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Prepublished online as a Blood First Edition Paper on May 13, 2002; DOI 10.1182/blood-2002-03-0776.
Submitted March 14, 2002
Leukaemia Unit, Royal Marsden Hospital, Sutton, Surrey, United Kingdom * Corresponding author; email: j-mehta{at}northwestern.edu.
Extending the principle of conventional acute lymphoblastic leukemia (ALL) therapy to transplantation, 77 adult patients autografted in first remission after melphalan ± total body irradiation were scheduled to receive 6-mercaptopurine (6MP), methotrexate (MTX) and vincristine-prednisone (VP) for 2 years post-transplant to reduce relapse. 71% of patients received 6MP, 57% received MTX and 38% received VP. 30 patients relapsed at 1.5-80 months (median 12.5); 15 in the first year and 7 beyond 3 years. The cumulative incidence of relapse at 10 years was 42% (95% CI: 31-55). The 10-year probabilities of disease-free (DFS) and overall (OS) survival were 50% (95% CI: 38-62) and 53% (95% CI: 41-65) respectively. Age >30 years, >4 weeks to attain remission and high-risk karyotypes [t(9;22) or t(4;11)] were adverse features contributing to the identification of 3 prognostic risk groups with 0, 1, and 2 adverse features respectively: standard (47%), intermediate (36%), and high (17%). The 10-year cumulative incidences of relapse (20%, 48%, 85%; P<0.0001) and probabilities of disease-free survival (72%, 41%, 10%; P=0.0003) were significantly different amongst these groups. In Cox analysis of the 71 patients alive and well 120 days post-transplant, those receiving 2 or 3 maintenance chemotherapy agents had significantly lower relapse and superior DFS compared with those receiving 0 or 1 agent. Our data suggest that maintenance chemotherapy improves the outcome of autografted ALL patients. However, it is unlikely that autograft-based strategies are optimal for the high-risk group of patients who should be considered for alternative-donor allograft procedures.
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