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Multiple studies have documented an increased risk of secondary malignancies in patients receiving alkylating agents. Secondary leukemia following chemotherapy accounts for about 20% of all secondary neoplasms; most are acute nonlymphocytic. Secondary acute lymphoblastic leukemia has rarely been reported in either adult or childhood cancer. We report the development of acute T-cell lymphoblastic leukemia in a child following successful treatment of a paravertebral embryonal rhabdomyosarcoma (ERS). Southern blot analysis of DNA extracted from the T-cell lymphoblasts, using probes homologous to loci on the short arm of chromosome 11; P-calcitonin, P40.1 and H-ras, did not demonstrate the chromosomal loss of heterozygosity (LOH), a common feature of embryonal rhabdomyosarcoma. The data presented support the assumption that de novo leukemia emerged following treatment of the primary malignancy.
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