AQP9 and nonpapillary renal cell carcinoma: As shown in Table 1, increased AQP9 mRNA expression in ccRCC patients significantly correlated with advanced pT (p < 0.001), pN (p < 0.001), and pM stage (p < 0.001), AJCC stage (p < 0.001) and ISUP grade (p = 0.004) in the FUSCC cohort.