ccRCC patients aged between 40 and 60 years and older than 60 years have 2.1 times (95% CI: 1.2–3.9) and 2.3 times (95% CI: 1.3–4.2) higher AOX1 mRNA expression than that in patients younger than 40 years, respectively (Figure 5B). Here, AOX1 is linked to nonpapillary renal cell carcinoma.