We also did the same analyses on GSE13507 (Supplementary Figure 2), GSE31684 (Supplementary Figure 3), GSE32548 (Supplementary Figure 4), and TCGA-BLCA (Supplementary Figure 5), and the results indicated that these 6 ECM hub genes were deeply associated with tumor stage and prognosis of bladder cancer patients. Here, MMRN1 is linked to urinary bladder carcinoma.