XRCC4 and colorectal carcinoma: However, no association between the concurrence of the XPD locus A allele and the XRCC4 locus T allele and the risk of CRC was found (OR = 0.794, 95%CI = 0.572–1.101, P=0.150; adjusted OR = 0.654, 95%CI = 0.787–1.054, P=0.196).