We next analyzed the associations between XRCCs mRNA expression and disease-free survival (DFS) of HCC patients, and the results exhibited that high mRNA expression of XRCC1/2/3/6 was significantly associated with shorter DFS of HCC patients (Figures 6(a)–6(c), 6(f)), while mRNA expression of XRCC4/5 showed no predictive values in estimating DFS of HCC patients (Figures 6(d) and 6(e)). The gene discussed is XRCC4; the disease is hepatocellular carcinoma.