A Study of Immune Suppression Treatment for People With Sickle Cell Disease or β-Thalassemia Who Are Going to Receive an Allogeneic Hematopoietic Cell Transplantation (HCT)

Memorial Sloan Kettering at Basking Ridge (Consent only), Basking Ridge, New Jersey, United States

Memorial Sloan Kettering Monmouth (Consent only), Middletown, New Jersey, United States

Memorial Sloan Kettering Bergen (Consent only), Montvale, New Jersey, United States

Memorial Sloan Kettering Suffolk - Commack (Consent only), Commack, New York, United States

Memorial Sloan Kettering Westchester (Consent only), Harrison, New York, United States

Memorial Sloan Kettering Nassau (All protocol activities), Rockville Centre, New York, United States