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  • Title: Treatment of acute promyelocytic leukaemia.
    Author: Fenaux P, Chomienne C, Degos L.
    Journal: Best Pract Res Clin Haematol; 2001 Mar; 14(1):153-74. PubMed ID: 11355929.
    Abstract:
    We review improvements achieved in the treatment of acute promyelocytic leukaemia (APL) over the last ten years. The combination of all- trans retinoic acid (ATRA) and conventional anthracycline-ARA-C chemotherapy (CT) has clearly demonstrated its superiority over CT alone (in terms of relapse and survival) in newly diagnosed APL. Combination treatment probably also reduces the incidence of initial failures, and complete remission (CR) rates greater than 90% are now regularly reported in large multicentre trials. Some randomized studies strongly suggest than prolonged maintenance treatment (for 1 or 2 years) with ATRA and low dose CT, and possibly very early introduction of anthracycline CT during induction treatment (i.e. not after ATRA) may reduce the incidence of relapse. With those treatments, the risk of relapse appears to be only 10-15%, although it remains greater in patients who initially have white blood cell counts (often associated with variant M(3)morphology, short bcr(3)isoform etc.) and patients with residual disease detectable by RT-PCR at the end of consolidation courses.ATRA syndrome remains the major side effect of ATRA treatment. It occurs in 10-15% of patients and is currently fatal in at least 10% of them. Rapid onset of CT and/or high dose steroids should improve its outcome.A sizeable proportion of APL patients who relapse after ATRA and CT can be durably salvaged by the same treatment followed by allogeneic or autologous stem cell transplantation, provided the transplant (in the autologous setting) is RT-PCR negative. Arsenic trioxide can induce CR in most APL patients refractory to ATRA and CT. It acts mainly by inducing apoptosis of APL cells. A place for arsenic trioxide earlier in the treatment of APL must currently be more precisely defined. Another issue in the treatment of APL is reducing the toxicity of first line treatment without increasing the relapse risk. Preliminary findings suggest that this could be achieved by consolidation CT using an anthracycline alone, without cytarabine.
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