TGFB1 and chronic myelogenous leukemia, BCR-ABL1 positive: For the initial analysis of the cytokine polymorphism of all patients with CML on TKI treatment (n = 51), we observed that some cytokine polymorphisms do not occur in this Ethiopian patient cohort, such as TGF-β T/T C/C (low), TGF-β T/C C/C (low), and TGF-β T/T G/C (intermediate) (Table 3).