EFS rates according to randomization arm in the 2 response groups. In the CR group, the estimated 3-year EFS rates were 79.8% (95% CI, 69.3%-91.9%) in the ASCT arm and 35.4% (95% CI, 23.9%-52.4%) in the observation arm (P < .00001). In the non-CR group, the corresponding rates were 48.9% (95% CI, 35.3%-67.7%) in the ASCT arm and 44.4% (95% CI, 31.8%-62.2%) in the FC arm (P = .55); no evidence against the proportionality hazard assumption was found in either group (P = .50 and P = .63, respectively).