Platelet parameters in responders to eltrombopag treatment. (A) Platelet count, (B) mean platelet volume (MPV), (C) immature platelet fraction (IPF) %, and (D) absolute immature platelet fraction (AIPF). Responders (black columns) and nonresponders (gray columns). Data are mean ± SEM (*P < .05; **P < .02; ***P < .001).