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Cytokines have been shown to play an important role in promoting inflammation in the setting of ischemia–reperfusion injury. However, their role in human lung transplantation has not been systematically explored. This study was undertaken to examine the kinetics of cytokine release in 18 consecutive human lung transplantation procedures and to examine the relationships between their levels and donor factors, length of ischemic time, and allograft function. TNF- α , IFN- γ , IL-10, IL-12, and IL-18 were found at higher levels during the ischemic time, whereas IL-8 predominantly increased after reperfusion. IL-8 levels after 2 h of reperfusion correlated with lung function assessed by the Pa_O2/Fi _O2 ratio, the mean airway pressure, and the APACHE score during the first 24 postoperative hours. The length of ICU stay also correlated with IL-8 levels after 2 h of reperfusion. Longer ischemic time was …