RecruitingPhase 2Drug trialSickle Cell Disease Transplant Using a Nonmyeloablative Approach for Patients With Anti-donor Red Cell AntibodyThis multicenter prospective study seeks to determine if daratumumab given, prior to HLA-identical sibling donor transplantation using alemtuzumab, low dose total-body irradiation, and sirolimus, can prevent pure red blood cell aplasia with an acceptable safety profile in patients with anti-donor red blood cell antibodies, achieving an event-free survival similar to transplanted patients without such antibodies.