In contrast, some alleles were significantly less frequent in the CML population, namely, the A allele of ABCG2 rs2231142 (OR = 0.589, 95%CI 0.388–0.892, p = 0.012), the G allele of SLC22A5 rs274558 (OR = 0.598, 95%CI 0.469–0.762, p < 0.001), and the C allele at rs2631365 of the same gene (OR = 0.682, 95%CI 0.534–0.869, p = 0.002). This evidence concerns the gene ABCG2 and chronic myelogenous leukemia, BCR-ABL1 positive.