No association was observed between the laboratory parameters (blast, basophils, and WBC count) and the CAT C262T, GPX1 Pro198Leu, MnSOD Ala16Val, GSTM1, GSTT1, and GSTP1 variant genotypes in CML cases. This evidence concerns the gene GSTP1 and chronic myelogenous leukemia, BCR-ABL1 positive.