Probability of 4-year survival after relapse according to time of relapse and blast count on day 28. SE = standard error. Late relapse and BM day 28 ≤20% vs. late relapse and BM day 28>20%, P(logrank)=0.0004; late relapse and BM day 28 ≤20% vs. early relapse and BM day 28 ≤20%, P=0.05; late relapse and BM day 28 ≤20% vs. early relapse and BM day 28 >20%, P<0.0001; late relapse and BM day 28 >20% vs. early relapse and BM day 28 ≤20%, P=0.028; late relapse and BM 28 >20% vs. early relapse and BM day 28 >20%, P=0.022; early relapse and BM 28 ≤20% vs. early relapse and BM day 28 >20%, P<0.0001.