant CD7 expression was observed in one instance. In lymph node specimens, the percentage of cells expressing CD7 and other T cell markers did not correlate with histologic evidence of involvement. CD7 expression on blood lymphocytes also did not correlate with patients' survival nor to serum IgE levels or blood eosinophil counts, a finding suggesting that this marker does not identify functional cell subsets that produce serum interleukin-4 or -5, respectively. We speculate that the level of CD7 expression on malignant T cells may be the effect of sustained antigen stimulation in vivo analogous to what has been proposed to occur with normal T cells during aging.

Original languageEnglish (US)
Pages (from-to)654-662
Number of pages9
JournalJournal of Investigative Dermatology
Volume117
Issue number3
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • CD4
  • Flow cytometry
  • Th2

ASJC Scopus subject areas

  • Dermatology

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