mesna and Rhabdomyosarcoma--Alveolar

Peripheral blood stem cell support allows dose intensification of multiple cycle chemotherapy for metastatic tumors, including pediatric sarcomas. The VACIME protocol (vincristine, adriamycin, cyclophosphamide, ifosfamide, mesna and etoposide) utilizes peripheral blood stem cells (PBSC) collected following the treatment cycle as support for subsequent dose- and time-intensive chemotherapy. A critical assumption is that PBSC collected in this manner will be purged of residual tumor cells in vivo. We tested this assumption using sensitive reverse-transcriptase polymerase chain reaction (RT-PCR) to assess the presence of the characteristic translocations of the Ewing's sarcoma family of tumors (ESFT) and alveolar rhabdomyosarcoma (ARMS), t(11;22), and t(2;13), respectively. We used RT-PCR to evaluate 122 samples of peripheral blood (PB), bone marrow (BM) and PBSC collected from 12 pediatric patients with metastatic ESFT and ARMS. The samples included pre-therapy BM and PB, as well as BM, PB, and PBSC collections at various times in the VACIME treatment course. Molecular evidence of tumor contamination was detected in 1/40 PBSC collections from 12 patients. In all patients, we documented clearance of disease by RT-PCR in peripheral blood and bone marrow by week 9 of the VACIME protocol. In vivo purging in combination with the intensive VACIME regime appears to be effective in removing tumor cells from PBSC, bone marrow, and peripheral blood as detected by RT-PCR.

Topics: Adolescent; Antineoplastic Combined Chemotherapy Protocols; Bone Marrow; Bone Marrow Purging; Bone Neoplasms; Child; Chromosomes, Human, Pair 11; Chromosomes, Human, Pair 13; Chromosomes, Human, Pair 2; Chromosomes, Human, Pair 22; Combined Modality Therapy; Cyclophosphamide; DNA-Binding Proteins; Doxorubicin; Etoposide; Female; Forkhead Box Protein O1; Forkhead Transcription Factors; Hematopoietic Stem Cell Transplantation; Hematopoietic Stem Cells; Humans; Ifosfamide; Male; Mesna; Neoplasm Proteins; Neoplastic Cells, Circulating; Oncogene Proteins, Fusion; Paired Box Transcription Factors; PAX3 Transcription Factor; Proto-Oncogene Protein c-fli-1; Reverse Transcriptase Polymerase Chain Reaction; Rhabdomyosarcoma, Alveolar; RNA-Binding Protein EWS; Sarcoma, Ewing; Sensitivity and Specificity; Soft Tissue Neoplasms; Transcription Factors; Translocation, Genetic; Vincristine