Circulating endothelial cells in patients with chronic lymphocytic leukemia

Ronald S. Go, Dean A. Jobe, Krista E. Asp, Steven M. Callister, Michelle A. Mathiason, Lori A. Meyer, Wayne A. Bottner, Craig E. Cole, John P. Farnen, Kathleen A. Frisby

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Angiogenesis is increased in B-cell chronic lymphocytic leukemia (B-CLL). We wanted to quantify and characterize the circulating endothelial cells (CECs) in patients with B-CLL and correlate with plasma angiogenesis-related factors. Using a four-color flow cytometry, we prospectively analyzed the CEC in the whole blood of 20 healthy controls and 20 patients with B-CLL. We quantified (CD45-/CD31+/CD146+) and characterized the CECs according to whether they were apoptotic (annexin stain) or activated (CD106+). We also measured plasma levels of vascular endothelial growth factor (VEGF), fibroblast growth factor-2 (FGF-2), and thrombospondin-1 (TSP-1). Most patients (90%) had Rai stages 0-2 at the time of diagnosis. As a group, B-CLL patients had higher number of CECs (median of 26.5 cells/ml) compared (P = 0.04) to healthy controls (18.5 cells/ml). However, only four (20%) patients had elevated CEC counts, defined as ≥2 SD of the control mean (≥53 cells/ml). The proportions of apoptotic (P = 0.83) and activated (P = 0.12) CECs were similar in both groups. B-CLL patients had higher FGF-2 (P < 0.001), lower TSP-1 (P = 0.004), and similar VEGF (P = 0.27) plasma levels. The number of CECs was not associated with Rai stage, absolute lymphocyte count, or levels of angiogenesis-related factors. CECs are increased in only a small fraction of B-CLL patients in our cohort with low rates of apoptosis and activation. While no correlation was found between CECs and clinical features, more studies in a larger patient sample size and advanced disease are necessary.

Original languageEnglish (US)
Pages (from-to)369-373
Number of pages5
JournalAnnals of hematology
Issue number5
StatePublished - May 2008


  • Angiogenesis
  • B-cell
  • Chronic
  • Circulating
  • Endothelial
  • Leukemia
  • Thrombospondin

ASJC Scopus subject areas

  • Hematology


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