Repetitive high-dose use of alkylating agents given with topoisomerase-II inhibitors is strongly leukemogenic, even with modest cumulative doses of each drug. This finding is notable for the following reasons: (1) it undermines predictions that limited use of high-dose chemotherapy might be minimally leukemogenic, and (2) it contrasts strikingly with the previously reported low risk of t-AML following treatment of pediatric solid tumors with chemotherapy lacking the alkylator dose-intensity and prominence of etoposide that are hallmarks of current regimens.
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