[17] confirmed significantly (P < 0.001) reduced GRHL3 mRNA expression in squamous/basal tumors (n = 108) compared to luminal‐type bladder cancer including luminal (n = 23), luminal‐infiltrated (n = 58), and luminal‐papillary (n = 110) cancers (Fig. 1C). Here, GRHL3 is linked to urinary bladder carcinoma.