The frequencies of CYP1A1 Ile/Ile(A4889A), Ile/Val (A4889G), and Val/Val (G4889G)genotypes were 38, 57, and 5% in CML patients and16, 78, and 6% in controls respectively. Here, CYP1A1 is linked to chronic myelogenous leukemia, BCR-ABL1 positive.