- Stratum 9 (stages I-IV rhabdoid tumor): After nephrectomy, patients receive carboplatin IV on days 1-2 and VP-16 IV over 1 hour (beginning after carboplatin infusion) on days 1-3 of weeks 0, 3, 9, 12, 18, and 21 and CTX IV over 1 hour on days 1-5 of weeks 6, 15, and 24. G-CSF is administered as in stratum 7. Patients also undergo radiotherapy. (The rhabdoid tumor stratum closed to accrual effective 07/13/2001.) After completion of chemotherapy, patients undergo second-look laparotomy and partial nephrectomy or wedge excision (if feasible). After second-look surgery, patients without persistent or residual disease resume chemotherapy.