Cumulative incidence of relapse by IPSS score. (A) The cumulative incidences of relapse for low, intermediate-1, intermediate-2, and high IPSS groups are given at the right margin. (B) Cumulative incidence of relapse within the intermediate-1 (B) and within the intermediate-2 (C) IPSS risk group by flow score. Differences were significant for the intermediate-1 risk group (P < .01), but not for the intermediate-2 group.