XRCC5 and breast cancer: Logistic regression analyses showed that XRCC5 rs16855458 was associated with increased breast cancer risk in the co‐dominant genetic model (ptrend = 0.003), and the dominant genetic model (CA + AA vs. CC: OR = 1.29, 95% CI = 1.07–1.56, p = 0.008) after the Bonferroni correction.