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An update on classification, genetics, and clinical approach to mixed phenotype acute leukemia (MPAL)

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Abstract

Mixed phenotype acute leukemia (MPAL) is an uncommon diagnosis, representing only about 2–5% of acute leukemia cases. The blast cells of MPAL express multilineage immunophenotypic markers and may have a shared B/T/myeloid phenotype. Due to historical ambiguity in the diagnosis of MPAL, the genetics and clinical features of this disease remain poorly characterized. Based on the 2008 and 2016 World Health Organization classifications, myeloid lineage is best determined by presence of myeloperoxidase, while B and T lymphoid lineages are demonstrated by CD19 and cytoplasmic CD3 expression. MPAL typically carries a worse prognosis than either acute myeloid leukemia (AML) or acute lymphoid leukemia (ALL). Given the rarity of MPAL, there is a lack of prospective trial data to guide therapy; treatment generally relies on ALL-like regimens followed by consolidation chemotherapy or hematopoietic stem cell transplant (HSCT). Here, we review the updated classification, biology, clinical features, and treatment approach to MPAL.

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  1. Department of Leukemia, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 402, Houston, TX, 77030, USA

    Maliha Khan & Kiran Naqvi

  2. Department of Internal Medicine, Dow University of Health Sciences, Karachi, Pakistan

    Rabbia Siddiqi

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Khan, M., Siddiqi, R. & Naqvi, K. An update on classification, genetics, and clinical approach to mixed phenotype acute leukemia (MPAL). Ann Hematol 97, 945–953 (2018). https://doi.org/10.1007/s00277-018-3297-6

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