RecruitingPhase 2Drug trialLuspatercept + Darbepoetin in MDSThis is a single arm open-label Phase II trial of luspatercept and darbepoetin alfa in non-mutated SF3B1 , lower-risk, RBC transfusion dependent MDS participants with an endogenous erythropoietin (EPO) level \< 500 IU/L.