CD274 and renal carcinoma: Furthermore, in a study conducted by Choueiri et al. on nonclear-cell renal cell carcinoma (RCC), PD-L1 expression was found in various renal carcinomas (chromophobe RCC, papillary RCC, Xp11.2 translocation RCC and collecting duct carcinoma) with the collecting duct and X11p translocation having an expression rate of 20 and 30% respectively [18].