SLC22A13 and nonpapillary renal cell carcinoma: As shown in Figures 3(a), the expression levels of SLC22A6, SLC22A7, SLC22A13, SLC25A4, SLC34A1, and SLC44A4 mRNAs in ccRCC were significantly decreased, and the difference was statistically significant (P < 0.01 and ∣Log2FC∣ > 1).