CCL21 and nonpapillary renal cell carcinoma: According to the analysis on 11 SLC members, 6 SLC members were highly expressed in non-cancerous tissues (SLC5A2, SLC12A1, SLC12A3, SLC34A1, SLC34A2, SLC34A3), while SLC12A5 and SLC12A7 were highly expressed in ccRCC tissues (Figure 5A).