CEACAM5 and COVID-19: Figure 3 shows the ROC curves of CEA levels with the AUC of 0.790 (P < 0.001) in distinguishing moderate cases from discharged COVID-19 patients after considering age as a cofounding factor by weighted ROC analysis. The results of Spearman's correlation analyses (Figure 4) indicated that there was a positive correlation of CEA levels with CT scores in discharged patients (Correlation Coefficient: 0.687; P < 0.001). The Figure 5 showed chest CT scans and CEA levels of three female patients in similar old age (69, 70, 71).