STAM and nonpapillary renal cell carcinoma: However, the outcomes of OS analyses in ccRCC patients indicated that low STAM1 level was an ideal biomarker in predicting worse survival in early-stage ccRCC patients (pT1 and 2: P < 0.0001; grade 1 and 2: P < 0.0001; AJCC stage I and II: P < 0.0001) (Figure 4).