This retrospective investigation analyzed the role of the cytokines IL1-β, sIL-2R, IL-6, IL-8, IL-10 and TNF-α as potential markers for major post-transplant adverse events including VOD, skin and intestinal GvHD, sepsis as well as bacterial, viral and fungal infections in 61 pediatric patients. The gene discussed is IL6; the disease is Sepsis.