Safety and Efficacy Study of Sotatercept in Adults With Transfusion Dependent Diamond Blackfan Anemia

"Cohort 4a: 3 patients on Sotatercept 0.75 mg/kg every 3 weeks. If the patients have no untoward events in the Patients in Dose Level 4 by the end of 3 of the 6 doses, then additional patients (Dose Level 5) will be enrolled at the next dose level:~Cohort 5a: 3 patients on Sotatercept 1 mg/kg every 3 weeks"

"Cohort 4b: 3 patients on Sotatercept 0.75 mg/kg every 3 weeks with a three week prednisone boost of 1 mg/kg/day (max 60 mg). If the patients have no untoward events in the Patients in Dose Level 4 by the end of 3 of the 6 doses, then additional patients (Dose Level 5) will be enrolled at the next dose level:~Cohort 5b: 3 patients on Sotatercept 1 mg/kg every 3 weeks with a 3 week prednisone boost of 1 mg/kg/day (max 60 mg)."