The most frequent genotype/haplotype among patients with CML was TGF-β1TG/TG (at codon 10G/G and codon 25G/G), which correlates with high gene expression, followed by IFN-γA/T (at intron 1, +874A/T), which correlates with intermediate gene expression, and IL-10 ACC/ACC (−1082A/A, −819C/C, −592C/C) and ATA/ATA (−1082A/A, −819T/T, −592A/A), both of which correlate with low gene expression. This evidence concerns the gene IL10 and chronic myelogenous leukemia, BCR-ABL1 positive.