An Efficacy and Safety Study of Luspatercept (ACE-536) for the Treatment of Anemia Due to IPSS-R Very Low, Low or Intermediate Risk Myelodysplastic Syndromes (MDS) in Japanese Subjects Who Are Not Requiring Red Blood Cell Transfusion

The study will be conducted in compliance with the International Council for Harmonisation (ICH) of Technical Requirements for Registration of Pharmaceuticals for Human Use/Good Clinical Practice (GCP) and applicable regulatory requirements. This is a Phase 2, multicenter, single-arm study to evaluate the efficacy, safety and Pharmacokinetics (PK) of luspatercept (ACE-536) for the treatment of anemia due to International prognostic scoring system-Revised (IPSS-R) very low, low or intermediate risk Myelodysplastic syndromes (MDS)in Japanese subjects who are not requiring Red blood cell (RBC) transfusion. The study is divided into the Screening Period, a Treatment Period and a Post-Treatment Follow up Period.