CXCL14 and urinary bladder carcinoma: To investigate whether STAT3 binds to the promoter region of ERCC4 and how CXCL14 enhances its expression in bladder cancer cells, we overexpressed STAT3 in 293 T cells (Fig. S4B) as an external validation and modulated STAT3 phosphorylation in T24 cells with rhCXCL14 or rhCXCL14 combined with STAT3i (Fig. S4C).