In addition, a dominant MUC1 staining was also shown in lung tissue from deceased COVID-19 patients (Supplemental Figure 3, C and D) and in pulmonary biopsies collected from patients with an exudative phase of COVID-19 (Supplemental Figure 3, E and F), further underlining a potential role for MUC1 in the severe course of the disease. This evidence concerns the gene MUC1 and COVID-19.