Clearance of alemtuzumab over time. Alemtuzumab levels for each patient were plotted at days 7, 14, 21, and 28 after the transplant. Average alemtuzumab levels for patients who received Alem-TBI (solid line) or Pento-Cy-Alem-TBI (dashed line) are shown. Day 7 levels were significantly lower in the Alem-TBI group (p < 0.001), but less significant at the later time points, compared with the Pento-Cy-Alem-TBI group