CD8A and nonpapillary renal cell carcinoma: Meanwhile, through the validation of the external cohort and the correlation analysis of the immune microenvironment, we proved that IFNAR1 is the key gene regulating immune escape in ccRCC, and we also found that the function of IFNAR1 in promot-ing immune activation is achieved by facilitating the infiltration of CD4+ T cells and CD8+ T cells.