- Determine whether the 4-year post-relapse survival after intensive VP-16, CTX, and CBDCA is at least 40% higher in patients with relapsed Wilm's tumor previously treated with Regimen DD-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.