High-dose thiotepa with autologous bone marrow rescue in pediatric solid tumors.

High-dose thiotepa was given as a single agent at a total dose of 1125 mg/m2 with autologous bone marrow rescue to nine patients with recurrent/refractory/poor risk pediatric malignancies (primitive neuroepithelial tumor (PNET), two; neuroblastoma, one; Wilms' tumor, one; osteosarcoma, one; Ewing's sarcoma one, Hodgkin's disease one, high-grade glioma, two). The response rate in these heavily pretreated patients was 71% (five out of seven evaluable patients) including two complete responses (Wilms', glioma), three partial responses (osteosarcoma, Ewing's sarcoma, Hodgkin's disease), and two with stable disease (PNET, glioma). The median duration of response was 2.5 months. The extramedullary toxicity was acceptable with symptoms mainly of skin and gastrointestinal tract. The data indicate that high-dose thiotepa is effective in several types of recurrent pediatric solid tumors, and merits further evaluation in combination regimens.