ERCC2 and hepatocellular carcinoma: There was no evidence of significant association between the XPD Asp312Asn polymorphism and HCC risk when all eligible studies were pooled into the meta-analysis (Asn/Asn vs Asp/Asp: OR = 0.959, 95% CI 0.761–1.208, P = 0.720; Asp/Asn vs Asp/Asp: OR = 1.048, 95% CI 0.920–1.195, P = 0.479; Asn/Asn+Asp/Asn vs Asp/Asp: OR = 1.031, 95% CI 0.913–1.163, P = 0.625; Asn/Asn vs Asp/Asn+Asp/Asp: OR = 0.925, 95% CI 0.660–1.295, P = 0.648).