PAN2 and bladder transitional cell carcinoma: To further investigate the regulatory relationship between USP52 and xCT at the protein level, we mixed siNC and siUSP52 BLCA cells and then performed immunofluorescence staining assays, which revealed that knockdown of USP52 efficiently decreased the protein level of xCT in T24 and UM‐UC‐3 cells (Figure S6B, Supporting Information).