As shown in Fig. 4a, age (ref. low), grade (ref. grade1), stage (ref. stage1), pT (ref. T1), pM (ref. M0), riskscore (ref. low), ULBP2, CXCL2, NDRG1, VAV3, IGLV9-49, BMP1, IL34, PMCH, KDR, TEK, TRBV7-4 (ref. low) had been proven to be an important predictor for patients with ccRCC (p < 0.05). The gene discussed is NDRG1; the disease is nonpapillary renal cell carcinoma.