CLINICAL TRIAL
JOURNAL ARTICLE
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High dose alkylator therapy for extracranial malignant rhabdoid tumors in children.

BACKGROUND: Extracranial malignant rhabdoid tumor (MRT) is a rare pediatric cancer with a poor prognosis. The kidney is the most common site. Isolated reports have shown improvements in patient survival, but no specific treatment regimen has shown efficacy over others.

PROCEDURE: Retrospective review of patients diagnosed with extracranial MRT at Children's Hospital Los Angeles between 1983 and 2012.

RESULTS: The median age at presentation for the 21 patients was 13 months (range, 0-108 months). Ten patients had renal primary tumors. The median time to progression was 4 months (range, 0.4-7 months). The 5-year event free survival (EFS) and overall survival (OS) of the entire cohort was 38 ± 10.6%. After 2002, patients diagnosed with extracranial MRT were administered a chemotherapy regimen of vincristine, doxorubicin and high dose cyclophosphamide (VDC). The OS for the patients diagnosed before and after 2002 were 20 ± 12% and 54 ± 15%, respectively. Of the 13 patients who received VDC containing regimen, eight patients achieved a complete radiological remission; five of these patients are long-term survivors. Four patients who received autologous bone marrow transplantation were alive at last follow-up. All patients with unresectable primary tumors died. Patients who had disease progression or relapse did not survive.

CONCLUSIONS: Patients with extracranial MRT have a poor prognosis. Treatment with high dose alkylator therapy followed by consolidation with high dose chemotherapy and autologous bone marrow transplant for those patients in radiographic complete remission appears to have a beneficial effect on survival.

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