XRCC6 and nasopharyngeal carcinoma: Table 3 summarizes the distributions of NHEJ genotypes and their associations with NPC risk, including XRCC4 (rs6869366, rs3734091, rs28360071, rs28360317, rs1805377), XRCC5 (rs828907, rs11685387, rs9288518), XRCC6 (rs5751129, rs2267437, rs132770, rs132774), XRCC7 rs7003908, and Ligase4 rs1805388 genotypes, among NPC patients and controls.