Probability of CCR for pro-B ALL patients treated in GMALL studies 03/87 and 04/89 according to the results of the cytogenetic and molecular analyses. Seventeen patients with a t(4;11) and/or MLL-AF-4 fusion transcripts (0.40; median, 576 days) and 11 patients with a normal karyotype or with other cytogenetic abnormalities (0.45; median, 1,906 days). P (log-rank) = .46.