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Acute myeloid leukemia

Molecular remission as a therapeutic objective in acute promyelocytic leukemia

Leukemiavolume 32pages16711678 (2018) | Download Citation


Acute promyelocytic leukemia (APL) is a subtype of acute leukemia characterized by a unique t(15;17) translocation generating the PML/RARA fusion gene and hybrid oncoprotein. Besides its critical role in leukemogenesis, this genetic aberration serves as a disease-specific biomarker for rapid diagnosis and monitoring of minimal residual disease (MRD). Moreover, PML/RARA is specifically targeted by All-trans retinoic acid (ATRA) and arsenic trioxide (ATO), two agents that synergistically act to induce degradation of the oncoprotein. Large clinical studies including two randomized trials conducted in newly diagnosed APL patients have shown that the ATRA–ATO combination is superior to conventional ATRA and chemotherapy both in terms of efficacy and safety. Preliminary studies using oral formulations of arsenic and ATRA suggest that oral arsenic is as effective and manageable as intravenous ATO. Following early retrospective studies indicating the prognostic relevance of PML/RARA monitoring, several prospective studies were conducted in large cohorts of APL patients enrolled in clinical trials with the aim of better assessing the prognostic value of longitudinal PCR testing. The results consistently showed that molecular remission (defined as negativization of the PCR test for PML/RARA) correlates with a significantly decreased risk of relapse, whereas persistence of PCR positivity for PML/RARA after consolidation or conversion from negative to positive during follow-up is strongly associated with hematologic relapse. Based on these data, various groups started using pre-emptive salvage therapy for patients who persisted PCR-positive after frontline consolidation or converted from negative to positive PCR during follow-up. Finally, several expert panels have recommended that molecular remission should be considered a therapeutic objective in APL, and molecular response has been adopted as a study endpoint in modern clinical trials.

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Author information


  1. Department of Biomedicine and Prevention, University Tor Vergata, Rome, Italy

    • Laura Cicconi
    •  & Francesco Lo-Coco
  2. Hospital St Louis, Paris 7 University, Paris, France

    • Pierre Fenaux
  3. Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

    • Hagop Kantarjian
  4. Leukemia Service, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA

    • Martin Tallman
  5. Hospital Universitario la Fe, Hematology Department, Department of Medicine, University of Valencia, Valencia, Spain

    • Miguel A. Sanz


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The authors declare that they have no conflict of interest.

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Correspondence to Francesco Lo-Coco.

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