CEACAM5 and pulmonary emphysema: (4) Y1 = 0.546 × age + 0.007 × smoking + 0.58 × diameter + 22.899 × emphysema + 27.887 × vascular sign + 8.628 × burr + 5.162 × (CYFRA21-1) −0.624 × CEA + 0.186 × (miRNA-21-5p) − 0.098 × (miRNA-574-5p) − 55.555.