Overall survival of patients included in the analysis. (A) Overall survival of the International MDS Risk Assessment Workshop patients who did not undergo stem cell transplantation, stratified by IPSS score at the time of diagnosis (P < .001 for differences in risk groups). (B) Overall survival of the IBMTR/FHCRC bone marrow transplantation cohort of patients, stratified by IPSS risk score at the time of transplantation (P < .001 for differences in risk groups).