TTC13 and nonpapillary renal cell carcinoma: Although the role of TPR-related proteins in tumors has been reported in leukemia, liver cancer, and gastric cancer (El-Daher et al., 2018; Shaheen et al., 2020), the function of TTC13 in tumors is not clear, and the expression and biological functions of TTC13 in ccRCC need to be determined.