H2AX and breast cancer: The post-hoc analysis revealed that the statistical power of our study for analyses of the differences in distribution of alleles at loci rs7759, rs8551 and rs2509049 (OR: 1.3 to 1.47 for the three H2AFX SNPs with a frequency of 0.28 to 0.35) between BC patients and controls ranged between 71 and 94%.