TREC levels in a cohort of prospectively evaluated pediatric patients undergoing CBC transplantation.

Individual CD4⁺ (●) and CD8⁺ (○) T-cell TREC levels are shown for patients at time points after undergoing CBC transplantation. Normal TREC levels for age are shown by the dashed line. Duration of immunosuppressive therapy is shown for cyclosporine (C), methylprednisolone (M), and ATG (A). Recorded instances of active GVHD (+) and no active GVHD (−) are also shown. The patients are identified by a letter followed by their age, and whether they had related CBC (RCB) or unrelated CBC (UCB) in the upper right of each plot. Patients E2, F7, and I8 all had increases in TREC levels while on immunosuppression.