CYP2D6 and chronic myelogenous leukemia, BCR-ABL1 positive: In our research, the CYP2D6 GA IM phenotype was strongly associated with a reduced risk of developing Ph-ve CML (OR = 0.035, 95% CI: 0.004–0.337, p = 0.004), whereas the AA leading to a PM phenotype showed no significant association with Ph-ve CML (OR = 0.375, 95% CI = 0.033–4.228, p value = 0.427).