We analysed the TCGA database using GEPIA2 software (http://gepia2.cancer-pku.cn/#index, accessed on 7 April 2022) [25] to evaluate GSTT2 mRNA expression in bladder cancer and normal tissues (Figure 2F), and a wide variation in GSTT2 expression was found. The gene discussed is GSTT2; the disease is urinary bladder cancer.