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  • Title: Is cytarabine useful in the treatment of acute promyelocytic leukemia? Results of a randomized trial from the European Acute Promyelocytic Leukemia Group.
    Author: Adès L, Chevret S, Raffoux E, de Botton S, Guerci A, Pigneux A, Stoppa AM, Lamy T, Rigal-Huguet F, Vekhoff A, Meyer-Monard S, Maloisel F, Deconinck E, Ferrant A, Thomas X, Fegueux N, Chomienne C, Dombret H, Degos L, Fenaux P, European Acute Promyelocytic Leukemia Group.
    Journal: J Clin Oncol; 2006 Dec 20; 24(36):5703-10. PubMed ID: 17116939.
    Abstract:
    PURPOSE: Several phase II studies have suggested that cytarabine (AraC) was not required in the treatment of newly diagnosed acute promyelocytic leukemia (APL) patients receiving all-trans-retinoic acid (ATRA), an anthracycline, and maintenance therapy, and we aimed at confirming this finding in a randomized trial. PATIENTS AND METHODS: Newly diagnosed APL patients younger than age 60 years with a WBC count of less than 10,000/microL were randomly assigned to receive either ATRA combined with and followed by three daunorubicin (DNR) plus AraC courses and a 2-year maintenance regimen (AraC group) or the same treatment but without AraC (no AraC group). Patients older than age 60 years and patients with initial WBC count of more than 10,000/microL were not randomly assigned but received risk-adapted treatment, with higher dose of AraC and CNS prophylaxis in patients with WBC counts more than 10,000/microL. RESULTS: Overall, 328 (96.5%) of 340 patients achieved complete remission (CR). In the AraC and the no AraC groups, the CR rates were 99% and 94% (P = .12), the 2-year cumulative incidence of relapse (CIR) rates were 4.7% and 15.9% (P = .011), the event-free survival (EFS) rates were 93.3% and 77.2% (P = .0021), and survival rates were 97.9% and 89.6% (P = .0066), respectively. In patients younger than age 60 years with WBC counts more than 10,000/microL, the CR, 2-year CIR, EFS, and survival rates were 97.3%, 2.9%, 89%, and 91.9%, respectively. CONCLUSION: These results support a role for AraC in addition to ATRA and anthracyclines in the treatment of newly diagnosed APL, at least using DNR at the cumulative dose we used and with the consolidation and maintenance regimens we used.
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