ENTPD1 and nonpapillary renal cell carcinoma: The top two immunostimulators positively correlated with A2M in ccRCC were ENTPD1 (Cor = 0.598, p < 2.2e-16) and RAET1E (Cor = 0.506, p < 2.2e-16) (Figure 6B1-B2).