In the control group, the CEA level was 72.3 [61.7; 98.1] ng/mL, while the level of CEA increases statistically significantly in the group with benign lung diseases (108.5 [95.2; 120.6] ng/mL) and in the group with lung cancer (103.4 [90.9; 110.4] ng/mL) (Figure 2A). This evidence concerns the gene CEACAM5 and lung carcinoma.