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Increased numbers of small circulating endothelial cells in renal cell cancer patients treated with sunitinib.

Authors
  • Vroling, Laura
  • van der Veldt, Astrid A M
  • de Haas, Richard R
  • Haanen, John B A G
  • Schuurhuis, Gerrit Jan
  • Kuik, Dirk J
  • van Cruijsen, Hester
  • Verheul, Henk M W
  • van den Eertwegh, Alfons J M
  • Hoekman, Klaas
  • Boven, Epie
  • van Hinsbergh, Victor W M
  • Broxterman, Henk J
Type
Published Article
Journal
Angiogenesis
Publisher
Springer-Verlag
Publication Date
Jan 01, 2009
Volume
12
Issue
1
Pages
69–79
Identifiers
DOI: 10.1007/s10456-009-9133-9
PMID: 19212818
Source
Medline
License
Unknown

Abstract

Mature circulating endothelial cell (CEC) as well as endothelial progenitor populations may reflect the activity of anti-angiogenic agents on tumor neovasculature or even constitute a target for anti-angiogenic therapy. We investigated the behavior of CECs in parallel with hematopoietic progenitor cells (HPCs) in the blood of renal cell cancer patients during sunitinib treatment. We analyzed the kinetics of a specific population of small VEGFR2-expressing CECs (CD45(neg)/CD34(bright)), HPCs (CD45(dim)/CD34(bright)), and monocytes in the blood of 24 renal cell cancer (RCC) patients receiving 50 mg/day of the multitargeted VEGF inhibitor sunitinib, on a 4-week-on/2-week-off schedule. Blood was taken before treatment (C1D1), on C1D14, C1D28, and on C2D1 before the start of cycle 2. Also plasma VEGF and erythropoietin (EPO) were determined. Remarkably, while CD34(bright) HPCs and monocytes decreased during treatment, CD34(bright) CECs increased from 69 cells/ml (C1D1) to 180 cells/ml (C1D14; P = 0.001) and remained high on C1D28. All cell populations recovered to near pre-treatment levels on C2D1. Plasma VEGF and EPO levels were increased on C1D14 and partly normalized to pre-treatment levels on C2D1. In conclusion, opposite kinetics of two circulating CD34(bright) cell populations, HPCs and small CECs, were observed in sunitinib-treated RCC patients. The increase in CECs is likely caused by sunitinib targeting of immature tumor vessels.

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