Survival (A) and freedom from AML evolution (B) of MDS patients related to their risk-based categorical cytogenetic subgroups: Good, Intermediate, and Poor. Good, normal, del(5q) only, del(20q) only, −Y only; Poor, complex (ie, ≥3 anomalies) or chromosome 7 abnormalities; Intermediate, other abnormalities (Kaplan-Meier curves).