- Determine whether the 2-year second-event-free survival after intensive doxorubicin, etoposide (VP-16), cyclophosphamide (CTX), and carboplatin (CBDCA) plus radiotherapy to residual disease is at least 40% higher in patients with relapsed Wilm's tumor previously treated with Regimen EE-4A as initial therapy and without loss of heterozygosity for chromosomes 16q and 1p and increased DNA content in tumor cells than for similarly treated patients with loss of heterozygosity for chromosome 16q or 1p or increased DNA content in tumor cells.