ERCC2 and osteosarcoma: We found that ERCC2 rs1799793 (Asp312Asn) gene polymorphism was not associated with overall survival of osteosarcoma (T allele: OR = 0.85, 95% CI: 0.71–1.03, P = 0.09; TT genotype: OR = 0.80, 95% CI: 0.55–1.16, P = 0.24; CC genotype: OR = 1.18, 95% CI: 0.94–1.49, P = 0.16; Figure 4).