Kaplan-Meier curve showing overall survival in relation to donor source after hematopoietic stem cell transplantation and gene therapy. HAPLO, haploid-identical T-cell–depleted donor; MFD, matched family donor; MMUD, mismatched unrelated donor; MSD, matched sibling donor; MUD, matched unrelated donor. Professional illustration by Somersault 18:24, adapted from Cicalese et al¹  and Hassan et al.⁹