Similar to the normal organ tissues, the corresponding tumor tissues also showed an obvious expression difference for both ACE2 and TMPRSS2, of which BLCA, CECS, CHOL, COAD, ESCA, KIRP, LUAD, LUSC, PAAD, READ, STAD, THCA, and UCEC had the higher expressions of ACE2 and TMPRSS2 compared with other tumor tissue types (Figure 3G). This evidence concerns the gene TMPRSS2 and neoplasm.