Résumé : Circulating microparticles are reported to play a role in cancer hypercoagulability. The procoagulant properties of microparticles derive from the amount of tissue factor and/or phosphatidylserine that they can expose. The aim of our study is to assess the procoagulant activity, including microparticles' activity, in the plasma of newly diagnosed cancer patients with a simple assay, easy to implement in the laboratory.