CD19 and leukemia: A study of 94 paediatric patients with high-risk leukaemia who received CD3+/CD19+ and TCRαb+/CD19+ T-cell-depleted haploidentical grafts by Gonzalez-Vicent et al. demonstrated faster recovery of immune cells as well as lower NRM when using donors <40 years old (NRM: donor >40 years, 43%; donor <40 years, 13%; p = 0.006) (71).