Platelet-derived VEGF, Flt-1, angiopoietin-1 and P-selectin in breast and prostate cancer: further evidence for a role of platelets in tumour angiogenesis

Annals of Medicine
G J CaineA D Blann

Abstract

Cancer is a complex multi-factorial disorder that may commonly show abnormal angiogenesis in such patients. Recently, platelets have been postulated to have a major role in both these processes, suggesting that antiplatelet strategies may be useful in cancer treatment. To further investigate the role of platelets in angiogenesis, we used a novel platelet lysate assay to analyse platelet contents in breast cancer (n = 30) and prostate cancer (n = 30) patients and age- and sex-matched controls (n = 60). Markers of angiogenesis (vascular endothelial growth factor (VEGF), angiopoietin-1 and-2 (Ang-1, -2), and their respective receptors (Flt-1 and Tie-2) plus a marker of platelet activation (P-selectin (P-sel)), were all measured in platelet lysate by enzyme-linked immunsorbent assay. Platelet lysate from breast cancer patients contained higher levels of VEGF (P < 0.0001). Ang-1 (P = 0.0186) and P-sel (P = 0.0002), compared to healthy controls. Platelet lysate from prostate cancer patients had elevated VEGF (P = 0.008) but not Ang-1 or P-sel. There were no significant differences between levels of Fit-1 between patients and controls, and both Ang-2 and Tie-2 were undetectable in both patient groups and control platelet lysate. We ha...Continue Reading

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