Evaluation of the dysmyelopoiesis in 336 patients with de novo acute myeloid leukemia: major importance of dysgranulopoiesis for remission and survival.

Myelodysplastic features and myeloperoxidase (MPO) deficiency have been investigated in a series of 336 cases of de novo acute myeloid leukemia (AML) to clarify their impact on the outcome of such patients and to compare with the previous results from the literature. Dysplastic features were defined according to the FAB criteria. Trilineage disease (TLD) was observed in 11.6% of patients (39 cases), and the complete remission rate (CR) was 56.4% for TLD patients compared to 74.4% for patients without any dysplastic features (p = 0.03). The effects of dysgranulopoiesis (DysM) alone or in combination were assessed using a logistic regression analysis. This analysis revealed that only DysG had any effect on CR rate (p = 0.013). The CR rate for patients with DysG was 56.6% and 71.5% for patients without DysG. We were unable to find any correlation between MPO deficiency, dysplastic features and CR rate. Cytogenetic analysis could be assessed for 119 patients. For patients with DysG, 10 karyotypes were normal and 20 were abnormal compared to 48 normal and 41 abnormal for patients without DysG (p = 0.05). We conclude that the presence of DysG in de novo AML exerts a negative effect on the ability to achieve a CR and is related to a higher frequency of cytogenetic abnormalities.