The association between GSTP1 Ile105Val, GSTM1 and GSTT1 polymorphisms in the susceptibility to CML was investigated by different studies, but with conflicting results (Banescu et al., 2014; Lordelo et al., 2012; Al-Achkar et al., 2014; Lourenco et al., 2005; Weich et al., 2016; Hishida et al., 2005; Bhat et al., 2012). The gene discussed is GSTM1; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.