CD274 and clear cell renal carcinoma: Some studies could support our findings, for instance, Xiao and colleagues assessed the expression levels of mRNA and protein of PD-L1 in 330 patients with non-metastatic clear cell renal cell carcinoma via qRT-PCR and IHC test, respectively, and 292 patients had consistent results for mRNA and the PD-L1 protein (26), indicating that the evaluation of PD-L1 expression based on qRT-PCR technology is predictive valuable.