ABCB1 and chronic myelogenous leukemia, BCR-ABL1 positive: For ABCB1 rs1045642, the carriers of one or two T alleles presented increased risk of CML development (MCD CT: OR = 1.469, 95%CI 1.017–2.121, p = 0.040/TT: OR = 2.373, 95%CI 1.343–4.193, p = 0.003; MR TT: OR = 1.929, 95%CI 1.134–3.28, p = 0.015), while the CC genotype showed a protective effect (MD: OR = 0.62, 95%CI 0.438–0.884, p = 0.008).