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The association between XRCC6/Ku70, an upstream player in the DNA double-strand break repair system, and the risk of nasopharyngeal carcinoma (NPC) was examined. In this case–control study, 176 NPC patients and 352 cancer-free controls were genotyped, and the associations of XRCC6 promoter T–991C (rs5751129), promoter G–57C (rs2267437), promoter G–31A (rs132770), and intron 3 (rs132774) polymorphisms...
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