XRCC1 and breast cancer: The associations between BC risk and haplotypes of studied polymorphisms of DNA repair genes (hOGG1 rs1052133/APE1 rs1130409/ RAD51 rs2619679/RAD51 rs5030789/XRCC1 rs25487/XPD rs13181/hMSH2 rs4987188/XPG rs17655/XRCC3 rs861539/XRCC2 rs3218536) were assessed in this study.