A girl with sickle cell anemia was treated with cord blood transplantation combined with hematopoietic growth factor. Cord blood cells were collected from a sister with an identical human leukocyte antigen complex who was a carrier of the sickle cell trait (hemoglobin AS). The patient had complete engraftment and no graft-versus-host disease. The persistence of a high level of fetal hemoglobin 6 months after engraftment was noted.
Brichard, B., Vermylen, C., Ninane, J., & Cornu, G. (1996). Persistence of fetal hemoglobin production after successful transplantation of cord blood stem cells in a patient with sickle cell anemia. The Journal of Pediatrics, 128(2), 241-243. https://doi.org/10.1016/S0022-3476(96)70398-0 (Original work published 1996)