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Classification of Acute Myeloid Leukemias

Immunological classification of acute myeloblastic leukemias: relevance to patient outcome

Leukemia volume 17, pages 515–527 (2003)Cite this article

Abstract

Immunophenotyping is a major tool to assign acute leukemia blast cells to the myeloid lineage. However, because of the large heterogeneity of myeloid-related lineages, no clinically relevant immunological classification of acute myeloblastic leukemia (AML) has been devised so far. To attempt at formulating such a classification, we analyzed the pattern of expression of selected antigens, on blast cells collected at AML diagnosis. Patients were eligible if they had a first diagnosis of de novo AML and a sufficient number of blast cells for proper immunophenotyping. The relative expression of CD7, CD13, CD14, CD15, CD33, CD34, CD35, CD36, CD65, CD117, and HLA-DR were analyzed by cytometry in a test series of 176 consecutive AML cases. Statistical tools of clusterization allowed to remove antigens with overlapping distribution, leading us to propose an AML classification that was validated in a second AML cohort of 733 patients. We identified five AML subsets (MA to ME) based on the expression of seven antigens within four groups (CD13/CD33/CD117, CD7, CD35/CD36, CD15).-MA and MB-AML have exclusively myeloid features with seldom extramedullary disease and rare expression of lymphoid antigens. No cases of acute promyelocytic leukemia (APL) were observed within MB AML. MC AML have either myeloid or erythroblastic features. MD AML have more frequently high WBC counts than other subsets, which were related to the expression of CD35/CD36 and CD14 and to monoblastic differentiation. ME AML lack CD13, CD33, and CD117 but display signs of terminal myeloid differentiation. Specific independent prognostic factors were related to poor overall survival in each immunological subset: CD34+ (P<3 × 10−4) in MA AML, CD7+ in MB AML, non-APL cases (P<0.03) in MC AML, CD34+ (P<0.002) and CD14+ (P<0.03) in MD AML, CD14+ in ME AML (P<0.01). The inclusion of seven key markers in the immunophenotyping of AML allows a stratification into clinically relevant subsets with individual prognostic factors, which should be considered to define high-risk AML populations.

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Author information

Authors and Affiliations

  1. Hématologie Clinique, CHU Dijon, France

    R O Casasnovas, F K Slimane & M Maynadié

  2. Laboratoire d'hématologie, CHU Nantes, France

    R Garand

  3. Laboratoire d'immunologie, CHU Nancy, France

    G C Faure & M C Béné

  4. Laboratoire d'hématologie, CHU St-Etienne, France

    L Campos

  5. Laboratoire d'hématologie, Université Catholique de Louvain, Belgium

    V Deneys

  6. Laboratoire d'hématologie, Institut J. Bordet Bruxelles, Belgium

    M Bernier

  7. Laboratoire d'hématologie, CHU Strasbourg, France

    A Falkenrodt

  8. Laboratoire d'hématologie, CHU Brest, France

    G Lecalvez

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  1. R O Casasnovas
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This work was supported by a grant from the CHU of Dijon and by the GOELAMS

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Casasnovas, R., Slimane, F., Garand, R. et al. Immunological classification of acute myeloblastic leukemias: relevance to patient outcome. Leukemia 17, 515–527 (2003). https://doi.org/10.1038/sj.leu.2402821

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