Abstract
Introduction.
The vast majority of AML clinical trials incorporate high-dose ARA-C (HDARA-C) as a basic approach. Though it was recently proved by a controlled prospective comparison that different treatment strategies in patients with AML did not show clinically relevant outcome differences (Th.Buchner, JCO, 2012), the RALSG initiated a randomized multicenter AML-10 trial (ClinicalTrials.gov Identifier: NCT01587430) aiming to evaluate the necessity of HDARA-C in consolidation in the context of high total dose of different anthracyclines/anthracenedione (660-720 mg/m2).
Materials and methods.
The patients aged 16-60 yy with de novo AML (except APL) were randomized before treatment start to different types of consolidation after two induction 7+3 with daunorubicin 60 mg/m2x3 and ARA-C 100 mg/m2 bid iv (1-7d) in the 1st course and 200 mg/m2/d (1-7d) continuous infusion in the 2nd course: (1st arm) two courses of 7+3 with Idarubicin (Ida) 12 mg/m2x3 and with Mitoxantrone (Mito) 10 mg/m2x3, in both ARA-C 100 mg/m2 bid iv (1-7d); (2nd arm) two courses of HDARA-C 1g/m2 bid iv 1-3 days with Ida 8 mg/m2 3-5 days and Mito10 mg/m2 3-5 days. After consolidation all pts proceeded to the maintenance 5+5 courses (ARA-C 100 mg/m2 bid iv 1-5 days with 6-mercaptopurine 50 mg/m2 1-5 days). Allogeneic HSCT was indicated to patients from intermediate and poor cytogenetic risk groups, late CR, WBC > 100*109/l.
Results.
From Jan 2010 till Jan 2014, 250 AML patients from 20 centers were randomized: (1st arm) 125 pts (m.age 45 y, 17-59 yy; 73f / 52m; LDH=674 IU (128-6653); cytogenetics favorable - 17,3%, intermediate - 66,7%, poor - 16%) and (2nd arm) 125 pts (m.age 43y, 16-60yy; 69f/56m; LDH=704 IU (123-8159); cytogenetics favorable - 20%, intermediate - 58,6%, poor - 21,4%). No molecular testing in cytogenetically normal pts was done. The analysis was performed in May 2014. The follow-up data were available in 199 pts.
CR was achieved in 72,9% (n=145), early death was registered in 12,7% (n=25) and refractory disease - in 12,4% (n=24). Death in CR did not differed in a randomized groups (1st) 13,9% and (2nd) 13,7%. 17% of CR pts (n=20) were withdrawn from the protocol due to refusals (3,5%), infectious complications (13,5%). No relevant cardiotoxicity was registered on both arms. 12% (8 pts on the 1st arm, 9 - on the 2nd) were transplanted in 1st CR from HLA-identical donors.
3-years OS and DFS by intent-to-treat analysis were identical on both arms: (1st arm) 43% and 62%, (2nd arm) - 38% and 51%, respectively. For those patients in whom consolidation was fulfilled the comparison of DFS in different cytogenetic groups demonstrated equal efficacy of each consolidation arm: favorable - 85% (1st) and 85% (2nd), intermediate -65% (1st) and 57% (2nd), poor - 20% (1st) and 22% (2nd). In a multivariate analysis only cytogenetic group (HR=3,01, p=0,005) and CR achievement after the 2nd induction course (HR=2,83, p=0,0007) adversely influenced DFS. As the land-mark (5 mo of CR) analysis have shown, the bad prognosis of late CR could be modified by allo-HSCT in 1st CR: DFS of transplanted patients = 86%, non-transplanted=27% (p=0,03).
Conclusion.
Our interim analysis has demonstrated that conventional 7+3 consolidation is equal in long-term outcome to high dose ARA-C in case of the high total doses of different anthracyclines/ anthracenedione in induction/consolidation. CR after the 2nd induction became independent adverse prognostic factor (even inside cytogenetic risk groups) defining patients who should be transplanted in 1st CR.
No relevant conflicts of interest to declare.
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