ERCC2 and osteosarcoma: We found that ERCC2 rs1799793 (A>G) gene polymorphism was not associated with osteosarcoma risk (A allele: OR = 0.85, 95% CI: 0.63–1.14, P = 0.28; AA genotype: OR = 0.82, 95% CI: 0.54–1.23, P = 0.33; GG genotype: OR = 0.86, 95% CI: 0.44–1.68, P = 0.66).