PPBP and lung cancer: Furthermore, Du et al. (2018b) found that CXCL7 had a higher diagnostic efficacy for NSCLC (AUC of ROC: 0.806, 95% CI: 0.748–0.863) compared to traditional diagnostic biomarkers for lung cancer (CEA, SCCAg, and Cyfra211) (Du et al., 2018b).