ACE2 and lung cancer: Interestingly, when looking at ACE2 expression in different pathological stages (1 to 4), no differences was observed in any of the two lung cancer types (Figure 1C-D), suggesting stage might not the factor affecting ACE2 expression in lung tumor and therefore no significant differences in the susceptibility to SARS-CoV-2 infection among the pathological stages for LUAD and LUSC patients.