The ROC curve analysis demonstrated that the discriminative abilities of liver cancer for RRM1, RRM2, and RRM2B were 0.903 (95% CI: 0.873-0.933, Figure 3(g)), 0.961 (95% CI: 0.939-0.984, Figure 3(h)) and 0.767 (95% CI: 0.715-0.820, Figure 3(i)), respectively. The gene discussed is RRM2B; the disease is liver cancer.