TMPRSS4 and cancer: TheTIMER2.0 database25 was utilized for theassessment of co-expression of SLC6A20 with ACE2,TMPRSS2, and TMPRSS4 in TCGA pan-cancer samples and showed that amongthe gastrointestinal cancers, ESCA, PAAD, and STAD together with UCECand UCS exhibited positive correlation with SLC6A20 gene expression (Figure 4A).