DeZern AE, Eapen M, Wu J, et al. Haploidentical bone marrow transplantation in patients with relapsed or refractory severe aplastic anaemia in the USA (BMT CTN 1502): a multicentre, single-arm, phase 2 trial. Lancet Haematol 2022; published online July 27. https://doi.org/10.1016/S2352-3026(22)00206-X—In this Article, in the Summary, the unit of dose of fludarabine should have been mg/m2. This correction has been made to the online version as of Aug 1, 2022.