Survival (left) and freedom from AML evolution (right) of myelodysplastic syndrome (MDS) patients related to their classification by the International Prognostic Scoring System (IPSS) for MDS: Low, Int-1, Int-2, High (Kaplan-Meier curves). AML indicates acute myeloid leukemia.

Reprinted with permission from Greenberg P, Cox C, Le Beau MM, et al. International scoring system for evaluating prognosis in myelodysplastic syndromes. Blood. 1997;89:2079-2088.