Scatter plots showing individual trough serum romiplostim concentration versus romiplostim dose in romiplostim-treated patients. (A) Serum romiplostim concentration versus dose before administration of romiplostim at weeks 13, 14, 15, and 16 during the pharmacokinetics assessment period and (B) 2 days after dosing at each week during the pharmacokinetics assessment period. The data showed no correlation of dose with concentration.