Quantitative immune reconstitution in surviving subjects. Blood lymphocyte subsets were determined in a subcohort of patients treated at Memorial Sloan Kettering Cancer Center. Total lymphocyte reconstitution (A), CD3^–CD19⁺ B-cell reconstitution (B), CD3⁺CD4⁺ T-cell reconstitution (C), CD3⁺CD8⁺ T-cell reconstitution (D), and median of the CD4⁺/CD8⁺ T-cell ratio at 3, 6, and 12 months post-HCT (E). Measurements in panels A to D are organized according to approximate time of collection post-HCT.