Study found that miR‐21 was one of the targets of GAS5, and the two had a negative correlation and contributed to the prognosis of cancers.19 To explore the relation between GAS5 and miR‐21 in bladder cancer, we first analyzed the relation between GAS5 or miR‐21 and bladder cancer patients' clinical data. This evidence concerns the gene GAS5 and urinary bladder carcinoma.