Expression levels of 9 MUCINs were significantly altered in ccRCC patients (p < 0.05), including six membrane‐bound MUCINs (MUC1, MUC3A, MUC12, MUC13, MUC15, and MUC20), one secreted MUCIN (MUC6), and two atypical MUCINs (EMCN and MCAM) (Figure 2). Here, MUC15 is linked to nonpapillary renal cell carcinoma.