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Improved Treatment Results in High-Risk Pediatric Acute Myeloid Leukemia Patients After Intensification With High-Dose Cytarabine and Mitoxantrone: Results of Study Acute Myeloid Leukemia–Berlin-Frankfurt-Münster 93

From the Department of Pediatric Hematology/Oncology, University Children’s Hospital, Münster, Jena, Cologne, Berlin, Hamburg, Essen, Giessen, and Magdeburg, Germany; St Anna Children’s Hospital, Vienna, Austria; and Department of Pediatric Hematology/Oncology, University Children’s Hospital, Zurich, Switzerland.

Address reprint requests to Ursula Creutzig, Prof, Klinik und Poliklinik für Kinderheilkunde, Pädiatrische Hämatologie/Onkologie, Albert-Schweitzer-Str 33, D-48129 Münster, Germany; email: ucreutzig@ aol.com.

PURPOSE: To improve outcome in high-risk patients, high-dose cytarabine and mitoxantrone (HAM) was introduced into the treatment of children with acute myelogenous leukemia (AML) in study AML-BFM 93. Patients were randomized to HAM as either the second or third therapy block, for the purpose of evaluation of efficacy and toxicity.

PATIENTS AND METHODS: A total of 471 children with de novo AML were entered onto the trial; 161 were at standard risk and 310 were at high risk. After the randomized induction (daunorubicin v idarubicin), further therapy, with the exception of HAM, was identical in the two risk groups and also comparable to that in study Acute Myeloid Leukemia–Berlin-Frankfurt-Münster (AML-BFM) 87.

RESULTS: Overall, 387 (82%) of 471 patients achieved complete remission, and 5-year survival, event-free survival (EFS), and disease-free survival rates were 60%, 51%, and 62%, respectively. Idarubicin induction resulted in a significantly better blast cell reduction in the bone marrow on day 15. Estimated survival and probability of EFS were superior in study AML-BFM 93 compared with study AML-BFM 87 (P = .01, log-rank test). This improvement, however, was restricted to the 310 high-risk patients (remission rate and probability of 5-year EFS in study AML-BFM 93 v study AML-BFM 87: 78% v 68%, P = .007; and 44% v 31%, P = .01, log-rank test). Probability of 5-year EFS among standard-risk patients in study AML-BFM 93 was similar to that in study AML-BFM 87 (65% v 63%, P = not significant). Whether HAM was placed as the second or third therapy block was of minor importance. However, patients who received the less intensive daunorubicin treatment during induction benefited from early HAM.

CONCLUSION: Improved treatment results in children with high-risk AML in study AML-BFM 93 must be attributed mainly to the introduction of HAM.

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