CXCL14 and lung cancer: ROC curve analysis showed that plasma CXCL14 achieved an AUC of 0.9353 [95% confidence interval (CI), 0.9034–0.9672] at a cutoff point of 840.3 pg/ml for diagnosis of stage I lung cancer, with 81.02% sensitivity and 92.5% specificity (Figure 2D).