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DOI: 10.1160/TH16-02-0123
Decreased platelet reactivity in patients with cancer is associated with high risk of venous thromboembolism and poor prognosis
Financial support: This study was supported by funds of the Austrian National Bank (Anniversary Fund; project number 14744), Funds of the Mayor of Vienna (Bürgermeister-Fonds; project number 14056) and by the Austrian Science Fund (FWF), Special Research Program (SFB) 54.Publikationsverlauf
Received:
15. Februar 2016
Accepted after major revision:
09. September 2016
Publikationsdatum:
14. November 2017 (online)
Summary
Platelets are suggested to play a crucial role in cancer progression and the prothrombotic state of cancer patients. Here, we aimed to examine the activation status of platelets in cancer patients and investigate their association with risk of death and occurrence of venous thromboembolism (VTE) in a prospective observational cohort study. We measured platelet surface P-selectin, activated glycoprotein (GP) IIb/IIIa and monocyte-platelet aggregate (MPA) formation in vivo and platelet response to ex vivo stimulation with agonists of protease-activated receptor (PAR) −1, −4, and GPVI, by whole blood flow cytometry, before beginning of chemotherapy and repeatedly during the first six months thereafter (total number of samples analysed: 230). Endpoints of the study were occurrence of death or VTE during a two-year follow-up, respectively. Of 62 patients (median age [interquartile range, IQR]: 63 [54–70] years, 48 % female), 32 (51.6 %) died and nine (14.5 %) developed VTE. Association with a higher risk of death was found for lower platelet surface expression of P-selectin and activated GPIIb/IIIa in vivo and in response to PAR-1, −4 and GPVI activation, but not for MPA formation. Furthermore, reduced platelet responsiveness to PAR-1 and GPVI agonists was associated with higher risk of VTE (hazard ratio per decile increase of percentage P-selectin positive platelets: 0.73 [0.56–0.92, p=0.007] and 0.77 [0.59–0.98, p=0.034], respectively). In conclusion, cancer patients with a poor prognosis showed decreased platelet reactivity, presumably as a consequence of continuous activation. Our data suggest that decreased platelet reactivity is associated with increased mortality and VTE in cancer.
Supplementary Material to this article is available online at www.thrombosis-online.com.
# These authors share senior authorship.
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