USP18 and urinary bladder carcinoma: To confirm whether USP18 could be a target gene of miR‐328‐3p, we transfected a luciferase reporter vector harbouring the USP18 3′‐UTR into bladder cancer cell lines (Figure S24A, Supporting Information), and relative luciferase activity was then detected after miR‐328‐3p mimic transfection.