Reinduction platform for children with first marrow relapse of acute lymphoblastic Leukemia: A Children's Oncology Group Study[corrected].

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
Elizabeth RaetzWilliam L Carroll

Abstract

Treatment of childhood relapsed acute lymphoblastic leukemia (ALL) remains a significant challenge. The goal of the Children's Oncology Group (COG) AALL01P2 study was to develop a safe and active chemotherapy reinduction platform, which could be used to evaluate novel agents in future trials. One hundred twenty-four patients with ALL and first marrow relapse received three, 35-day blocks of reinduction chemotherapy: 69 with early relapse (ER; < 36 months from initial diagnosis) and 55 with late relapse (LR). Minimal residual disease (MRD) was measured by flow cytometry after each treatment block. Second complete remission (CR2) rates at the end of block 1 in 117 assessable patients were 68% +/- 6% for ER (n = 63) and 96% +/- 3% for LR (n = 54; P < .0001). Five of seven patients with T-cell ALL (T-ALL) failed to achieve CR2. Among patients in CR2, MRD greater than 0.01% was detected at the end of block 1 in 75% +/- 7% of ER (n = 36) versus 51% +/- 8% of LR (n = 43; P = .0375) and 12-month event-free survival was 80% +/- 7% versus 58% +/- 7% in MRD-negative versus positive patients (P < .0005). Blocks 2 and 3 of therapy resulted in reduction of MRD burden in 40 of 56 patients who were MRD positive after block 1. Toxicity was acce...Continue Reading

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Citations

May 15, 2010·Current Hematologic Malignancy Reports·Dario Campana
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Mar 1, 2012·Current Hematologic Malignancy Reports·Dario Campana
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