SOX9 and urothelial carcinoma: Immunohistochemical staining was performed to evaluate the expression of SOX9 protein in the carcinoma lesions of 67 urothelial carcinoma cases (pTa: 25 cases, pT1: 17 cases, pT2: 12 cases, and pTis: 13 cases) collected during TUR (Table 1, Figure 1).