CD177 and influenza: Importantly, area under the curve (AUC) analysis of the receiver operating characteristic curve (Fig. 7e, f) showed that CD177 expression predicted influenza-related deaths in both the discovery set (AUC 0.817, 95% confidence interval: 0.602–0.921) and the validation set (AUC 0.898, 95% confidence interval: 0.769–0.957).