DFS according to cytogenetic risk groups. (A) Final tree by TSSA after pruning. Internal leaves are shown by ovals and terminal leaves by rectangles. The numbers inside each internal and terminal leaf represent the number of patients suffering relapse or death out of the total number of patients at risk. ^*Proportion of patients suffering relapse or death. (B) DFS curves comparing cytogenetic risk groups identified by TSSA. (C) DFS curves comparing patients with normal karyotype with patients who have an abnormal karyotype with fewer than 5 abnormalities.