Feasibility Study of Platelet Activation and Inflammatory Response of Platelets in Hematopoietic Stem Cell Allograft Patients Post-transplant: Spontaneously and After Stimulation by an CMV Antigen

The descriptive present study will determine if platelet activation is altered during the post-graft follow-up (day 30 to 90). The activation will be studied spontaneously and after simulation by a CMV (Cytomegalovirus) antigen. The study will also focus on inflammatory response variation, focusing on the cytokines release during the same post-graft follow-up (spontaneously and after CMV antigen stimulation). This preliminary study could lead to a better understanding of the immune-modulator role of inflammation, controlled by the platelets, particularly in the initiation of the Graft-versus-host disease in this kind of population.