ERCC2 and osteosarcoma: We found that ERCC2 rs13181 (Lys751Gln) gene polymorphism was not associated with osteosarcoma risk (A allele: OR = 1.8, 95% CI: 0.93–1.78, P = 0.13; AA genotype: OR = 1.01, 95% CI: 0.72–1.43, P = 0.94; GG genotype: OR = 0.79, 95% CI: 0.53–1.17, P = 0.24).