CEACAM5 and non-small cell lung carcinoma: In addition, the AUC of CTC combined with CEA, nodule type, nodule size, and nodule site was 0.841, and the 95% confidence interval was 0.769–0.914, which indicates a satisfactory discrimination of patients with early-stage NSCLC from those with benign lung nodules (Fig. 3a and Table 3).