XRCC1 and chronic myelogenous leukemia, BCR-ABL1 positive: In the study mentioned above, the frequency of XRCC1 Gln, His, and Trp alleles was 0.50, 0.006, and 0.85 in CML patients, whereas it was 0.49, 0.018, and 0.81, respectively, in controls [14].