The combination of these four miRNAs plus CEA showed an AUC of 0.972, a sensitivity of 97.3%, and a specificity of 85.7% to distinguish NSCLC from gastric cancer (P < 0.0001; 95% CI: 0.928–0.993; Fig 7 and S4 Table). Here, CEACAM5 is linked to non-small cell lung carcinoma.