CCNF and nonpapillary renal cell carcinoma: We first determined the IHC expression of cyclin F in two independent TMA cohorts: in-house cohort (TMA_1), consisting of 108 ccRCC tissues and 37 adjacent non-tumor tissues, and the other, commercially purchased one (TMA_2), encompassing 192 ccRCC cases and 16 samples of normal renal tissue.