MPO and acute lymphoblastic leukemia: Comparing the standard risk-stratification factors in ALL (Hafiz et al., 2008; Terwilliger and Abdul-Hay, 2017), between the MPO+ve and MPO-ve cases, this work revealed no significant differences among MPO+ve and -ve patients in regard to age, B-symptoms, extramedullary disease, blood cell counts including the WBC, neutrophil and blast cell counts, HB, ESR, uric acid, creatinine and LDH mean values.