Pharmacogenetic screening of the selected 24 SLC22A1 tag-SNPs, as well as candidate SNPs from ABCB1 [1236C>T (rs1128503), 2677G>T/A (rs2032582), 3435C>T (rs1045642)], ABCG2 421C>A (rs2231142), CYP3A5*3 (rs776746) and PXR [IVS2+55A>G (rs1464603), IVS2+78A>G (rs1464602), IVS6-17C>T (rs2276707), 1792A>G (rs3732359), 1944T>C (rs3732360), 2654T>C (rs3814058)] was performed in 38 CML patients. This evidence concerns the gene ABCG2 and chronic myelogenous leukemia, BCR-ABL1 positive.